2.1 DISTANCE, SPEED AND ACCELERATION

Question 1

WHAT IS A SCALAR QUANTITY?

Answer 1

A quantity with magnitude only

Question 2

WHAT IS A VECTOR QUANTITY?

Answer 2

A quantity with magnitude and direction

Question 3

WHAT IS THE EQUATION FOR SPEED?

Answer 3

Speed = Distance / Time

Question 4

WHAT IS THE EQUATION FOR VELOCITY?

Answer 4

Velocity = Displacement / Time

Question 5

WHAT IS THE EQUATION FOR ACCELERATION?

Answer 5

Acceleration = Change in Velocity / Time

Question 6

WHAT CAN A DISTANCE TIME GRAPH BE USED FOR?

Answer 6

1. Describe the motion of an object
2. Calculate the speed of an object

Question 7

WHAT DOES A LINE SLOPING UPWARDS MEAN ON A SPEED-TIME GRAPH?

Answer 7

Increasing speed (object is accelerating)

Question 8

WHAT DOES A LINE SLOPING DOWNWARDS MEAN ON A SPEED-TIME GRAPH?

Answer 8

Decreasing speed (object is decelerating)

Question 9

WHAT DOES A HORIZONTAL LINE MEAN ON A SPEED-TIME GRAPH?

Answer 9

Constant speed

Question 10

WHAT IS THE EQUATION FOR ‘DISTANCE TRAVELLED’?

Answer 10

Area under a velocity-time graph

Question 11

WHAT IS THINKING DISTANCE?

Answer 11

The distance the vehicle travels when the driver is reacting

Question 12

WHAT IS BREAKING DISTANCE?

Answer 12

The distance the vehicle travels after the brakes have been applied.

Question 13

WHAT IS REACTION TIME?

Answer 13

The time is takes a driver to recognise and react to a hazard and apply the brakes.

Question 14

WHAT ARE THE FACTORS THAT AFFECT THINKING DISTANCE?

Answer 14

• tiredness
• under the influence of alcohol or drugs
• distractions

Question 15

WHAT ARE THE FACTORS AFFECTING BREAKING DISTANCE?

Answer 15

• The condition of the brakes
• The condition of the tyres
• The condition of the road surface
• The mass of the vehicle
• The speed of the vehicle