Energy is a key principle in physics. Forces cause changes and energy calculations allow us to measure how much change can happen.
Which is a correct example of work being done?
An apple sitting still on a table
A shelf holding up a book
A toy car being pushed across the floor
What is the gravitational field strength of Earth?
What are the correct units for work?
Work is measured in joules (J)
Work is measured in amps (A)
Work is measured in newtons (N)
How much work is done by a 10 N force pushing a box 4 m across the floor?
If a motor does 500 J of work to lift a 200 N weight, how high was the weight lifted?
A spring extends elastically by 10 cm when a force of 20 N is applied to it. What force would be needed to extend the spring by 5 cm?
Which word describes an object that will return to its original shape when forces are removed?
What is the weight of a 40 kg child on Earth (g = 9.8 N/kg)?
What is the gravitational potential energy stored in a 60 kg child sitting at the top of a 2 m high slide? (g = 10 N/kg)
How much energy is stored in a spring that has been stretched 5 cm? ( The spring constant for this spring is 10 N/m)