Chapter 4 Review Flashcards
the weight of the object being moved
load
an object that makes work easier
machine
the force that pulls objects towards the earth
gravity
the force that causes an object to move
effort
the force that resists the movement of objects against each other
friction
a change in an object’s position
motion
a flat, sloped surface
inclined plane
a wheel with a rod running through it
wheel and axle
a bar that turns on a point
lever
one or more inclined planes used to force things apart
wedge
an inclined plane wound around an axle
screw
a wheel with a groove that can hold a rope
pulley
true or false
a force is a push or pull
true
true or false
something moves when the forces acting on it become balanced
false
true or false
a fulcrum is the point on which a lever turns
true
true or false
wheel and axles with “teeth” that work together are called pulleys
false
true or false
both fixed and movable pulleys are used in a block and tackle
true
The amount of effort needed on a lever is determined by the distance between the effort and the ____.
fulcrum
It takes ____ force to move a heavier object than to move a lighter object.
more
A block and tackle allows you to use ___ force when lifting an object by moving the rope a greater distance.
less
A longer inclined plane allows you to use _____ force to move an object.
less
When you use ____ force on an object, it will have a greater change in position.
more
What type of simple machine is this:
a knife
wedge
What type of simple machine is this:
top of a flagpole
pullet
What type of simple machine is this:
a ramp
inclined plane
What type of simple machine is this:
door knob
wheel and axle
What type of simple machine is this:
paint can opener
lever
What type of simple machine is this:
screw
screw
