2 - Forces and motion

Question 1

What is the formula for average speed?

Answer 1

average speed (v) = distance moved (s) / time taken (t)

Question 2

What are vectors and scalars?

Answer 2

Scalars are quantities which only have a magnitude, scalars are quantities which have both a magnitude and a direction

Question 3

What is the formula for average acceleration?

Answer 3

average acceleration (a) = change in velocity (Δv) / time taken (Δt)

Question 4

Is acceleration a vector or a scalar?

Answer 4

Acceleration is a vector

Question 5

What information can be gained from distance-time and speed-time graphs?

Answer 5

On distance-time graph, gradient of line is equal to speed; on speed-time graph, gradient of line is equal to acceleration, area under line is equal to distance travelled

Question 6

When does a velocity-time graph look the same as a speed-time graph?

Answer 6

When there is no change in the direction of motion

Question 7

If the height of the fall is h and the time taken is t, the acceleration of free fall (g) can be calculated with which equation?

Answer 7

g = 2h / t^2

Question 8

What is the difference between uniform and non-uniform acceleration?

Answer 8

Uniform acceleration means acceleration is constant, so velocity changes at a steady rate; non-uniform acceleration is when velocity changes, but at different rates