Energy: Example Energy Transfers

Question 1

What is the law of conservation of energy?

Answer 1

Energy can be transferred usefully, stored or disappated but it cannon be created or destroyed.

Question 2

Why will a pendulum gradually come to a stop?

Answer 2

• there will be friction on the fixed point on which the pendulum swings and also friction between the air and the pendulum as it passed through the air particles
• friction causes energy to be transferred to thermal energy
• this energy has been disappated
• this will cause the pendulum to gradually swing with less energy eventually coming to a stop

Question 3

How can friction on a pendulum be reduced?

Answer 3

• use of a lubricant on the fixed point
• by removing the air particles from around the pendulum

Question 4

When the pendulum swings to its maximum height, how much gravitational potential and kinetic energy will it have in its stores?

Answer 4

• maximum GPE
• minimum kinetic

Question 5

What energy is transferred as the pendulum swings back to its resting position?

Answer 5

GPE is transferred to kinetic energy

Question 6

What energy will th pendulum have at its resting point?

Answer 6

• maximum kinetic energy
• minimum GPE

Question 7

As the pendulum swings back to its highest piint, what energy is transferred?

Answer 7

Kinetic is transferred to GPE