1.2 motion

Question 1

Define speed

Answer 1

Distance travelled per unit time

Question 2

Equation of speed and its SI unit

Answer 2

speed = distance / time or v = s / t
m/s

Question 3

equation of average speed

Answer 3

average speed =total distance travelled / total time taken

Question 4

Define acceleration and deceleration

Answer 4

Acceleration is change in velocity per unit time
Deceleration is negative acceleration

Question 5

Equations for constant velocity

Answer 5

First equation
acceleration = change in velocity / time taken or
a = v-u / t
Second equation
average speed = u+v / 2

Question 6

acceleration of freefall

Answer 6

the acceleration of free fall g for an object near to the surface of the Earth is approximately
constant and is approximately 9.8m/s (square)