final

Question 1

For the child being pulled forward on the toboggan in the figure below, which of the following is true of the magnitude of the normal force exerted by the ground on the toboggan? it is
A) possibly greater or less than the total weight, depending on the size of the weight relative to the tension in the rope.
B) greater than the total weight
C) less than the total weight
D) equal to the total weight

Answer 1

C) less than the total weight

Question 2

2. If you press a book flat against a vertical wall with your hand, in what direction is the friction force exerted by the wall on the
   book?
   A) into the wall
   B) out from the wall
   C) upward
   D) downward

Answer 2

upward

Question 3

A crate is sitting in the center of a flatbed truck. As the truck accelerates to the east, the crate moves with it without sliding on the bed of the truck. In what direction is the friction force exerted by the bed of the truck on the crate?
A) There is no Ff, because the crate isnt sliding
B) to the west
C) to the east

Answer 3

C) to the east

Question 4

A crate remains stationary after it has been placed on a ramp inclined at an angle with the horizontal. Which of the following statements must be true about the magnitude of the friction force that acts on the crate?
A) In is at least equal to the weight of the crate
B) It is greater than the component of the gravitational force acting down the ramp
C) It is larger than the weight of the crate
D) It is equal to the component of the gravitational force acting down the ramp
E) it is equal to Us Fn

Answer 4

D) It is equal to the component of the gravitational force acting down the ramp

Question 5

If a fly collides with the windshield of a fast-moving bus, which object experiences an impact act force with a larger magnitude?

A) the same force is experienced by both
B) the bus
C) the fly

Answer 5

A) the same force is experienced by both

Question 6

Which of the following conditions for forces acting from outside of system does not have to be met in order for Newton’s First Law to apply?

A) The sum of the forces to the left on the system equals the sum of the forces to the right
B) the net force on the system is zero
C) the sum of the upward forces equals the sum of the downward forces
D) no forces can act on the system

Answer 6

D) no forces can act on the system

Question 7

You are helping your aunt move a piano on wheels from one room to another. When you push the piano horizontally, it moves at constant speed. What can you say about the piano?
A) Its is in static equilibrium
B) it is in dynamic equilibrium
C) it is in equilibrium because it does not experience a Ff
D) it is in not equilibrium

Answer 7

B) it is in dynamic equilibrium

Question 8

What quantity(ies) is (are) needed to describe a vector?

A) only Magnitude
B) only direction
C) both magnitude and direction
D) neither magnitude or direction

Answer 8

C) both magnitude and direction

Question 9

The net force on an object is the combination of all forces that act on it.
True/False

Answer 9

True

Question 10

Nellie Newton hangs suspended from the middle of a horizontal rod. The rod is tied to three identical, vertical ropes: one at each end and one in the middle. The tension in any one of the ropes

A) must be 1/3 of her weight
B) must be equal her weight
C) can vary from 0 N to twice her weight
D) can vary from 1/3 of her weight to her full weight

Answer 10

A) must be 1/3 of her weight

Question 11

A pair of forces (8N and 10N) that are each horizontal can have a resultant of?

A) 2N
B) 18 N
C) both of these values
D) neither of these values

Answer 11

C) both of these values

Question 12

The force characteristic of a rope or sting tied to an object is?
A) tension
B) weight
C) gravity
D) capable of pushing on the object
E) different in magnitude at the different ends of the string

Answer 12

A) tension

Question 13

3 Monkeys (identical Triplets) are sleeping in a raft that is at rest on a pond. the net force on the raft is?

A) equal to 3 x the weight of a single monkey
B) equal to zero
C) equal to 2 x the weight of a single monkey
D) equal to the weight of a single monkey
E) equal to the weight of the raft with no monkeys in its plus the weight of 3 monkeys

Answer 13

B) equal to zero

Question 14

Burl and Paul have combined weight of 1300n. the tensions in the supporting ropes that support the scaffold on which they stand add up to a total of 1800 N. the weight of the scaffold itself must be?

A) 400N
B) 500N
C) 600N
D) 1550N

Answer 14

B) 500N

Question 15

Nellie Newton hangs at rest by holding onto a horizontal bar. the bar is suspended from a pair of ropes. the tension in one of the two ropes?

