The energy of an object in a gravitational field (E=mgh) | Physics

Starter quiz

Which of the following properties of an object affects the amount of energy in its gravitational store?
- height ✓
- mass ✓
- speed
- temperature
Why does a free–falling object accelerate downwards?
- energy is created in the kinetic store
- energy is lost from the gravitational store
- energy is transferred to the kinetic store ✓
- energy is transferred from the gravitational store ✓
A pupil lifts a box of books off the floor then puts it back down again. How much work is done (compared to the first time) if the box is lifted again to 4× the height?
- 16× more
- 4× more ✓
- the same amount
- 4× less
- 16× less
Which of the following is the unit of weight?
- kilograms (kg)
- newtons (N) ✓
- newtons per kilogram (N/kg)
- pounds (lb)
How would you calculate the work done lifting a sack of onions onto a table?
- work done = mass of the onions × height of the table
- work done = mass of the onions ÷ height of the table
- work done = weight of the onions × height of the table ✓
- work done = weight of the onions ÷ height of the table
The gravitational force on Earth is 6× greater than it is on the Moon. Starting with the one with the most energy, put the tools in order of decreasing energy in the gravitational store.
- 1
  
  ⇔
  
  A hammer has a mass of 2 kg and is on Earth.
- 2
  
  ⇔
  
  An axe has a mass of 1.5 kg and is on Earth.
- 3
  
  ⇔
  
  A drill has a mass of 3 kg and is on the Moon.
- 4
  
  ⇔
  
  An electric saw has a mass of 2 kg and is on the Moon.