Work Energy and Momentum Flashcards
what does work done mean?
work done = energy transferred
what is the formula for work done.
distance moved in the direction of the force (m) × force applied (N)
friction work is about?
the work needed to overcome friction (and is then disbursed as heat energy)
What does the gravitational potential energy depend on?
- The objects weight
- How far it moves vertically
if you increase the distance of an object from the earth then what happens to it’s gravitational potential energy?
It increases.
what is the formula for the change of gravitational energy?
mass (Kg) x Gravitational field strength (N/Kg) x change of height (m)
Power is what?
the rate of transfer of energy.
What does Kinetic energy depend on?
- Mass
- Speed
what is the formula for kinetic energy?
1/2 x mass x speed ^2 = kinetic energy
What is elastic potential energy?
energy stored in an elastic object when work is done on said object changing the shape of it.
mass x velocity = ?
momentum
what is the unit for momentum
kg m/s
in a closed system momentum is what?
conserved whenever objects interact
when two objects with unequal mass push apart what happens to them?
move at different speeds
if two objects with even mass push apart what happens?
they push apart with equal and opposite momentum (travel at same speeds)
