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Flashcards in P2 2 Forces Deck (11):
1

What can a force do?

  • Change the shape of an object
  • Change its state of rest
  • Change its motion

2

What is there always when there's two forces against each other?

They exert equal and opposite forces on one another.

3

What is the unit of forces?

Newtons (N)

4

What is the force that makes an object move known as?

An engine force or a motive force.

5

When forces are balanced, what happens to the speed?

It remains constant

6

When are forces balanced?

When they are of the same size and act in opposite directions of an object.

7

What is thinking distance?

When a driver sees something on the road it takes a short time to realise they need to stop. The distance travelled is the thinking distance.

8

What is braking distance?

Once the driver has started to break, the distance the car travels to stop is called the braking distance.

9

What is stopping distance?

The total distance (the sum of the thinking and braking distance)

10

What factors increase the brake time?

  • The speed
  • Quality of brakes
  • Tyres
  • Road surface
  • Weather conditions

11

What are the factors that will affect the driver's reaction time?

  • The speed
  • The mental state of the driver eg. drugs, sleep, careless attitude