Equations

Question 1

What is the equation for ‘work done (J)’?

Answer 1

Force applied (N) x distance (m)

Question 2

What is the quation for ‘change IN object’s gravitational potential enegy store’?

Answer 2

Weight (N) x change in height (m)

Question 3

What is the quation for ‘change OF object’s gravitational potential enegy store (J)’?

Answer 3

Mass (Kg) x gravitational field strength (N/Kg) x change in height (m)

Question 4

What is the equation for ‘kinetic energy (J)’?

Answer 4

1/2 x mass (Kg) x speed^2 (m/s^2)

Question 5

What is the equation for ‘elastic potential energy (J)’?

Answer 5

1/2 x spring constant (N/m) x extension^2 (m^2)

Question 6

What is the equation for ‘efficiency’?

Answer 6

Useful power out (W) / total power in (W) x 100

Question 7

What is the equation for ‘power (W)’?

Answer 7

Energy transferred (J) / time (s)

Question 8

What is the equation for ‘power wasted’?

Answer 8

Total power in - useful power out