Level 79 Level 81
Level 80

Work, Energy, Impulse & Momentum


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Energy
(physics) the capacity of a physical system to do work
gravitational potential energy
an icicle hanging from a rooftop
Joule
is the SI unit of heat energy as well as al other forms of energy.
kinetic
Energy of motion
kinetic energy
a running dog
pendulum
A device that swings back and forth due to the force of gravity
Potential Energy
(mass) x (g) x (height)
collision
A situation in which two objects in close contact exchange energy and momentum
duration
Length of time something lasts
elastic collision
bounce off
impulse
a large change in momentum over a short period of time
Law of Conservation of Momentum
If no external forces act on a system, then the total momentum of that system remains the same
momenta
plural of momentum
net impulse
The vector sum of the impulses acting on an object