Chapter 9 Review

Question 1

The ability to do work

Answer 1

energy

Question 2

the amount of matter in an object

Answer 2

mass

Question 3

the ability to make something move

Answer 3

mechanical energy

Question 4

the change in an object’s position

Answer 4

motion

Question 5

a fixed unmoving object or location

Answer 5

reference point

Question 6

determined by an object’s mass and velocity

Answer 6

momentum

Question 7

the resistance to a change in motion

Answer 7

inertia

Question 8

a push or pull that causes an object to change speed or direction

Answer 8

force

Question 9

occurs whenever an object speeds up, slows down, or changes direction

Answer 9

acceleration

Question 10

keeps an object from moving against other objects

Answer 10

friction

Question 11

is this an example of acceleration, distance, speed, or velocity… Emily’s coach started timing Emily’s run. At 10 minutes Emily had run 1 mile and at 15 minutes she had run 2 miles.

Answer 11

Distance

Question 12

is this an example of acceleration, distance, speed, or velocity… Emily usually runs 6.5 mi/hr

Answer 12

speed

Question 13

is this an example of acceleration, distance, speed, or velocity… Connor increased his speed, passed the runner, and won the race

Answer 13

acceleration

Question 14

is this an example of acceleration, distance, speed, or velocity… On the day of the race, Jax ran along the track toward the east at 7.5 mi/hr

Answer 14

velocity

Question 15

is this an example of acceleration, distance, speed, or velocity… The runner at the front of the race suddenly stumbled over a piece of gravel. His speed slowed.

Answer 15

Acceleration

Question 16

Force is measured in

Answer 16

Newtons

Question 17

The spot where a lever turns

Answer 17

Fulcrum

Question 18

The resistance force works against what?

Answer 18

the effort

Question 19

What is a simple machine

Answer 19

A simple machine makes work easier by strengthening the force used to do the work or by changing the direction of the applied force

Question 20

A slide is an example of what?

Answer 20

an inclined plane

Question 21

A doorknob is an example of what?

Answer 21

wheel and axle

Question 22

A block and tackle contains …

Answer 22

a block and tackle combines multiple fixed and moveable pulleys.

Question 23

What unit is used to measure work?

Answer 23

joule

Question 24

The decrease in effort that is needed to move an object

Answer 24

mechanical advantage

Question 25

What is a bar that turns on a point called?

Answer 25

Lever

Question 26

Which machine is actually an inclined plane would around a cylinder or cone?

Answer 26

screw

Question 27

which machine consists of two inclined planes placed back to back

Answer 27

wedge

Question 28

Which simple machine makes work easier by either changing the direction of the force or by reducing the amount of force needed to move an object?

Answer 28

pulley

Question 29

Which Law of Motion is being used in the example: The rocket is launched, expelled gases downward to the ground, causing the rocket to move upward

Answer 29

third law of motion

Question 30

Which Law of Motion is being used in the example: it took one student to pick up a box filled with feathers and two students to pick up the same-sized box filled with books

Answer 30

second law of motion

Question 31

Which Law of Motion is being used in the example: You are ice-skating and hit a hidden rock in the ice. You fall when you hit the rock.

Answer 31

first law of motion

Question 32

Who formulated the three laws of motion

Answer 32

Sir Isaac Newton

Question 33

In what way does friction affect motion?

Answer 33

Friction is a force that keeps objects from moving against other objects. Friction works against inertia and helps us to walk.

Question 34

What effect does gravity have on motion?

Answer 34

Gravity keeps an object from moving indefinitely in a straight line.