Slides in this set

Slide 1

Preview of page 1

STARS…read more

Slide 2

Preview of page 2

FORCES & WAVES…read more

Slide 3

Preview of page 3

Turning Forces
A Moment is the Turning Effect of a Force
moment (Nm) = force (N) x perpendicular
distance (m) between line of action and pivot
· the force causes a turning effect or moment, a larger force would cause a larger moment
· making the distance longer, the same force can make a larger moment because the distance
from the pivot is greater…read more

Slide 4

Preview of page 4

Centre of Mass
freely suspended pivot
from this point Centre of Mass Hangs Directly Below Point of Suspension
· the centre of mass of an object is the point at which the
whole mass seems to be concentrated
centre of · a freely suspended object will swing until its centre of mass is
mass vertically below the point of suspension
· the objects weight acts at a distance from the pivot which
creates a moment about the pivot, making it swing until the
centre of mass is at its lowest (directly under the pivot)
· it rests in this position as there's no moment, the pivot is in
line with the line of action of the force
Finding the centre of mass of a flat shape:
1) hang the shape and a plum line from the same point
2) draw along the line on the shape
3) do the same thing again but hang the shape from a centre of
different pivot point mass
4) the centre of mass is where the two lines meet…read more

Slide 5

Preview of page 5

Balanced Moments & Stability
For The Seesaw two balance:
total anticlockwise moments = total clockwise moments
Are The Moments Equal?
· if the anticlockwise moments are equal to the clockwise moments, the object won't turn
If They're Not Equal
· if the anticlockwise moments do not equal
the clockwise moments, there will be a
resultant moment so the object will turn
· an object will begin to tip over if its centre of
the mass moves beyond the edge of its base
· if the weight doesn't act in line with the
pivot it'll cause a resultant force, this will:
· put the object up right if the line of
gravity is inside the base
· tip it over if the line of gravity is
outside the base
· the most stable objects have a wide base
and a low centre of mass…read more

Slide 6

Preview of page 6

a car making a turn: the force
Centripetal Force of friction on the car's wheels
provide the centripetal force
· in a circular motion the velocity is always changing because
the direction of motion is changing so it has acceleration
even though the speed can be constant · a bucket of water spun in a
· in the circular path there is a force acting toward the centre circle: the tension acting on the
preventing the object from continuing outward and flying off, string provides the centripetal
so the acceleration if towards the centre of the circle force
· the force acting towards the centre of the circle is the
centripetal force
· the centripetal force required will increase when:
· the mass is increased
· the radius is decreased
· the velocity is increased
· the moon orbiting the Earth:
gravity acting on the moon
provides the centripetal force…read more

Slide 7

Preview of page 7
Preview of page 7

Slide 8

Preview of page 8
Preview of page 8

Slide 9

Preview of page 9
Preview of page 9

Slide 10

Preview of page 10
Preview of page 10


Becky Wright


wow, excellent presentation, so informative!



this was great

Similar Science resources:

See all Science resources »