Phys PCT 2 Revision ( P2)

Question 1

Energy Resources

Topic review

Answer 1

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Question 2

what are the renewable resources

Answer 2

• Wind
• Tidal
• Wave
• Biofuels
• Geothermal
• Solar
• Hydroelectric

Question 3

what are the non - renewable resources

Answer 3

• Natural Gas
• Coal
• Nuclear Power
• Oil

Question 4

Work

topic Review

Answer 4

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Question 5

What’s the Formula of work done ?

Answer 5

work done (J) = force (N) × distance moved in the direction of the force (m)

Question 6

Kinetic Energy
- The quantity of kinetic energy in a moving object depends on how fast it is travelling (the velocity) and on the mass of the object

Answer 6

K.E = 1/2 x M x V^2

M = 2 E / V ^2

V = √2E/m

K.E = kinetic Energy , M = Mass ( kg) , V = Velocity ( m/s^2

Question 7

what’s the formula of Gravitational Potential Energy

Answer 7

G.P.E. (J) = mass (kg) × acceleration of gravity (m/s2) × change in height (m)

G.P.E. = G.P.E. = mg∆h

Question 8

The quantity of gravitational potential energy (G.P.E.) depends on several factors:

Answer 8

the gravitational field strength, g (as it involves lifting objects upwards against gravity)

the change in height, ∆h (this will affect how much energy is stored)

Question 9

What’s the formula to calculate power

• Power is defined as the energy transferred per unit of time.

Answer 9

P = △E/T