Physics equations

Question 1

momentum

Answer 1

momentum (kg m/s) = mass (kg) × velocity (m/s)

p = mv

Question 2

force (using the rate of change of momentum)

Answer 2

Force (N) = change in momentum (kg m/s) ÷ time taken (s)

F = (mv - mu) ÷ t

or

F = m(v - u) ÷ t

Question 3

acceleration

Answer 3

acceleration (m/s²) = change in velocity (m/s) ÷ time taken (s)

a = (v - u) ÷ t

Question 4

weight

Answer 4

weight (N) = mass (kg) × gravitational field strength (N/kg)

W = m × g

Question 5

inertial mass

Answer 5

ratio of force ÷ acceleration

Question 6

speed

Answer 6

speed (m/s) = change in distance (m) ÷ time taken (s)

s = d ÷ t

Question 7

force (and acceleration using force)

Answer 7

F = m × a

acceleration (m/s²) = force (N) ÷ mass (kg)

a = F ÷ m