Physics Motion and Force Topic-Key Knowledge

Question 1

Formula for acceleration?

Answer 1

Change in velocity/time

Question 2

Formula for resultant force?

Answer 2

Fres= mass x acceleration

Question 3

Stopping distance

Answer 3

Thinking distance + braking distance

Question 4

Formula for speed?

Answer 4

Distance/Time

Question 5

Scalar

Answer 5

A quantity with size only
- number + unit, e.g 3kg, 14*C

Question 6

Vector

Answer 6

Quantity with size and direction
- number + unit + direction, e.g 1N left

Question 7

Formula for weight?

Answer 7

Mass x gravitational force (10)

Question 8

Terminal velocity

Answer 8

Resultant force = 0 because weight = air resistance, object has reached a constant speed

Question 9

Thinking distance

Answer 9

Distance travelled during your reaction time

Question 10

Formula for pressure?

Answer 10

Pressure (N/cm^2)=force (N)/area

Question 11

Pressure change in fluids?

Answer 11

Change in pressure = density (kg/m^3) x gravitational field strength (N/kg) x change in height/depth (m)

Question 12

Density

Answer 12

-Mass per unit volume
-Density = mass/volume