P2.1 Forces and their effects(2) Flashcards
1
Q
What do resistive forces do to a vehicle moving at a steady speed?
A
Resistive forces BALANCE the driving forces
2
Q
What are resistive forces caused by?
A
Air resistance
3
Q
What two factors do a greater speed affect and how?
A
Needs a greater braking force
Needs a greater stopping distance
4
Q
Give at least 3 factors that increase reaction time (out of 4)
A
- Tiredness
- Drugs
- Alcohol
- Distractions
5
Q
Why does the temperature of brakes increase? (4 marks)
A
- WORK DONE
- by the FRICTION force
- between BRAKES and WHEEL
- reduces kinetic energy of vehicle
6
Q
Give two examples of ‘adverse road conditions’
A
- Wet roads
- Icy roads
7
Q
What two physical factors can increase braking distance
A
- Poor brakes/tyres
- Adverse road conditions
8
Q
What one thing can be done to increase braking force and stopping distance?
A
Travel at a greater SPEED
