P1 - 1.5 Transfer Between KE + GPE Flashcards
When converting from kinetic energy to gravitational potential energy:
How does energy transfer when an object rises?
Kinetic energy is transferred to gravitational potential energy
When converting from kinetic energy to gravitational potential energy:
How does energy transfer when an object falls?
Gravitational potential energy is transferred to kinetic energy
If energy is being transferred from gravitational potential to kinetic what way is the object moving?
An object is falling
If energy is being transferred from kinetic to gravitational potential what way is the object moving?
An object is rising
If kinetic energy is lost what happens to gravitational potential energy
GPE is gained
If gravitational potential energy is lost what happens to kinetic energy
KE is gained
If KE is gained what happens to GPE
GPE is lost
If GPE is gained what happens to KE
KE is lost
What does GPE stand for
Gravitational potential energy
What does KE stand for
Kinetic Energy
How can energy be lost
Air resistance
Friction
A roller coaster car has 200 kJ of gravitational potential energy and zero kinetic energy when at the top of a 50 m ramp.
What is the gravitational potential energy when the roller coaster is at 25 m above the ground.
100,000J
A roller coaster car of mass 500 kg is initially stationary. It then descends through a distance of 20 m.
Calculate the kinetic energy of the roller coaster car after descending 20 m.
100,000J
A ball of mass 0.2 kg is thrown upwards with a speed of 2 m/s.
Calculate the maximum height reached by the ball.
Calculate the initial kinetic energy of ball:
Ek = 1/2x(m)x(v^2)
Ek = 1/2x0.2x2^2 = 0.4J
Calculate maximum height reached:
Maximum GPE = initial KE
GPE = mgh
0.4 = 0.12 x 10 x h
H = 0.4/0.2x10 = 0.2m
