1.        F/H

Describe the motion shown by the following graphs:

(a)  Distance		(b) Distance
	Time		Time

(a) stopped

(b) steady speed

2.        F/H

Sketch a distance / time graph for something moving with a greater speed than (b) above

3.        F/H

What is the formula that connects speed, time and distance?

speed =  distance / time

4.        F/H

If a car goes 200m in 10 seconds - what is it's speed?

20m/s

5.        F/H

What is the difference between velocity and speed?

The velocity of an object is its speed in a given direction.

6.        F/H

Sketch the shape of a velocity / time graph for an object:

(a) with constant velocity

(b)  with constant acceleration

7.       F/H

Describe the difference between in the motion between these two graphs:

(a) Velocity		(b) Velocity
	time		time

(a)  is accelerating less than (b)

OR (b) has greater acceleration

8.        F/H

(a) What is the formula that connects acceleration, velocity and time?  (b)  If an object speeds up from 20m/s to 100m/s in 4s, what is it's acceleration?

(a) a = change in velocity / time taken    (b)  a = (100-20)/4 = 20m/s/s

9.        H

What does the gradient of distance time graph tell us?

It's speed

10.     H

(a) What does the gradient of a velocity/time graph tell us?  (b) what does the area under the graph tell us?

(a) acceleration  (b) distance

11.     H

Sketch a velocity time graph for the following data:

 an object that goes from 2m/s to 10m/s in 4s 

use the graph to calculate:

(a) the acceleration of the object

(b) the distance traveled by the object.

Gradient = 4m/s/s = acceleration

Area = 24m = distance

12.     F/H

When an object is at rest on a surface - what can you say about the forces on it?

The cancel each other out (balance)

13.     F/H

For the above: What force acts downwards on the surface?

the weight

14.     F/H

For the above: What force acts upwards?

A reaction force (the surface pushing upwards on the object)

15.     F/H

For the above: What can you say about the size of the two forces

They are the same

16.     F/H

When two bodies interact (push on each other) the forces they exert on each other are ______ and _________.

equal, opposite

17.     F/H

_________ forces will have no effect on the movement of an object

balanced

18.     F/H

When an object is not moving what effect will a balanced force have on the object?

it will remain stationary

19.     F/H

When an object is moving - what effect will a balanced force have on the object?

it will continue to move at the same speed and in the same direction

20.     F/H

__________ forces are forces on an object that do not cancel out

unbalanced

21.     F/H

How an unbalanced force affect an object can depend on two things  - what are they?

the direction and the size of the unbalanced force:

22.     F/H

Describe the motion of a stationary object if an unbalanced force acts on it

It will start to move  in the direction of the force.  It will speed up in the direction of the unbalanced force.

23.     F/H

Describe the motion of a moving object if an unbalanced force acts on it.

An object moving in the direction of the force will speed up.  An object moving in the opposite direction to the force will slow down

24.     F/H

How does the size of the unbalanced force affect the way the object will speed up or slow down?

the greater the size of the unbalanced force, the faster the object will speed up or slow down

25.     F/H

How will the mass of the object affect the way it speeds up or slows down?

The bigger the mass of an object, the greater the force needed to give the object a particular acceleration

26.     H

What is a newton?

The unit of force.  It is the  force  needed  to  give a  mass of one kilogram an  acceleration of  one metre per second squared.

27.     H

How are force mass and acceleration related?

F  =  m x a

28.     F/H

A force of _______ acts when an object moves through air or water

friction

29.     F/H

A force of _________ acts when solid surfaces slide (or tend to slide) across each other

friction

30.     F/H

The direction of friction is always ________ to the direction in which the object is moving

opposite

31.     F/H

The friction between solid surfaces is used in ________ which slow down and stop moving vehicles

brakes

32.     F/H

33.     F/H

The greater the speed of a vehicle:

the ________ the braking force needed to stop it in a certain distance

the _______ the distance needed to stop it with a certain braking force

greater

greater

34.     F/H

If too great a braking force is applied, friction between a vehicle's tyres and the road surface may not be great enough to prevent _________

skidding

35.     F/H

What 2 things does the stopping distance of a vehicle depends on?

(1) the distance the vehicle travels during the driver's reaction time (2) the distance the vehicle travels under the braking force

36.     F/H

What does overall stopping distance depend upon? (4 things)

speed of vehicle, driver's reactions (due to tiredness, drugs, alcohol), if there are adverse weather conditions (wet/icy roads, poor visibility), if the vehicle is poorly maintained (e.g. worn brakes/tyres).

37.     F/H

When an object is moving faster through a fluid - how does this affect the force of friction on it?

the force of friction increases if the objects is moving faster

38.     F/H

Explain why objects have "terminal velocity" when they fall

When a body falls: initially it accelerates due to the force of gravity

frictional forces increase until they balance the gravitational forces;

the resultant force eventually reaches zero and the body fall at its terminal velocity.

39.     F/H

If an object has steady speed - what can we say about the frictional forces and the driving force?

they balance out