Forces and Motion

Question 1

relationship between average speed, distance and time taken

Answer 1

average speed - distance moved/time taken

Question 2

acceleration, change in velocity and time

Answer 2

acceleration - change in velocity/time taken

Question 3

explanation for time velocity graphs

Answer 3

shows the changing velocity of the sprinter or of any other moving person or object.

Question 4

velocity

Answer 4

the direction of the movement of the body or the object.

Question 5

relationship between final speed, initial speed, acceleration and distance moved

Answer 5

(final speed)(squared) = (initial speed) (squared) + (2 x acceleration x distance moved)

v2 = u2 (2 x a x s)

Question 6

different types of forces

Answer 6

Gravitational force.
Electric force.
Magnetic force.
Nuclear force.
Frictional force.
Electrostatic force.

Question 7

vector quantities

Answer 7

physical quantities characterised by the presence of both magnitude as well as direction.

Question 8

relationship between unbalanced force, mass and accelerationa;

Answer 8

force = mass x acceleration

Question 9

relationship between weight, mass and gravitational field strength:

Answer 9

weight = mass x gravitational field strength

Question 10

relationship between stopping distance, thinking and braking distance

Answer 10

stopping distance = thinking distance + braking distance

Question 11

forces acting on falling objects + explanation for why it reaches terminal velocity

Answer 11

gravity, the force of air resistance becomes large enough to balance the force of gravity (the change in velocity terminates as a result of the balanced forces)