Work and Energy

Question 1

What is the definition of 1 joule?

Answer 1

One joule is the work done when a force of 1 newton moves an object through a distance of 1 metre.

Question 2

What is the principle of the conservation of energy?

Answer 2

Energy cannot be created or destroyed. Energy can be transferred from one form to another but the total amount of energy in a closed system will not change.

Question 3

What is the equation for efficiency?

Answer 3

Efficiency = Useful power output/ power input.

Question 4

What are the two equations for kinetic energy?

Answer 4

E = 1/2mv²

E = p²/2m

Question 5

What is the equation for elastic potential energy?

Answer 5

E = 1/2kx²