Chapter 4 Test

Question 1

An exert of force when you sit in a chair or something.

Answer 1

Force

Question 2

Give 3 examples of force exerted on an object

Answer 2

1. Throwing a ball
2. Catching a ball
3. Hitting a ball

Question 3

The SI Unit of force is called the ______ and defined as the same amount of force that, when acting on 1 kg mass, produces an acceleration of 1m/s2

Answer 3

newton

Question 4

The weight of an object is a measure of the _______ of the _____ _____ on the object.

Answer 4

magnitude

gravitational force

Question 5

Explain Contact force

Answer 5

Result from physical contact between two objects

Question 6

Explain Field force

Answer 6

Does not involve physical contact between two objects.

Question 7

All _____ contact forces are due to _____ field forces.

Answer 7

macroscopic

microscopic

Question 8

The _____ of an object depends on the force’s _____

Answer 8

acceleration

magnitutde

Question 9

The ____ in which an object moves depends on the ____ of the force

Answer 9

direction

direction

Question 10

What 2 factors make force a vector quantity?

Answer 10

magnitude

direction

Question 11

Give 3 examples

A force causing an object to start moving

Answer 11

1. Pushing a wagon
2. Pulling a chain
   3, Throwing a ball

Question 12

Give 3 examples

A force causing an object to stop moving

Answer 12

1. Catching a ball with your mitt
2. Stopping a skateboard with your foot
3. Braking in a car

Question 13

Give 3 examples

A force causing an object to change its direction of motion

Answer 13

1. Hitting a baseball
2. Tackling a football player
3. Turning a car

Question 14

An object at rest remains at rest and an object in motion continues in motion with constant velocity

Answer 14

Newton’s First Law

Question 15

The tendency of an object not to accelerate

Answer 15

Inertia

Question 16

A single force that acts on an object as a result of the interaction between the objects and its environment.

Answer 16

External force

Question 17

The vector sum of all forces acting on an object

Answer 17

Net force

Question 18

_____ is the measure of inertia

Answer 18

mass

Question 19

The inertia of an object is _____ to the object’s mass

Answer 19

proportional

Question 20

Objects that are either at rest or moving with constant velocity

Answer 20

equilibrium

Question 21

What condition must be true for equilibrium?

Answer 21

The net force acting on a body in equilibrium must be equal to zero.

Question 22

Can an object be in equilibrium if only one force acts on it? Why?

Answer 22

No, a second force equal and opposite to the first net force must be present for the object to be at equilibrium.

Question 23

If a car is traveling westward with a constant velocity of 20 m/s, what is the net force acting on the car

Answer 23

0

Question 24

If a car is accelerating downhill under a net force of 3674 N, what additional force would cause the car to have a constant velocity?

Answer 24

-3674

Question 25

The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the object's mass

Answer 25

Newton's Second Law

Question 26

Newton's Second Law Equation

Answer 26

net force= mass x acceleration

Question 27

If 2 objects interact, the magnitude of the force exerted on object 1 by object 2 is equal to the magnitude of the force simultaneously exerted on object 2 by object 1, and these 2 forces are opposite in direction.

Answer 27

Newton's Third Law

Question 28

Forces always exist in _____

Answer 28

pairs

Question 29

For every _____, there an equal and opposite ____.

Answer 29

action | reaction

Question 30

Action force

Answer 30

The force object 1 exerts on object 2

Question 31

Reaction force

Answer 31

the force object 2 exerts on object 1

Question 32

1. A 6.0 kg object undergoes an acceleration of 2.0m/s2. a. What is the magnitude of the net external force acting on it? b. If this same force is applied to a 4.0 kg object, what acceleration is produced?

Answer 32

a. 12 N | b. 3

Question 33

a child causes a wagon to accelerate by pulling it with a horizontal force. newton's third law says that the wagon exerts an equal and opposite form on the child. how can the wagon accelerate?

Answer 33

the child had to accelerate (not the wagon)

Question 34

identify action-reaction pairs in the following situations. a. a person takes a step. b. a snowball hits someone in the back c. a baseball player catches a ball d. a gust of wind strikes a window

Answer 34

a. the ground exerts force on the foot b. the back exerts force on the snowball c. the glove exerts force on the ball d. the window exerts force on the wind

Question 35

gravitational force exerted on an object.

Answer 35

weight

Question 36

a force that acts on the surface in a direction perpendicular to the surface.

Answer 36

normal force

Question 37

the force that resists the initiation of sliding motion between two surfaces that are in contact and at rest.

Answer 37

static friction

Question 38

the force that opposes the movement of 2 surfaces that are in contact and sliding over each other.

Answer 38

kinetic friction

Question 39

the quantity that expresses the dependence of frictional forces on the particular surfaces.

Answer 39

coefficient of friction

Question 40

a bag of sugar has a mass of 2.26 kg. a. what is its weight in newtons on the moon, where the acceleration due to the gravity is one-sixth that on earth? b. what is its weight on jupiter, where the acceleration of gravity is 2.64 times that on earth.

Answer 40

a. 2.26(9.8) = 3.7 N | b. 2.26(2.64 x 9.8) = 58.5 N