P9 Speed, Velocity, Motion

Question 1

To find the average speed of an object:

Answer 1

Distance / time taken

Question 2

To find distance travelled:

Answer 2

Speed x time

Question 3

To find the time taken for journey:

Answer 3

Distance / speed

Question 4

Collision speed if to objects move in opposite directions:

Answer 4

Object 1’s speed + object 2’s speed

Question 5

To calculate acceleration:

Answer 5

Change in velocity / time taken

Question 6

To calculate acceleration due to gravity:

Answer 6

Gravitational field strength x time taken = final speed.

Question 7

Newton’s second law of motion

Answer 7

The acceleration of a body is directly proportional to the applied force and inversely proportional to its mass

Question 8

Newton’s third law of motion

Answer 8

To every action there is a an equal and opposite reaction.

E.g. Action: Air is blown out of the jet engines at high speed.
Reaction: the aircraft moves forward.

Question 9

Formula to find acceleration without using time taken

Answer 9

V^2 = U^2 + 2aS

Final velocity^2 = initial velocity^2 + 2 x acceleration x distance ( displacement)