Mechanics - Work, Energy and Power (Module 10)

Question 1

Name some of the different types of Stores for Energy?

Answer 1

• Gravitational potential stores (position of objects in a gravitational field)
• Kinetic stores (moving objects)
• Thermal stores (hot objects)
• Elastic stores (compressed or stretched)

Question 2

Give some examples of how Energy can be Transferred?

Answer 2

• Through radiation (e.g. by light)
• Through electricity
• Through mechanically (e.g. by sounds)

Question 3

What is the Principle of Conservation of Energy?

Answer 3

Energy cannot be created or destroyed

Question 4

How do you calculate Work Done?

Answer 4

Work Done = force x distance moved in the direction of the force (W=fsCosθ)

Question 5

What part of the Force-Distance graph does the Work Done equal?

Answer 5

The Area underneath the line represents the work done

Question 6

How Do You Calculate Kinetic Energy?

Answer 6

Ek = 1/2 m v^2 (1/2 mass x velocity)

Question 7

How Do You Calculate Potential Energy?

Answer 7

GPE = mgh (mass x gravity x height)

Question 8

Define Work Done

Answer 8

It is a force due to one object making the other object move

Question 9

Define Heat Transfer

Answer 9

It is from a hot object to a cold object. Can be due to conduction, convection or radiation

Question 10

Define Power

Answer 10

Power is the rate of transfer of energy