Pages in this set

Page 1

Preview of page 1
EXAM:
Wednesday 20th
May [PHYSICS UNIT 3 REVISION NOTES]




Moments
A moment is the turning effect of a force.
Even if the forces acting on a body are balanced in the sense that they do not cause
the body to change speed, they can still make the body turn.
moment…

Page 2

Preview of page 2
EXAM:
Wednesday 20th
May [PHYSICS UNIT 3 REVISION NOTES]




Balance and Stability
If the total anticlockwise moments do not equal the total clockwise moments, there
will be a resultant moment, so the object will turn.
Unstable objects tip over easily.
The position of the centre of mass is very important.…

Page 3

Preview of page 3
EXAM:
Wednesday 20th
May [PHYSICS UNIT 3 REVISION NOTES]




Circular Motion
A body remains stationary, or keeps moving at the same speed in a straight line,
unless an unbalanced force acts upon it.
If a body moves in a circular path there must constantly be an unbalanced force
acting upon…

Page 4

Preview of page 4
EXAM:
Wednesday 20th
May [PHYSICS UNIT 3 REVISION NOTES]




The centripetal force on a vehicle moving round a roundabout is due to friction
between the tyres and the road.
The centripetal force on an aircraft circling round is due to the combined effect of its
weight and the lift force…

Page 5

Preview of page 5
EXAM:
Wednesday 20th
May [PHYSICS UNIT 3 REVISION NOTES]




· This means Hydraulic systems are used to make difficult jobs easier to do!




5 | Page



Page 6

Preview of page 6
EXAM:
Wednesday 20th
May [PHYSICS UNIT 3 REVISION NOTES]




The Eye
Light enters the eye through a thin transparent layer called the cornea. This protects
the eye and focuses the light onto the retina. This is a layer of light sensitive cells
located at the back of the inside of…

Page 7

Preview of page 7
EXAM:
Wednesday 20th
May [PHYSICS UNIT 3 REVISION NOTES]




The normal human range of vision is 25cm to infinity. The eye has a near point of
25cm and a far point at infinity.
1
P ower (Dioptres) = Focal Length (m)




7 | Page



Page 8

Preview of page 8
EXAM:
Wednesday 20th
May [PHYSICS UNIT 3 REVISION NOTES]




Eye Problems
· A person with short sight can see close images clearly, but distant objects are blurred
because the uncorrected image is formed in front of the retina. Short sight is caused
by the eyeball being too long or the…

Page 9

Preview of page 9
EXAM:
Wednesday 20th
May [PHYSICS UNIT 3 REVISION NOTES]




Lenses and Refraction
Lenses are usually made from glass or
plastic.
All lenses change the direction of light
rays by REFRACTION.
Light is refracted when it enters and
leaves glass prisms.




Different lenses produce different kinds of image.
There are two…

Page 10

Preview of page 10
EXAM:
Wednesday 20th
May [PHYSICS UNIT 3 REVISION NOTES]




The distance from the lens affects the image...




For diverging lenses...
An incident ray parallel to the axisrefracts through the lens and travels in line with
the focal point .
An incident ray passing towards the focal point refracts through the…

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »