Energy and Motion

Question 1

A wagon is pulled down a hill with a constant velocity. All forces on the wagon are ….

Answer 1

Balanced

Question 2

An action force and its reaction force are … in size and … in direction

Answer 2

Equal
opposite

Question 3

Jason pulls a box with a force of 3N, and john pulls the box from the opposite side with a force of 4N, ignoring friction, who does the box move toward?

Answer 3

John

Question 4

A more massive marble collides with a less massive one that is not moving. The total momentum after the collision is equal to the … momentum of the more … marble

Answer 4

original
massive

Question 5

which force keeps Venus in orbi around the sun?

Answer 5

gravity

Question 6

You and a classmate are one meter apart. If you move farther away, how does the gravitational force between you and your classmate change?

Answer 6

It decreases

Question 7

You kick a ball on a level sidewalk. It rolls to a stop because of what force slowing it down?

Answer 7

friction

Question 8

You push a chair at a constant velocity using a force of 5N to overcome friction. You stop to rest, then push again. To start the chair moving again, you just use a force that is greater than …?

Answer 8

5N

Question 9

As you climb up a mountain, air pressure …

Answer 9

increases

Question 10

If you squeeze a balloon in the middle, what happens to the air pressure inside?

Answer 10

It increases throughout

Question 11

Work can be calculation from force and …

Answer 11

distance

Question 12

A position describes an object’s location based on a …

Answer 12

reference point

Question 13

Maria walked 2 km in half and hour. what was her average speed during her walk?

Answer 13

4 km/hr

Question 14

A vector is a quantity that has size and …

Answer 14

direction

Question 15

Mary and Keisha run with the same constant speed but in opposite directions. The girls have different …

Answer 15

velocities

Question 16

A swimmer increases her speed as she approaches the end of the pool. Her acceleration is in the same direction as her …

Answer 16

motion

Question 17

A cheetah can go from 0 m/s to 40 m/s in 2 s. What is the cheetah’s acceleration?

Answer 17

20 m/s^2

Question 18

Jon walks for a few minutes, then runs for a few minutes. During this time his average speed is less than his … speed

Answer 18

final

Question 19

a car traveling at 40 m/s clowns down to 20 m/s. During this time, the car has … acceleration.

Answer 19

negative

Question 20

Newton’s second law states that in increase acceleration, you increase …

Answer 20

force

Question 21

What units are used to measure force?

Answer 21

Newtons

Question 22

If you balance a book on your head, you are not doing work on the book because the book is not …

Answer 22

moving

Question 23

Energy that an object has because of its position or shape is called …

Answer 23

potential energy

Question 24

A falling ball has a potential energy of 15J and a kinetic energy of 15J. What is the ball’s mechanical energy?

Answer 24

30J

Question 25

The unit of power is one ... of work done in one second

Answer 25

watt

Question 26

By increasing the speed at which you work, you increase your ...

Answer 26

power

Question 27

A ball kicked into the air will have the greatest gravitational potential energy is at the ... point

Answer 27

highest

Question 28

Explain the difference between kinetic energy and potential energy and how energy can change forms

Answer 28

Kinetic energy is energy in motion potential energy is all the possible energy in an object energy can change forms through convection, conduction, and radiation.

Question 29

Suppose you are pushing a child on a swing. During what space of time are you doing work on the swing?

Answer 29

When you apply force and push the swing

Question 30

Explain the three ways energy can be transferred

Answer 30

conduction- energy conversion through direct touch convection- energy conversion through liquid and gas radiation- energy conversion through waves