Energy transfer

Question 1

Describe energy transfer of a vertical drop ride at an amusement park as it falls

Answer 1

-Energy in the gravitational store is transferred to kinetic store mechanically.

-Thermal energy is also transferred to the surroundings by radiation.

Question 2

What is meant by the term ‘specific heat capacity’

Answer 2

The energy to change temperature by 1C per Kg of mass.

Question 3

How to improve accuracy of measuring specific heat capacity

Answer 3

-Repeat the experiment and calculate the mean average to deduce any anomalies

-Use a polystyrene cup as it’s an insulator

-Place a lid over container to prevent heat bein lost to surroundings

Question 4

Describe energy stores and transfers between turbine and generator

Answer 4

-The turbine has a kinetic store
-Turbines transfer their energy mechanically to the generator
-The generator spins and so gains kinetic energy.

Question 5

Disadvantages of wind turbines

Answer 5

-Noise pollution
-Visual Pollution
-They require a large amount of land to be efficient.

Question 6

Which energy store decreases in Geothermal power stations?

Answer 6

Thermal energy

Question 7

Which energy store decreases in Hydroelectric power station?

Answer 7

Gravitational potential

Question 8

Which energy store decreases in Petrol generators?

Answer 8

Chemical energy

Question 9

Which energy store decreases in Wind turbines?

Answer 9

Kinetic energy

Question 10

Explain how conduction occurs between metals and a flame

Answer 10

-The kinetic energy is transferred from the flame to it’s neighbouring surroundings

-The particles vibrate, the increase in kinetic energy means the vibrations increase in speed.

Question 11

When something is changing state, what happens to it’s kinetic energy store?

Answer 11

-It remains constant as Kelvin is directly proportional to the KE of particles

-The KE doesn’t change.