physics unit 3 aqa turning effect and circles

physics unit 3 aqa turning effect and circles

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  • Created on: 29-05-12 10:33
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How do forces have a turning effect?
Turning effect of force = the moment
Moment (Nm) = Force (N) x Perpendicular distance from the line of action of the force to the
axis of rotation (m)
Centre of mass of body = when thought mass of body is concentrated
If suspended, body will rest with its centre of mass directly below suspension.
Centre of mass of symmetrical body = along axis of symmetry
If body is not turning > total clockwise movement = balanced to total anticlockwise
movement about any axis
If line of action of the weight of a body lies outside the base of the body there will be a
resultant force and tend to topple over
What keeps bodies moving in a circle?
When something moves in a circle is continuously accelerates towards the centre of the
circle. This changes the direction not the speed.
Resultant force causing acceleration = centripetal force
Direction of centripetal force is always to centre of circle
Centripetal force causing circular motion needs to increase if;
The mass of the body increases
The speed of the body increases
The radius of the circle decreases

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