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Physics > Midterm Review > Flashcards

Midterm Review Flashcards

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1
Q

As the distance between two bodies increases, the force of attraction between the bodies ________ .

A

A. decreases

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2
Q

The slope of a position versus time graph gives _______________________________.

A

average velocity

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3
Q

An accelerating object travels _________________

A

slower during each second that it moves AND farther during each second that it moves

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4
Q

Which encounters a greater force of air resistance, a falling elephant or a falling feather?

A

the feather

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5
Q

The best measure of an object’s inertia is its ____.

A

mass

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6
Q

The unit for power in the SI system is ____.

A

watt

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7
Q

An object with mass m is thrown straight up. At its highest point, the net force on it is

A

mg

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8
Q

What would the rate of speed of a man running 60 ft in 10 sec be?

A

6 ft/sec

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9
Q

A block with a mass of 10 kg is located 30 m above a road. If the block fell, what would be its kinetic energy at the moment it struck the road? (PE = KE) (PE=mass x accel. of gravity x height) (accel. of gravity = 9.8m/secSQUARED)

A

3000 joules

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10
Q

Efficiency of work is the ratio of work output to

A

work input

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11
Q

What is the force called with which the earth pulls on an object?

A

gravity

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12
Q

The transfer of energy by mechanical means is

A

work

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13
Q

A negative linear acceleration indicates that an eastward moving object is

A

slowing down

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14
Q

The ___ component(s) of a projectile’s velocity will change while the projectile is in the air.

A

vertical (Vy)

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15
Q

Which of the following is not a type of energy?

Potential Kinetic Heat Cold

A

Cold

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16
Q

A pendulum at the bottom of its swing is an example of ___ energy.

A

kinetic

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17
Q

A rock is thrown from a catapult at an angle of of 25 degrees above the horizontal with an initial velocity of 45 m/s. Find the horizontal and vertical components of the rock’s initial velocity

A

41m/s, 19 m/s

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18
Q

When an object is in motion it is said to have

A

kinetic energy

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19
Q

In what direction does friction act with respect to the motion of a sliding object?

A

in the opposite direction

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20
Q

A quantity that has both magnitude and direction is referred to as

A

vector

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21
Q

If you raised a physics book 5 m, it gains a certain amount of PE . However, if you raised another book (with the same mass) 10 m, its PE is

A

twice as much

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22
Q

The equation to find the weight of an object is

A

weight = mass x g

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23
Q

When a body is at rest, _____

A

all of the forces are in balance

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24
Q

Newton’s second law of motion tells us that as the force on an object increases, the acceleration

A

increases

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25
Q

A dog swims west across a river at 3.0 m/s relative to the river that flows north at 5.0 m/s. Find the magnitude and direction of the dog’s resultant velocity.

A

5.8m/s, 31 degrees W of N

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26
Q

You are standing n a moving bus, facing forward, and you suddenly fall backward. You can imply from this that the bus’s

A

velocity increased

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27
Q

An object weighing 40N on the earth’s surface would weigh only 10 N when its distance from the center of the earth is

A

doubled

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28
Q

Which best describes the maximum height a projectile reaches?

A

Dy

29
Q

Stored energy is ___ energy

A

potential

30
Q

An apple hanging in a tree has potential energy equal to its weight multiplied by its

A

height in the tree

31
Q

The tendency of an object to resist change in its motion is called

A

inertia

32
Q

Which of the following is the correct unit for kinetic energy in the SI system?
Watt? Newton? Joule? Joule/sec

A

Joule

33
Q

If the mass of the earth were to double with no change in size, your weight would

A

increase

34
Q

“Energy can neither be created nor destroyed.” This means that a system’s total energy remains constant. This is the Law of Conservation of

A

energy

35
Q

When the same net force is applied to two blocks, the yellow one has a larger acceleration than the blue one. Which of the following is correct?
The yellow block has a larger mass?
They have the same mass?
The blue block has a larger mass?

A

The blue block has a larger mass.

36
Q

A Newton is defined as

A

kg m/sSQUARED

37
Q

Power is defined as

A

the rate at which work is being done

38
Q

Your teacher has walked from the physics room around the entire school and back to the physics room. Your teacher’s displacement is

A

Zero

39
Q

A box weighs 25 N on earth. A second box weighs 25 N on the moon. which as the greater mass?