A) is equal to her weight
B) is the same as the tension in the other rope
C) can vary from zero to her full weight

Answer 15

C) can vary from zero to her full weight

Question 16

Using the significant figure rules employed in our labs, the area of a rectangle 4.5 cm by 3.25 cm is correctly given by Which of the following?

A) 14.625
B) 14.63
C) 14.6
D) 15

Answer 16

D) 15

Question 17

When applying the equations of kinematics for an object moving in one dimension, which of the following must be true?

A. he velocity of the object must remain constant.
B. The velocity of the object must increase with time.
C. The position of the object must increase with time.
D. The acceleration of the object must remain constant.
E. he velocity of the object must always be in the same direction as it acceleration

Answer 17

D. The acceleration of the object must remain constant.

Question 18

A juggler throws fruit straight up in the air. After the fruit leaves their hand and while it is in the air, which statement is true?

A) The acceleration is constant for the entire motion
B) The velocity is constant for the entire motion
C) the magnitude of both the velocity and acceleration decrease on the way up and increase on the way down
D) the acceleration is constant for the entire motion except at the top where it is zero

Answer 18

A) The acceleration is constant for the entire motion

Question 19

At time t= 0 s an object is traveling to the right along the +x-axis at a speed of 10 m/s with a constant acceleration of -2.0 m/s?. Which statement is true?

A) the object will decrease speed, eventually coming to a complete stop
B) the object cannot have a negative acceleration and be moving to the right
C) the object will continue to move to the right, reducing speed but never coming to a complete stop
D) the object will decrease speed, momentarily stop, then increase speed while moving to the left.

Answer 19

D) the object will decrease speed, momentarily stop, then increase speed while moving to the left.

Question 20

A movie stunt driver on a motorcycle leaves horizontally off a cliff at 28.2 m/s. The instant before she lands three seconds Later the magnitudes of the horizontal and vertical components of her velocity are:

A) 28.2 m/s; 0
B) 28.2 m/s;29.4 m/s
C) 0;28.2 m/s
D) 57.6 m/s;29.4 m/s

Answer 20

B) 28.2 m/s;29.4 m/s

Question 21

Which statement is not valid for a projectile? (take up as positive and ignore air resistance)

A) The projectile has the same x-component of the velocity at any point on its path
B) the velocity at the highest point is zero
C) the acceleration of the projectile has a constant negative value
D) the y-component of the velocity of the projectile is zero at the highest point of the projectiles path

Answer 21

B) the velocity at the highest point is zero

Question 22

One ball is dropped vertically from a window. At the same instant, a second ball is thrown horizontally from the same window. Neglecting air resistance, which ball has greater speed at the ground level?

A) The dropped ball
B) the thrown ball
C) neither - they both have the same speed on impact
D) it depends on how fast the ball was thrown

Answer 22

B) the thrown ball

Question 22

1. A golf ball is hit with a golf club. What forces act on the ball as it moves through the air? Neglect any air resistance.

A) The force of the golf club acting on the ball.
B) The force of gravity acting on the ball.
C) the force of the ball moving through the air.
D) All of these
E) Both A and B.

Answer 22

B) The force of gravity acting on the ball.

Question 22

You are driving your car around Wake Tech’s traffic circle at a constant speed of 10.0 m/s. The radius of the circle is 20 m. As you go around and around, which of the following is true?

A) the acceleration is 200 m/s directed tangent to the circle.
B) The acceleration is 5 m/s directed toward the center of the circle.
C) The acceleration is 200 m/s directed away from the center of the circle.
D) The acceleration is 5 m/s directed away from the center of the circle.

Answer 22

B) The acceleration is 5 m/s directed toward the center of the circle.

Question 22

9. The rectangular coordinates of a point are (9,40, y) and the polar coordinates of this point are (r, -35.99). What is r?

A) 7.61
B) 5.5
C) 11.6
D) 6.8

Answer 22

C) 11.6

Question 23

The gravitational force exerted on an object that is on or near the surface of the earth, commonly referred to as the weight of the object?

