Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Table of Contents
A: Forces in all directions
Forces
Contact forces
B: How things start moving
C: Friction
Friction
The limit
D: Reaction of surfaces
Gravity
A reaction of a surface
E: Adding forces
Resultant force
F: How fast are you going?
Average speed
Instantaneous speed…read more

Page 3

Preview of page 3

Here's a taster:

G: Picturing motion
Distance-time graphs
Speed-time graphs
Tachographs
Velocity-time graphs
H: Force, interaction and momentum
Momentum
Change of momentum
I: Car safety
J: Laws of motion
Driving forces
Counter-forces
K: Work and energy
Work
Gravitational potential energy
Kinetic energy
Conservation of energy…read more

Page 4

Preview of page 4

Here's a taster:

A: Forces in all directions
Forces are needed to change the motion of an object, and are the pushes and pulls
experienced by an object when it interacts with another.
Forces can be represented by an arrow.
Forces arise from interactions between two objects.
Forces always come in pairs, called interaction pairs, that are:
1. Equal in size
2. Opposite in direction
3. Have two objects that act on different objects
Contact forces arise from when two objects touch one another.…read more

Page 5

Preview of page 5

Here's a taster:

B: How things start moving
Rockets use the force from burning hot gases to move.
Jet engines work similarly to rockets, but with air instead of burning hot gases.
Cars need to grip the surface to exert a force on it, thus making an equal force forwards.
When you walk, your feet exert a backward force on the surface to move you forward,
so it is more difficult to walk on icy surfaces.…read more

Page 6

Preview of page 6

Here's a taster:

C: Friction
Friction is the force exerted on an object due to the interaction between it and
another object that is sliding over it that is caused by the roughness of both surfaces.
Friction adjusts its size in response to the situation up to a limit.
The limit depends on the objects and surfaces involved.…read more

Page 7

Preview of page 7

Here's a taster:

D: Reaction of surfaces
Gravity causes objects to fall towards the centre of the Earth however this can be
cancelled out by a surface exerting an opposite force on the object.
A reaction of a surface is when a hard surface exerts an upward force when
something presses it.
Surfaces break when its limit is reached; it can no longer exert an equal force on the
object that is pressing it down.…read more

Page 8

Preview of page 8

Here's a taster:

E: Adding forces
If there is a force on an object, but the object is not moving, there must be another force
cancelling it out.
If forces balance each other, they are said to add to make zero.
Resultant force is the sum of all the forces acting on an object, considering their
directions.…read more

Page 9

Preview of page 9

Here's a taster:

F: How fast are you going?
Average speed can be calculated using the equation:
o Speed = distance
time
Average speed is not always useful, because in reality, during most journeys the speed
varies.
Instantaneous speed is the speed at a particular moment in time, and is
calculated by working out the average speed over a very short period of time.
Speedometers are used in cars to work out how fast the vehicle is going by calculating
the cars instantaneous speed.…read more

Page 10

Preview of page 10

Here's a taster:

G: Picturing motion
Distance-time graphs show how far an object is from its starting point at every
moment of the journey.
On a distant-time graph:
o Horizontal lines represent no movement
o Straight lines represent a steady speed
o Curved lines represent a change in speed; sloping up curves represent
acceleration, whereas levelling curves represent deceleration
o The origin represents the start, before the journey has started
Speed-time graphs show the speed of a moving object at every instant in its
journey.…read more

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all resources »