Simple Machines 5
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What is the ability to do work called?
energy
What is being done when an object is moved?
work
What kind of energy does an object in motion have?
kinetic energy
When an object has stored energy, what kind of energy does it have?
potential energy
What type of energy does food have?
chemical energy
The type of energy that the moving parts of a bicycle has is __________.
mechanical energy
What type of energy does a computer have?
electrical energy
What is the resistance caused by two objects rubbing together called?
friction
What is a force?
a push or pull
What creates heat?
friction
What is inertia?
The tendency for an object to stay in motion and resting objects to stay at rest.
What is the relationship between the amount of energy used and the amount of work accomplished called?
efficiency
How can we change the direction of a force or increase the effect of a force?
use machines
Why do we use machines?
They help us work more efficiently
What is a bar that works of a fulcrum called?
lever
A flat surface that is raised so one end is higher than the other one is an __________.
inclined plane
What simple machine is wide at one end and pointed at the other?
a wedge
What simple machine holds things together?
a screw
What simple machine is used to push, pull, or lift things?
a lever
What simple machine is used to cut or split objects?
a wedge
What simple machine is used to move objects up and down?
an inclined plane
A simple machine that is used to move or turn things is __________.
a wheel and axle
What simple machine is used to lift an object by changing the direction or amount of the force?
pulley
What is an example of a screw?
a jar lid