# 3.1 Motion Flashcards

How is speed calculated?

Distance / time

How is velocity calculated?

Displacement / time

How is acceleration calculated?

(v - u) / t

How is average speed calculated from a distance-time graph?

The gradient of a straight line drawn from the lowest to the highest point of the curve

How is instantaneous speed calculated from a distance-time graph?

Tangent drawn to the curve at a given point

What does the gradient of a displacement-time graph represent?

Velocity

What is acceleration?

The rate of change of velocity

What does negative acceleration mean? (2)

Slowing down

Acceleration in the opposite direction

What does the gradient of a velocity-time graph represent?

Acceleration

What does the area beneath a velocity-time graph represent?

Displacement

What is stopping distance? (2)

The total distance travelled before stopping

Thinking + braking

What is thinking distance? (2)

The distance travelled as the driver reacts

Uses s = d/t

What is braking distance? (2)

The distance travelled whilst braking

Uses suvat

What factors affect thinking distance? (5)

Age Drugs Visibility Distractions Alcohol

What factors affect braking distance? (5)

Brakes Grip of tyres Quality of car Weather Surface of the road