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Chapter 4
Forces and Machines
22
Science
4th Grade
12/05/2011

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Cards

Term
A bar that turns on a point
Definition
lever
Term
A change in an object's position
Definition
motion
Term
A flat, sloped surface
Definition
inclined plane
Term
A heavier object takes ___ force to move than a lighter object
Definition
more
Term
A longer inclined plane allows you to use ___ force move an object
Definition
less
Term
A push or a pull
Definition
force
Term
A wheel with a groove that can hold a rope
Definition
pulley
Term
A wheel with a rod running through it
Definition
wheel and axle
Term
An inclined plane wound around an axle
Definition
screw
Term
An object moves when the forces acting on it become ___
Definition
unbalanced
Term
An object that makes work easier
Definition
machine
Term
Determined by the distance between the effort and the fulcrum
Definition
the amount of effort needed on a lever
Term
One or more inclined planes used to force things apart
Definition
wedge
Term
The force that causes an object to move
Definition
effort
Term
The force that pulls objects toward the earth
Definition
gravity
Term
The force that resists the movement of objects against each other
Definition
friction
Term
The point on which a lever turns
Definition
a fulcrum
Term
The weight of the object being moved
Definition
load
Term
Uses both fixed and moveable pulleys
Definition
block and tackle
Term
Wheel and axles with "teeth" that work together
Definition
gears
Term
When a force moves an object for a distance
Definition
work is done
Term
When you use ___ force on an object, it will have a greater change in position
Definition
more
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