P1

Question 1

How to calculate Kinetic energy?

Answer 1

kinetic energy = 0.5 × mass × speed ^2
Ek = 0.5mv^2

Question 2

How to calculate elastic energy?

Answer 2

elastic potential energy = 0.5 × spring constant × extension^2
Ee = 0.5ke^2

Question 3

How to calculate gravitational potential energy?

Answer 3

g . p . e . = mass × gravitational field strength × height
gpe = mgh

Question 4

What are the units for the spring constant?

Answer 4

N/m

Question 5

What are the units for gfs?

Answer 5

N/kg

Question 6

Power definition?

Answer 6

Power is defined as the rate at which energy is transferred or the
rate at which work is done.

Question 7

What are the equations for Power?

Answer 7

Power = current x Voltage
Power= Current ^2 x Resistance

Question 8

Efficiency equations?

Answer 8

Efficiency = useful output energy / total input energy x 100
Efficiency = useful power output / total power input x 100

Question 9

Ways of reducing wasted energy transfers?

Answer 9

• Lubrication: prevents kinetic energy from being shifted into thermal energy due to the force of friction
• Insulation: prevents energy being lost as insulation has a low thermal conductivity, so, insulation transfers the thermal energy through the material slowly

Question 10

Work done equation?

Answer 10

Work done = force x distance

Question 11

Non-renewable sources definition?

Answer 11

Energy resources that will eventually run out

Question 12

Renewable energy sources definitions?

Answer 12

Energy resources which can be replaced as they are used

Question 13

Non - Renewable resources?

Answer 13

• Fossil Fuels: Coal, oil, gas
• Nuclear

Question 14

Renewable Energy Sources?

Answer 14

• Wind
• Biofuel
• Hydroelectricity
• Geothermal
• Tidal
• Solar
• Wave

Question 15

How does a fossil fuel/biofuel station generate electricity?

Answer 15

Fuel is burnt to heat water which turns to steam which powers the generator to generate electrcity

Question 16

What are the energy stores?

Answer 16

• Magnetic & Electric: Electromagnetic field
• Elastic: Stretching
• Nuclear: Atoms
• Gravitational Potential: Height
• Thermal: Radiation
• Chemical: Food
• Kinetic: Moving
• Vibrational: sound

Question 17

Energy Pathways?

Answer 17

• Light, sound, heating, electric current
• Carry energy from one store to another

Question 18

Specific Heat Capacity explained…

Answer 18

• The larger the heat capacity, the more SHC
• If an object can store more heat, it will loose it slower

Question 19

Hooks law?

Answer 19

• When mass is added to a spring, it applies a force which causes the spring to change shape and extend, now having energy in its elastic energy store
• Hooks law states that Force is directly proportional to the Extension
• And if shown as a graph, the gradient would be the spring constant