Chapter 15- Forces and Motion

Question 0

What are forces measured in?

Answer 0

Forces are measured in units called newtons

Question 1

What is a force?

Answer 1

A force is a push or a pull

Question 2

What is friction?

Answer 2

Friction is the force that resists the movement of one surface past another

Question 3

What are two examples of moving friction?

Answer 3

Rolling friction and sliding friction

Question 4

What is gravitational force?

Answer 4

The force of attraction between any object and every other object in the universe

Question 5

Who was the first to explain many details about gravity?

Answer 5

Isaac Newton

Question 6

The gravitational force of the _____ lowers the tide and exposes the land.

Answer 6

Moon

Question 7

What is a tide?

Answer 7

A rise or fall of the water level near the ocean shore

Question 8

What are used to describe motion?

Answer 8

Speed, velocity, and acceleration

Question 9

What is speed?

Answer 9

A measure of how fast an object is moving

Question 10

What is velocity?

Answer 10

The speed of an object in a particular direction

Question 11

What is acceleration?

Answer 11

The rate at which velocity changes

Question 12

What is needed to change an objects motion?

Answer 12

A force

Question 13

What is Newton’s first law of motion?

Answer 13

An object at rest remains at rest while an object in motion remains in motion at a constant speed in a straight line, unless acted on by an unbalanced force.

Question 14

What is inertia?

Answer 14

The tendency of an object to remain at rest or in constant motion unless a force acts on it.

Question 15

What is Newton’s second law of motion?

Answer 15

The acceleration of an object depends on the mass of the object and the size of the net force applied.

Question 16

How is the second law of motion written as an equation?

Answer 16

Acceleration= force/mass

Question 17

What is Newton’s third law of motion?

Answer 17

When a force is applied to an object the object exerts an equal force in the opposite direction.

Question 18

What is Newton’s third law of motion sometimes called?

Answer 18

The law of action and reaction

Question 19

What is momentum?

Answer 19

Is it can be used to find the force needed to stop a moving object

Question 20

Which type of friction acts on a box that is moving down a ramp?

Answer 20

Sliding

Question 21

What is a force that keeps planets orbit?

Answer 21

Gravity

Question 22

What can be used to figure out the force needed to stop a moving object?

Answer 22

Momentum

Question 23

What is the unit of force?

Answer 23

Newton (n)

Question 24

What does a spring scale help you measure?

Answer 24

Force.

Question 25

Give an example of static friction

Answer 25

When you first push on a box it has static friction.

Question 26

What is the best surface for a basketball to roll across?

Answer 26

A tile floor

Question 27

Where is Earth’s gravitational pull the greatest?

Answer 27

At sea level

Question 28

The speed of an object in a particular direction is called _______.

Answer 28

Velocity

Question 29

If you pushed a 10 kg box with it 5N force what would the formula look like?

Answer 29

5n/10 kilograms

Question 30

What would happen if you had a 3N force pulling to the right and a 3N force pulling to the left?

Answer 30

Nothing will happen

Question 31

The gravitational pull of the earth keeps the moon from doing what?

Answer 31

Going out of orbit or into outerspace