Changes In Energy

Question 1

What is the equation for kinetic energy of a moving object?

Answer 1

Ek = 0.5mv2
Kinetic energy = 0.5✖️mass✖️(speed)2
Kinetic energy (Ek) = Joules (J)
Mass (M) = kilograms (Kg)
Speed (V) = metres per second (m/s)

Question 2

Elastic potential energy stored in a stretched spring - what is the equation?

Answer 2

Ee = 0.5ke2
Elastic potential energy = 0.5✖️spring constant✖️(extension)2
Elastic potential energy (Ee) = Joules (J)
Spring constant (K) = Newtons (N)
Extension (E) = Metres (M)

Question 3

How do you measure gravitational potential energy gained by an object raised above ground?

Answer 3

Ep = mgh
Mass✖️G.F.S✖️Height
Gravitational potential energy (Ep) = Joules (J)
Mass (M) = Kilograms (Kg)
Gravitational field strength (G) = Newtons per kilogram (N/Kg)
G.F.S (G), Height (H), Metres (M)

Question 4

What is Work Done and how is it calculated?

Answer 4

Work done is the amount of energy transferred to an object using a force 
Work done = energy transferred 
Work done (J) = Force applied (N)✖️Distance moved (M)

Question 5

What is power?

Answer 5

The rate at which energy is transferred or work is done
Power= energy transferred/time 
Power = work done/time
Power = potential difference x current
Power = (current)2 x resistance 
Power measured in Watts
Energy transferred and work done = Joules 
Time in seconds