P2.2 Kinetic energy Flashcards
What happens to the kinetic energy when an object speed up?
Kinetic energy increases
When is work done?
When a force causes an object to move through a distance
What is power?
-Work done or energy transferred in a given time
What is gravitational potential energy
- Energy that an object has
- By virtue of its position in a gravitational field
When an object is raised vertically what is work is done against? What does the object gain?
- Gravitational force
- Gains gravitational potential energy.
What does the kinetic energy of an object depend on?
Its mass and its speed
How do forces cause a change in speed of an object?
By doing work
What is momentum and what is it measured in?
A property of moving objects.
kgm/s
Explain the conservation of momentum
IN A CLOSED SYSTEM, total momentum before and after the event are the SAME
What is a closed system?
A system that doesn’t exchange any matter with it’s surroundings
How can you tell when two objects have equal momentum?
When they stop when they collide
How can you calculate the speed of two objects that become attached when they collide? (4 steps)
- Find separate MOMENTUMS of both objects
- ADD momentums
- And ADD MASSES of objects together
- Find velocity
What happens in an elastic collision?
Momentum stays same
No loss of kinetic energy