P1 - Conservation and Dissipation in Energy

Question 1

What is the ‘Law of Conservation of energy’?

Answer 1

-Energy cannot be created or destroyed

Question 2

What is the work done equation?

Answer 2

-Work done = Force x Distance

Question 3

What are the main four energy transfers?

Answer 3

• Mechanically
• Electrically
• By radiation
• By heating

Question 4

What are the eight energy stores?

Answer 4

• Magnetic
• Thermal
• Chemical.
• Kinetic.
• Electrostatic.
• Elastic potential.
• Gravitational potential.
• Nuclear.

Question 5

How to calculate the elastic potential energy?

Answer 5

-0.5 x spring constant x extension^2

Question 6

How do you calculate the change in the GPE store?

Answer 6

-Weight x gravitational field strength x change in height

Question 7

How do you work out the kinetic energy?

Answer 7

-0.5 x mass x velocity

Question 8

What is useful energy?

Answer 8

-Energy transferred to where it is wanted in the way that it is wanted

Question 9

What is wasted energy?

Answer 9

-Energy that is not usefully transferred.

Question 10

What is the efficiency equation?

Answer 10

-Useful output energy / total input energy x 100

Question 11

What is the power equation?

Answer 11

-Energy transferred / time taken