Gravitational potential energy

Gravitational potential energy

Categorize

Options (9)

Heating

Electrical

Radiation

Mechanical

Chemical

Elastic potential

Thermal

Gravitational potential

Kinetic

Which are energy stores and which are ways that energy is transferred?

Energy store

Energy Transfer

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Energy is transferred from the ​

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store of the ball, to the ​

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store of the ball via a ​

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transfer

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gravitational potential

kinetic

mechanical

Drag and Drop

Energy from the ​

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store of the cell is transferred ​

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to the ​

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store of the lamp as the filament heats up

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chemical

electrically

thermal

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Energy is transferred ​

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from the mains supply to the ​

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store of the hob which is then transferred by ​

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to the thermal store of the ​

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electrically

thermal

heating

pan

• Heating

• Electric current (E = Q x T)

• Radiation

• Mechanical (W.D. = F x s)

Transfers

• GPE

• Kinetic

• Elastic

• Thermal

• Chemical

​Stores

We have already learned some calculations of energy transfers

Work done against a gravitational force increases GPE.

​Gravitational potential energy (GPE) is the energy an object has due to being raised above the ground.

E_p=m × g × h

Gravitational potential energy, E_p in Joules (J)

Mass, m in kilograms (kg)

Gravitational field strength, g in newtons per kilogram (N/kg) = 9.8 N/kg

Height above the ground, h in metres (m)

How much work must be done to lift a weight?

On your whiteboards

Show the calculation steps

1.A monkey lifts a lion cub with a mass of 1.5kg. He lifts him up 0.7m. How much work has he done?

On your whiteboards

Show the calculation steps

A weightlifter lifts a load of 50kg through 30cm.

1. What is the work done on this lift?

2. She/he does 40 reps, what is the total work done?

3. She/he ups the load to 80kg for 20 reps, how much work does he do?

Multiple Choice

Gravitational potential energy is directly proportional to mass

• True

• False

Multiple Choice

In a mechanic’s garage, a motorbike and a truck are both jacked 1 m above the floor. The motorbike stores more GPE than the truck.

• True

• False

Multiple Choice

Gravitational potential energy is stored by doing work against the gravitational force. 

• True

• False

Multiple Choice

During an experiment, I lift a Newton meter 1 m above the earth. If I do the same experiment on the moon, I will store less GPE in the Newton meter.

• True

• False

Calculating GPE

Worked example

A diving platform is 10 m above the ground. When an 80 kg diver climbs to the top of the platform, how much GPE does he acquire?

Calculating GPE (convert units)

Worked example

The record for the highest hot air balloon flight is 21,027 m. At this height, the balloon had an estimated 735 MJ of GPE. What was the mass of the balloon?

* One megajoule is equal to 1,000,000 joules

Calculating GPE

Complete the GPE calculation worksheet.
You do not need to copy the questions

You must show your working out.
Set it out how you have just been shown.