A) equals the objects mass in kg
B) is a force that can vary in magnitude depending on where on earth the object is located
C) is not equal to the magnitude of the force exerted by the object on the earth
D) is a force that acts on the object only if its in contact with some part of the earth

Answer 23

B) is a force that can vary in magnitude depending on where on earth the object is located

Question 23

The tension force in a flexible string, rope, or cable:

A) Can point in one direction or the exact opposite direction, depending upon which body is isolated in a free-body
B) can either be a push or a pull
C) is not always parallel to the string, rope, or cable
D) in a tug of war will be greater in the direction of the team that is winning than in the direction of the team that is losing,

Answer 23

A) Can point in one direction or the exact opposite direction, depending upon which body is isolated in a free-body

Question 24

In drawing free-body diagrams, you should:

A) Include all the forces exerted on the isolated body by other objects and the forces the isolated body exerts on the other objects
B) include all the forces the isolated body exerts on other objects.
C) Include only forces that will accelerate the isolated body.
D) Include all the forces exerted on the isolated body by other

Answer 24

A) Include all the forces exerted on the isolated body by other objects and the forces the isolated body exerts on the other objects

Question 25

5. A 50 N crate sits on a horizontal floor where the coefficient of static friction between the crate and the floor is 0.50. A 20N force is applied to the crate and acts to the right. What is the resulting static friction force acting on the crate?

A) 20 N to the right
B) 20 N to the left
C) 25 N to the right
D) 25 N to the left

Answer 25

B) 20 N to the left

Question 26

6. A child has a ball on the end of a cord and whirls the ball in a vertical circle. Assuming that the speed of the ball is constant, when would the magnitude of the tension in the cord be the greatest?

A) at the top of the circle
B) at the bottom of the circle
C) A little after the bottom of the circle when the ball is climbing.
D) A little before the bottom of the circle when the ball is descending
E) the magnitude of the tension is constant at all points

Answer 26

B) at the bottom of the circle

Question 27

A car drives at steady speed around perfectly circular track.

A) The car’s acceleration is zero.
B) the net force on the car is zero
C) Both the acceleration and net force point outward
D) Both the acceleration and net force point inward

Answer 27

D) Both the acceleration and net force point inward

Question 28

Two constant forces of equal magnitude act on a mass as shown. The mass moves horizontally to the right a distance delta x. The net work done by the force as written as :

A) F delta x (1-cos30)
B) F delta x (1+ cos30)
C) 2 F delta x (1+cos(30)
D) 2 F delta x cos30

Answer 28

B) F delta x (1+ cos30)

Question 29

A student pushes a block up an incline at a constant speed. As the block moves up the incline its?

A) Kinetic-energy and potential energy both increase
B) Kinetic-energy increases and potential energy remains the same
C) potential-energy increases and Kinetic energy remains the same
D) potential-energy increases and Kinetic energy decreases by the same amount

Answer 29

C) potential-energy increases and Kinetic energy remains the same

Question 30

10. A satellite in circular orbit around the Earth moves at a constant speed. The orbit is maintained by the force of gravity between the Earth and the satellite, yet no work is done on the satellite. How is this possible?

A) no work is done if there is no contact between the objects
B) no work is done because there is no gravity in space
C) no work is done if the direction of the motion is perpendicular to the force
D) no work is done since it is not a horizontal or vertical circular motion

Answer 30

C) no work is done if the direction of the motion is perpendicular to the force

Question 31

11. When a skier glides down a snow-covered hill, the normal force exerted on the skier by the hill is

A) Equal to the weight of the skier
B) Greater than the weight of the skier
C) Less than the weight of the skier

Answer 31

C) Less than the weight of the skier

Question 32

12. A person does a wall sit squat exercise as shown in the picture. Suppose the person pushes on the wall with a horizontal force of 12 N. The static friction force exerted by the wall on the person is directed:

A) downward and is determined by Ff = Us * 12 N
B) upward and is determined by Ff < Us * 12 N
C) downward and is determined by Ff = Us * mg
D) upward and is determined by Ff < Us * mg

Answer 32

B) upward and is determined by Ff < Us * 12 N

Question 33

14. If vector A = 5.0, vector B = 8.0, and,a = 30°, then the scalar product of the two vectors shown is

A) +35
B) -20
C) +40
D) -35

Answer 33

D) -35

Question 34

In order for an object at rest on a table to remain at rest?

A) No forces may act on the object
B) the sum of the forces acting on the object must add to zero
C) the adhesive used on the object and the table must be really strong
D) Only one pair of forces that are equal and opposite may act on the object

Answer 34

B) the sum of the forces acting on the object must add to zero

Question 35

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is?

