1.2 Conservation of energy

Question 1

What is the principle of the conservation of energy

Answer 1

Energy cannot be created or destroyed

Question 2

What is a closed system

Answer 2

System where no energy is transferred to or from the surroundings, total energy stays same

Question 3

Why kinetic energy is transferred to thermal energy normally

Answer 3

Friction

Question 4

What happens to a rollercoaster as it’s going up

Answer 4

Gravitational store increases

Question 5

What happens when rollercoaster is going down

Answer 5

Gravitational potential energy store decreases. Transferred to kinetic energy which increases. Energy transferred to thermal energy f surroundings by air resistance and friction, energy transferred by sound waves

Question 6

What is a system

Answer 6

an object or groups of objects

Question 7

Describe the energy transfer when a moving car slows down

Answer 7

Energy is transferred mechanically from the kinetic store of the car to the thermal store of its brakes some energy is dissipated to the thermal store of the surroundings

Question 8

Describe the energy tranferred when a ball is fired using an elastic band

Answer 8

Energy is transferred mechanically from the elastic store of the elastic band to the kinetic store of the band some energy is dissipated to the thermal store of the surroundings