Conservation and Dissipation of energy P1

Question 1

Name the 4 ways energy can be transferred by.

Answer 1

• mechanically
• electrically
• radiation
• heating

Question 2

What does the conservation of energy state?

Answer 2

energy cannot be created or destroyed

Question 3

Whats a closed system?

Answer 3

a system where no energy transfers happen out of / into the energy stores of the system

Question 4

energy transferred = ____ _____

Answer 4

work done

Question 5

What does the ‘work done’ depend on?

Answer 5

• size of the force
• distance moved

Question 6

What is the equation for work done?

Answer 6

Work done = force applied x distance moved

Question 7

Gravitational potential-
The work done when an object moved up and down depends on…

Answer 7

1) height change
2) weight

Question 8

Equation for change of gravitational potential energy store?

Answer 8

Change of gravitational energy store = mass x gravitational field strength x change of height

Question 9

Equation for kinetic energy

Answer 9

Kinetic energy = 1/2 x mass x speed2

Question 10

Equation for elastic potential energy.

Answer 10

elastic potential energy = 1/2 x spring constant x extension2

Question 11

What does the energy in a kinetic energy store of a moving object depend on?

Answer 11

Mass, speed