Forces & Motion

Question 1

What is the typical walking speed?

Answer 1

1.5 m/s

Question 2

What is the typical speed of sound?

Answer 2

330 m/s

Question 3

Equation for speed?

Answer 3

Speed (m/s) = distance (m) / time (s)

Question 4

Equation for acceleration?

Answer 4

acceleration (m/s2) = Change in Velocity (m/s) / time (s)

Question 5

What are the three Newton’s Laws?

Answer 5

1. If the resultant force on a stationary object is zero, the object will remain stationary. If the resultant force on a moving object is zero, it. will carry on moving at the same velocity.
2. Resultant Force (N) = mass (kg) x acceleration (m/s2)
3. When two objects interact, the forces they exert on each other are equal and opposite.

Question 6

Equation for stopping distance?

Answer 6

Stopping Distance = thinking distance + breaking distance

Question 7

How might an individuals ‘thinking time’ be increased?

Answer 7

Alcohol, tiredness, drugs

Question 8

How might an individuals ‘breaking time’ be increased?

Answer 8

Wet roads, bald tyres.

Question 9

How do calculate Acceleration on a velocity-time graph?

Answer 9

Calculate the gradient
(Gradient = change in velocity / time)

Question 10

What does a diagonal line sloping up mean on a velocity-time graph?

Answer 10

Constant Acceleration

Question 11

What does a horizontal line mean on a velocity-time graph?

Answer 11

Constant Velocity/Stationary

Question 12

What does a diagonal line sloping down mean on a velocity-time graph?

Answer 12

Constant Deceleration