September Exams Equations

Question 1

Kinetic energy

EQ sheet

Answer 1

Kinetic energy (J) = 0.5 x mass (kg) x (speed)^2
Ek = 0.5 x m x v^2

Question 2

Elastic potential energy

Answer 2

Elastic potential energy (j) = 0.5 x spring constant (N/m) x (extension)^2 (m)
Ee = 0.5 x k x e

Question 3

Gravitational potential energy

EQ sheet

Answer 3

Gravitational potential energy (j) = mass (kg) x gravitational field strength (N/kg) x height (m)
Ep = m x g x h

Question 4

Potential difference

Answer 4

Potential difference (v) = current (A) x resistance (ohms)
V = I x r

Question 5

Power (energy transfer)

Answer 5

Power (watts) = energy (j) / time (s)

P = e /t

Question 6

Power (work done)

EQ sheet

Answer 6

Power (w) = work done (j) / time (s)

P = w / t

Question 7

Resultant force

Answer 7

Larger force - smaller force

Question 8

Pressure

EQ sheet

Answer 8

Pressure = Force / area
P = f / a

Question 9

Acceleration (non-uninform)

EQ sheet

Answer 9

Acceleration (m/s^2) = change in velocity (m/s) / time (s)

A = 🔺v / t

Question 10

Acceleration (uniform)

Answer 10

(Final velocity)^2 - (initial velocity)^2 = 2 x acceleration (m/s^2) x distance (m)

V^2 - u^2 = 2 x a x s (diStance)

Velocity = m/s

Question 11

Force

Answer 11

Force (N) = mass (kg) x acceleration (m/s^2)

F = m x a