Science - Chapter 7 - Test 1/30/14

Question 1

The combination of all forces is called the ______.

Answer 1

The combination of all forces is called the net force.

Question 2

In an unbalanced force all forces acting on an object are not _______.

Answer 2

In an unbalanced force all forces acting on an object are not equal.

Question 3

A _______ is a push or pull.

Answer 3

A force is a push or pull.

Question 4

the strength of a force is measure in the SI unit called the ________.

Answer 4

the strength of a force is measure in the SI unit called the newton (N).

Question 5

What are the 2 types of forces?

Answer 5

1. balanced
2. unbalanced

Question 6

The Newton was named after the scientist ________.

Answer 6

The Newton was named after the scientist Isaac Newton.

Question 7

Motion does not occur when there is a ______ force.

Answer 7

Motion does not occur when there is a balanced force.

Question 8

In a balanced force, all forces acting on an object are ______ and cancel each other out.

Answer 8

In a balanced force, all forces acting on an object are equal and cancel each other out.

Question 9

Motion occurs when there is an _______ force.

Answer 9

Motion occurs when there is an unbalanced force.

Question 10

A _______ is described by its strength and by the direction which it acts.

Answer 10

A force is described by its strength and by the direction which it acts.

Question 11

Name the 4 types of friction.

Answer 11

1. rolling
2. liquid
3. sliding
4. static

Question 12

_________ is the force that pulls objects toward each other.

Answer 12

Gravity is the force that pulls objects toward each other.

Question 13

The force that two surfaces exert on each other when they rub together with each other is called _______.

Answer 13

The force that two surfaces exert on each other when they rub together with each other is called friction.

Question 14

Gravitational force depends on the ________ between objects.

Answer 14

Gravitational force depends on the distance between objects.

Question 15

Name the two factors that affect the force of friction.

Answer 15

1. types of surfaces
2. how hard the surfaces are rubbed together

Question 16

Friction acts in a direction _______ to the direction of the object’s motion

Answer 16

Friction acts in a direction opposite to the direction of the object’s motion

Question 17

_______ friction occurs between objects that aren’t moving.

Answer 17

Static friction occurs between objects that aren’t moving.

Question 18

The law of _________ states that the force of gravity acts between all objects in the universe that have mass.

Answer 18

The law of Universal Gravity states that the force of gravity acts between all objects in the universe that have mass.

Question 19

What is an example of fluid friction?

Answer 19

a fish swimming in water

Question 20

The more mass an object has, the greater its _________ force.

Answer 20

The more mass an object has, the greater its gravitational force.

Question 21

Name the two factors that affect the gravitational attraction between objects.

Answer 21

1. mass
2. distance

Question 22

________ friction occurs when a solid object moves through a fluid.

Answer 22

Fluid friction occurs when a solid object moves through a fluid.

Question 23

______ friction occurs when 2 solid objects slide over each other.

Answer 23

Sliding friction occurs when 2 solid objects slide over each other.

Question 24

Gravity is a force that pulls objects _______ down toward the center of Earth.

Answer 24

Gravity is a force that pulls objects straight down toward the center of Earth.

Question 25

\_\_\_\_\_\_\_\_ friction occurs when an object rolls across a surface.

Answer 25

***_Rolling_*** friction occurs when an object rolls across a surface.

Question 26

Newton's 1st law of motion states that rest will remain at rest unless acted upon by a nonzero \_\_\_\_\_\_\_\_.

Answer 26

Newton's 1st law of motion states that rest will remain at rest unless acted upon by a nonzero ***_net force_***.

Question 27

Newton's 2nd law states that an object's _______ depends on its mass and on the net force action on it.

Answer 27

Newton's 2nd law states that an object's ***_acceleration_*** depends on its mass and on the net force action on it.

Question 28

Newton's 3rd law states that if one object exerts a _______ on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.

Answer 28

Newton's 3rd law states that if one object exerts a ***_force_*** on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.

Question 29

Resistance to change in ______ is called inertia.

Answer 29

Resistance to change in ***_motion_*** is called inertia.

Question 30

If an object is not moving, it will not start moving unless a _______ acts on it.

Answer 30

If an object is not moving, it will not start moving unless a ***_force_*** acts on it.

Question 31

Newton's 1st law of motion is also called the \_\_\_\_\_\_\_\_\_\_.

Answer 31

Newton's 1st law of motion is also called the ***_law of inertia_***.

Question 32

Inertia depends on \_\_\_\_\_\_\_.

Answer 32

Inertia depends on ***_mass_***.

Question 33

The greater the mass of an object, the greater the \_\_\_\_\_\_\_.

Answer 33

The greater the mass of an object, the greater the ***_inertia_***.

Question 34

If an object is moving, it will continue to move unless a force acts on it to change its \_\_\_\_\_\_\_\_\_\_\_.

Answer 34

If an object is moving, it will continue to move unless a force acts on it to change its ***_speed or direction_***.

Question 35

What formula can we use to find the force of an object?

Answer 35

force = mass x acceleration

Question 36

For every action, there is an \_\_\_\_\_\_\_\_\_.

Answer 36

For every action, there is an ***_equal but opposite reaction_***.

Question 37

When a car you are in stops suddenly, you move ________ because of inertia.

Answer 37

When a car you are in stops suddenly, you move ***_forward_*** because of inertia.

Question 38

When you walk you push ________ on the ground with your feet, the Earth pushes up on your feet with the same force.

Answer 38

When you walk you push ***_backward_*** on the ground with your feet, the Earth pushes up on your feet with the same force.

Question 39

What law makes this happen: When you walk you push backward on the ground with your feet, the Earth pushes up on your feet with the same force.

Answer 39

Newton's 3rd law

Question 40

What object would accelerate faster, an empty or full shopping cart?

Answer 40

empty shopping cart

Question 41

If a car is going 70 mph, how fast is the person in the car going?

Answer 41

70 mph