Topic 2: Motion and Forces

Question 1

What is the equation for average speed?

Answer 1

Average speed = Total distance ÷ Total time.

Question 2

What is the difference between velocity and speed?

Answer 2

Speed is scalar; velocity is vector and includes direction.

Question 3

What is the typical acceleration due to gravity on Earth?

Answer 3

9.8 m/s².

Question 4

How do you calculate momentum?

Answer 4

Momentum = Mass × Velocity (p = mv).

Question 5

State Newton’s Second Law of Motion.

Answer 5

Force = Mass × Acceleration (F = ma).

Question 6

What is the formula for stopping distance?

Answer 6

Stopping distance = Thinking distance + Braking distance.

Question 7

What factors affect thinking distance?

Answer 7

• Reaction time
• Speed of the vehicle

Question 8

What factors affect braking distance?

Answer 8

• Road condition
• Tire condition
• Speed
• Brake quality

Question 9

What is terminal velocity?

Answer 9

The maximum velocity reached by an object when the force of gravity is balanced by air resistance.

Question 10

What is meant by a resultant force?

Answer 10

A single force that has the same effect as all the forces acting on an object combined.