MOTION

Question 1

DISTANCE TIME GRAPHS

FASTER THE SPEED?

OJECT IS STATIONARY?

OBJECT IS AT A CONSTANT SPEED?

Answer 1

Steeper the gradient.

Horizontal.

Straight line sloping upwards.

Question 2

FORMULA FOR DISTANCE TIME GRAPHS.

CALCULATING SPEED ON A DISTANCE TIME GRAPH.

Answer 2

Speed m/s = distance m / time s

Draw a triangle on graph - gradient = height / base

Question 3

WHAT IS VELOCITY

Answer 3

A vector - it has direction as well as magnitude. If an object changes direction it changes velocity even if the speed stays the same.

Question 4

WHAT IS ACCELERATION?

WHAT IS DECELERATION?

Answer 4

If the velocity changes.

Slowing down. Negative acceleration.

Question 5

WHAT IS THE RESULTANT FORCE?

Answer 5

Resultant force is needed to make an object accelerate.

If resultant is 0 object is stationary or has a constant speed.

Question 6

WHAT IS A VECTOR? EXAMPLES?

WHAT IS A SCALAR? EXAMPLES?

Answer 6

Vectors have direction and size. Velocity, acceleration, force, momentum, weight.

Scalars are not directional. Speed, distance, time, mass, energy.

Question 7

WHAT IS THE STOPPING DISTANCE?

Answer 7

Distance vehicle travels between the driver noticing the hazard and the vehicle stopping.

Question 8

EFFECTS ON THINKING DISTANCE

EFFECTS ON BRAKING DISTANCE

Answer 8

Tiredness, drugs/medicine, alcohol, mobile phone use.

condition of brakes, mass of car, tyre condition, road condition.