A) Smaller than the change in momentum of the larger mass, but not zero
B) larger than the change in momentum of the larger mass
C) equal than the change in momentum of the larger mass
D) zero
E) There is not enough information to answer the question

Answer 35

C) equal than the change in momentum of the larger mass

Question 36

The area under the curve on a force versus Time (F vs. t) graph represents?

A) impulse
B) momentum
C) work
D) kinetic energy
E) potential energy

Answer 36

A) impulse

Question 37

A small car meshes with a large truck in a head-on collision. Which of following statement concerning the magnitude of the average collision force is correct?

A) The truck experiences the greater average force
B) the small car experiences the greater average force
C) the small car and the truck experiences the same average force
D) There is not enough information to answer the question

Answer 37

C) the small car and the truck experiences the same average force

Question 38

A Ping-Pong ball moving east at a speed of 4 m/s, collides with a stationary bowling ball. The ping-pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude of impulse during the collision?

A) neither; both experienced the same magnitude impulse
B) the ping-pong ball
C) the bowling ball
D) D) There is not enough information to answer the question

Answer 38

A) neither; both experienced the same magnitude impulse

Question 39

An elastic collision of two objects is characterized by the following?

A) Total momentum of the system is conserved
B) total energy of the system remains constant
C) total kinetic energy of the system remains constant
D) only A and B are true
E) A, B, and C and each true

Answer 39

E) A, B, and C and each true

Question 40

An inelastic collision of two objects is characterized by the following?

A) Total momentum of the system is conserved
B) total energy of the system remains constant
C) total kinetic energy of the system remains constant
D) only A and B are true
E) A, B, and C and each true

Answer 40

D) only A and B are true

Question 41

Jacques and George meet in the middle of e lake while paddling in their canoes. They come to a complete stop and talk for a while. When they are ready to leave, Jacques pushes George’s canoe with a force T to separate the two canoes. Which of the following is a true statement about the final momentum and kinetic energy of the system?

A) the final momentum is in the direction of F but the final kinetic energy is zero J
B) the final momentum is in the direction opposite of F but the final kinetic energy is zero J
C) the final momentum is in the direction of F but the final kinetic energy is positive
D) the final momentum is zero kg * m/s and the final kinetic energy is zero J
E) the final momentum is zero kg * m/s but the final kinetic energy positive

Answer 41

E) the final momentum is zero kg * m/s but the final kinetic energy positive

Question 42

A mass of 2 traveling at 3 m/s undergoes a one-dimensional elastic collision with a group of four 1 kg masses that are at rest in contact with each other and lined up in the same direction as the velocity of the 2 kg mass. As a result of the collision?

A) the 2kg mass comes to a stop and one of the 1 kg masses takes off at 6 m/s
B) the 2kg mass comes to a stop and two of the 1 kg masses takes off at 3 m/s
C) the 2kg mass comes to a stop and three of the 1 kg masses takes off at 2 m/s
D) the 2kg mass comes to a stop and all four of the 1 kg masses takes off at 2 m/s
E) the 2kg mass and the five other masses travel at 1 m/s

Answer 42

B) the 2kg mass comes to a stop and two of the 1 kg masses takes off at 3 m/s

Question 43

9) A red ball with a velocity Of +3.0 m/s elastically collides head-on with a yellow ball Of equal mass -2.0 m/s. What is the velocity of the red ball after the collision?

A) zero
B) -2 m/s
C) +3 m/s
D) 2.5 m/s
E) +5.0 m/s

Answer 43

B) -2 m/s

Question 44

10)In O game Of pool, the white cue ball hits the #9 ball and is deflected at a 35 angle of motion. Assume that the masses are actually equal and that the collision is elastic. What is the angle of deflection below the original line of motion for the #9 ball?\

A) 15
B) 35
C) 55
D) 75
E) 90

Answer 44

C) 55

Question 45

11) A plane, flying horizontally, releases a bomb, which explodes at some time before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments just after the explosion?

A) is zero
B) moves horizontally
C) moves vertically
D) moves along a parabolic path

Answer 45

D) moves along a parabolic path

Question 46

12) Two cars collide head-on on a level, nearly frictionless frozen lake. (It’s the first day of ice fishing season!) The collision was perfectly inelastic and both cars quickly came to rest during the collision without sliding across the ice. What is true about what the velocity of this system’s center of mass was before the collision?

A) It was always zero
B) It was never zero
C) it was not initially zero, but it ended up zero
D) none of these is ture

Answer 46

A) It was always zero