P3 - Forces and motion

Question 1

What is the formula for force?

Answer 1

Force = mass X acceleration.

Question 2

If a car has a mass of 1000kg, what is the force needed to give it an acceleration of 4m/s^2?

Answer 2

Force = mass X acceleration

1000 X 4 = 4000N

Question 3

What causes a constant speed?

Answer 3

When the forces acting on an object are balanced.

Question 4

What is the unbalanced force equal to?

Answer 4

The forward force - the backward force.

Question 5

What is thinking time?

Answer 5

The time taken for a driver to react to danger.

Question 6

What is braking distance?

Answer 6

Braking distance is the distance travelled before the car comes to a stop after breaks have been applied.

Question 7

What is stopping distance?

Answer 7

Stopping distance = thinking distance + braking distance

Question 8

If thinking distance is 2m and the breaking distance is 6m, what is the stopping distance?

Answer 8

Stopping distance = thinking distance + braking distance

2 + 6 = 8m

Question 9

What can affect thinking time?

Answer 9

• tiredness
• under influence of drugs and alcohol
• distractions

Question 10

What can affect braking distance?

Answer 10

• road conditions
• quality of breaks
• speed of car