Chapter 4 Review

Question 1

the weight of the object being moved

Answer 1

load

Question 2

an object that makes work easier

Answer 2

machine

Question 3

the force that pulls objects towards the earth

Answer 3

gravity

Question 4

the force that causes an object to move

Answer 4

effort

Question 5

the force that resists the movement of objects against each other

Answer 5

friction

Question 6

a change in an object’s position

Answer 6

motion

Question 7

a flat, sloped surface

Answer 7

inclined plane

Question 8

a wheel with a rod running through it

Answer 8

wheel and axle

Question 9

a bar that turns on a point

Answer 9

lever

Question 10

one or more inclined planes used to force things apart

Answer 10

wedge

Question 11

an inclined plane wound around an axle

Answer 11

screw

Question 12

a wheel with a groove that can hold a rope

Answer 12

pulley

Question 13

true or false

a force is a push or pull

Answer 13

true

Question 14

true or false

something moves when the forces acting on it become balanced

Answer 14

false

Question 15

true or false

a fulcrum is the point on which a lever turns

Answer 15

true

Question 16

true or false

wheel and axles with “teeth” that work together are called pulleys

Answer 16

false

Question 17

true or false

both fixed and movable pulleys are used in a block and tackle

Answer 17

true

Question 18

The amount of effort needed on a lever is determined by the distance between the effort and the ____.

Answer 18

fulcrum

Question 19

It takes ____ force to move a heavier object than to move a lighter object.

Answer 19

more

Question 20

A block and tackle allows you to use ___ force when lifting an object by moving the rope a greater distance.

Answer 20

less

Question 21

A longer inclined plane allows you to use _____ force to move an object.

Answer 21

less

Question 22

When you use ____ force on an object, it will have a greater change in position.

Answer 22

more

Question 23

What type of simple machine is this:

a knife

Answer 23

wedge

Question 24

What type of simple machine is this:

top of a flagpole

Answer 24

pullet

Question 25

What type of simple machine is this:

a ramp

Answer 25

inclined plane

Question 26

What type of simple machine is this:

door knob

Answer 26

wheel and axle

Question 27

What type of simple machine is this:

paint can opener

Answer 27

lever

Question 28

What type of simple machine is this:

screw

Answer 28

screw