work and energy
work and energy
using simple machines
using simple machines
100
What is done when a force changes the motion of an object?
work
100
Energy that is stored is __________.
potential energy
100
An object that makes work easier is a _______________.
machine
100
A simple machine with a flat, __________ surface is an inclined plane.
slanted
200
Picking up a book is work because a force is used and the book ____________?
moves
200
A flying plane has kinetic energy because it is _________.
Moving
200
Machines with few or no moving parts are called _______________ machines
simple
200
two or more simlpe machines working together make a _________________ _________________
compound machine
300
Dropping a book is work, because _______________ changes the motion of the book.
gravity
300
When wood or food is burned, its ________________ changes into kinetic energy.
potential energy
300
A straight bar that moves on a fixed point, such as a seesaw is a ____________.
lever
300
Inclined planes ___________ the force needed to move an object, but the object has to be pushed.
reduces
400
People need __________ to do work.
energy
400
The two main forms of energy are.....
potential and kinetic energy
400
An object that is lifted by a machine is the _________.
load
400
A ___________ is an inclined plane that is wrapped into a spiral.
screw
500
Energy makes it possible for changes in ____________ to take place.
motion
500
You ____________ energy from your body to a bowling ball when you roll the ball down an ally.
transfer
500
A ______________ uses a rope and wheel to lift a load.
pulley
500
The six simple machines are:
lever, pulley, wheel and axle, inclined plane, wedge, and screw.
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