Energy Stores
A ball held high is dropped.
State the initial and final energy store of the ball.
Initial: Gravitational Potential
Final: Kinetic
A piece of burning wood heats a nearby metal rod.
State the initial and final energy store of the wood.
Initial: Chemical
Final: Internal
A solar panel charges a battery.
What energy transfer pathway(s) is/are present?
Propagation of waves (Light)
Find the kinetic energy of a 2.0 kg ball moving at 3.0 m/s.
9.0 J
How much gravitational potential energy does a 0.5 kg book have on a 1.5 m high shelf?
7.5 J
A moving car brakes and comes to a stop.
State the initial and final energy store of the car.
Initial: Kinetic
Final: Internal
A person lifts a weight.
State the initial and final energy stores of the person.
Final: Gravitational potential
A fire heats a nearby metal rod.
What energy transfer pathway(s) is/are present?
Heating
A 5.0 kg object is lifted 2.0 m above the ground. Find its gravitational potential energy.
100 J
Find the kinetic energy of a 3.0 kg ball moving at 4.0 m/s.
24.0 J
A stretched elastic band is released.
State the initial and final energy store of the band.
Initial: Elastic Potential
Final: Kinetic
A roller coaster descends from the top of a track.
State the initial and final energy stores of the roller coaster.
Initial: Gravitational potential
Final: Kinetic
A loudspeaker produces sound from an audio signal.
What energy transfer pathway(s) is/are present?
Electrically, Mechanical
How high must a 3.0 kg object be lifted to gain 90 J of gravitational potential energy?
3.0 m
A moving object has 200 J of kinetic energy and is moving at 5.0 m/s. Find its mass.
16.0 kg
A hot spoon placed in cold water cools down.
State the initial and final energy store of the spoon.
Initial: Internal
Final: Internal (reduced)
A person eats food and then runs.
State the initial and final energy stores of the person.
Initial: Chemical
Final: Kinetic and Internal
A battery powers a light bulb.
What energy transfer pathway(s) is/are present?
Electrically, Propagation of waves (Light)
An object stores 500 J of gravitational potential energy when lifted 2.0 m above the ground. Find its mass.
25.0 kg
A person lifts a 70 kg box up a 5.0 m ramp. Find the increase in gravitational potential energy.
3500 J
A battery powers a light bulb.
State the initial and final energy store of the battery.
Initial: Chemical
Final: Internal
A wind-up toy is released.
State the initial and final energy stores of the toy.
Initial: Elastic potential
Final: Kinetic
An electric kettle heats water.
What energy transfer pathway(s) is/are present?
Electrically, Heating
A cyclist has 1200 J of kinetic energy. If their mass is 60 kg, find their speed.
6.32 m/s
A 1.2 kg object has 7.2 J of kinetic energy. Find its speed.
3.46 m/s