Topic 8 Energy- Forces Doing Work

Question 1

What is the equation for work done?

Answer 1

Work done= force x distance moved in the direction of the force

Question 2

What is the equation for power?

Answer 2

Power= work done/ time taken

Question 3

How can energy be changed through work done through forces?

Answer 3

A body can be lifted through a vertical height by a force. This increases the store of gravitational potential energy

Question 4

How does energy change in a system through electrical equipment?

Answer 4

A cell in a circuit provides a potential difference so that components in the circuit can transfer energy into other forms, such as thermal energy

Question 5

How can energy be changed through heating a material?

Answer 5

Supplying thermal energy to a system will increase the kinetic energy of the particles in the material.

Question 6

What is the equation for the gravitational potential energy?

Answer 6

Gravitational potential energy= mass x gravitational field strength x height

Question 7

What is the equation for kinetic energy?

Answer 7

Ke= 1/2 x mass x velocity(squared)

Question 8

What is the equation for efficiency?

Answer 8

Efficiency= useful energy transferred/ total energy supplied x 100%