Motion And Forces

Question 1

What is the equation for momentum?

Answer 1

Momentum = Mass x Velocity
p = m x v

Question 2

What is the equation for force?

Answer 2

Force = Change in momentum / Time taken for change
F = mv - mu / t

Or

F = m (v - u) / t

Question 3

What is Newton’s third law?

Answer 3

For every action there is an equal and opposite reaction

Question 4

What factors can after drivers reaction times?

Answer 4

• Tiredness
• Alcohol and drug use
• Distractions
• Age

Question 5

What is human reaction time?

Answer 5

The time between a stimulus occurring and a response

Question 6

What factors affect the braking distance?

Answer 6

• Icy or wet road
• Worn brakes or tires
• Mass of the car

Question 7

What does the slope of a velocity/time graph tell you?

Answer 7

Acceleration

Question 8

What does the area under a velocity/time graph tell you?

Answer 8

Distance travelled

Question 9

What is the typical speed of walking?

Answer 9

1.5 m/s

Question 10

What is the typical speed of running?

Answer 10

3 m/s

Question 11

What is the typical speed of cycling?

Answer 11

6 m/s

Question 12

What is the typical speed of driving?

Answer 12

13-30 m/s

Question 13

What is the typical speed of sound in air?

Answer 13

330 m/s

Question 14



Question 15

What is Newton’s first law?

Answer 15

A body will remain at rest or continue in a straight line at a constant speed as long as the force acting on it are balanced

Question 16

What is newton second law?

Answer 16

Resultant force = mass x acceleration

Question 17

What is acceleration in freefall?

Answer 17

10 m/s^2

Question 18

What is inertial mass?

Answer 18

A measure of how difficult it is to change the velocity of an object

Question 19

How do you define inertial mass?

Answer 19

The ratio of force over acceleration

Question 20

How can you measure human reaction time?

Answer 20

• Ruler drop test
• Metre ruler is held vertically, level with a persons finger and thumb
• The ruler is dropped and grasped by person
• They record the length they caught it at