Science is Fun
Energy that is ready to be used
potential energy
a straight bar that moves on a fixed point.
lever
Which is a compound machine? (choose all that are correct)
bicycle scissors can opener slide
bicycle scissors can opener
When forces move an object or change an object's motion.
work
an inclined plane wrapped into a spiral.
screw
___ happens when a force changes the motion of an object.
work
Energy in motion.
kinetic energy
a machine with a flat, slanted surface.
inclined machine
When does a roller coaster have the most potential energy?
sitting at the top of a hill
Something that makes work easier to do.
machine
a machine that splits objects apart
wedge
What is the object lifted by the lever?
load
Machines with few or no moving parts.
simple machine
a kind of lever that uses a rope and wheel to lift an object
pulley
What is the fixed point on a lever?
fulcrum
Two or more simple machines put together.
compound machine
a wheel that moves on a post
wheel and axle
A flying plane has _____ because it is _____.
A. kinetic energy moving
B. potential energy moving
A. kinetic energy moving
When wood is burned, its _____ changes into ____.
A. potential energy kinetic energy
B. kinetic energy potential
A. potential energy kinetic energy