A

The one on the moon.

40
Q

A ball falling from a great height will reach terminal velocity when _________________.

A

the force of air resistance equal its weight

41
Q

The slope of an distance vs. time graph will tell _____________ .

A

velocity

42
Q

Ignoring air resistance, the horizontal component of a projectile’s acceleration _______________.

A

is zero

43
Q

According to Newton’s _____ Law, an object at rest stays at rest and an object in motion stays in motion when no net force acts on it.

A

1st

44
Q

For every action force, the reaction force is a(n) ___.

A

equal and opposite in direction

45
Q

What is the mass of an object that weighs 150N on earth?

A

15 kg

46
Q

The acceleration due to gravity here on earth is numerically equal to

A

9.8 m/secSQUARED

47
Q

190mm =

A

0.19

48
Q
  1. An Atlanta Braves pitcher drops a baseball into the Chattahoochee River from a very high bridge while a pitcher from the Boston Red Sox throws one straight down from the same bridge. Ignoring air resistance, the vertical acceleration just before striking the water ___________ .
A

is the same for both baseballs

49
Q

According to Newton’s ___Law of Motion, an object with no net force acting on it remains at rest or in motion with a constant velocity.

A

1st

50
Q

An object sits on a frictionless surface. A 16 N force is applied to the object, and it accelerates at 2 m/sSQUARED. The mass of the object is ______________ .

A

8 kg

51
Q
  1. Two cantaloupes are dropped at the same time from the 7.5 m tall stadium bleachers. If the first cantaloupe weighs 1.5 N & the second cantaloupe weighs 5.0 N, then which cantaloupe hits first? Neglect air resistance.
A

both reach the ground at the same time

52
Q

According to Newton’s Law of Universal Gravitation, the force of attraction between any two masses is related directly to ________

A

the product of the masses

53
Q

The physics teacher can go up a flight of stairs in 20 seconds. If the physics teacher weighs 600 N and the vertical height of the stairs is 10 m, the teacher’s power output is _____.

A

300 W

54
Q

While attempting to follow the directions on a map, a hiker walks 45.0 meters south, then turns to the west and walks 7.5 meters. What is the hiker’s displacement?

A

45.6 meters, 9.5 degrees west of south

55
Q

Mechanical work is done only when a force _______.

A

moves an object

56
Q

The rate at which velocity changes is _____.

A

acceleration

57
Q

Projectiles are objects that are given an initial velocity and then move only under the influence of ___.

A

gravity

58
Q

Work done by a machine is usually accomplished _____.

A

by converting energy from one form to another

59
Q

If the mass and weight of an astronaut are measured on the earth and on the moon, we will find that the masses are ___ and the weights are ___.

A

the same . . . different

60
Q

A 4 kg ball is thrown at 2 m/s. The ball’s momentum is

A

8 kg m/s

61
Q

A student drops a rock from a bridge to the water 12.0 meters below. How long does it take the rock to hit the water?

A

1.2 s

62
Q

An airplane travels at 165 km/hr northwest. What is the plane’s displacement if it travels for 3.5 hours?

A

577.75 km NW

63
Q

an object with a mass of 10-kg is moving at a speed of 2 meters per second. Calculate the kinetic energy in joules. [KE=1/2mvSQUARED]

A

20-J

64
Q

A brick is thrown downward form the top of a building with an initial speed of 25 m/s. It strikes the ground after 2 s. How high is the building?

A

70 m

65
Q

A rock is thrown from a catapult at an angle of 25 degrees above the horizontal with an initial velocity of 45 m/s. Find the vertical and horizontal components of the rocks initial velocity.

A

41 m/s, 16 m/s

66
Q

Centripetal forces always act in which direction?

A

toward the center

67
Q

A force is directly proportional to

A

mass, acceleration

68
Q

Which of the following has kinetic energy?
A baseball in flight.
A rock located 6 ft above the ground.
An inflated balloon. .
A bow string that is stretched just before release.

A

A baseball in flight.

69
Q

If we graph velocity vs. time for a moving object, what is the slope?

A

acceleration

Physics (4 decks)

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