A broom

• Young Digital Planet
• Key Stage 4
• Physics
• I. Forces
• 5. Equilibrium

• Exam Specifications
• Key Stage 4
• AQA GCSE Science A (4461) Physics
• III. Additional materials
• 1. Additional materials
• Additional materials
• AQA GCSE Physics (4451)
• I. Physics 2
• 2. How do we make things speed up or slow down?
• Whenever two bodies interact, the forces they exert on each other are equal and opposite.
• If the resultant force acting on a stationary body is zero the body will remain stationary.
• AQA GCSE Physics (4451)
• V. Physics 2
• 18. How do we make things speed up or slow down?
• Whenever two bodies interact, the forces they exert on each other are equal and opposite.
• If the resultant force acting on a stationary body is zero the body will remain stationary.
• VI. Physics 3
• 27. How do forces have a turning effect?
• to describe how to find the centre of mass of a thin sheet of a material
• to calculate the size of a force, or its distance from an axis of rotation, acting on a body that is balanced
• to analyse the stability of bodies by considering their tendency to topple.
• The turning effect of a force is called the moment.
• The size of the moment is given by the equation: moment (newton metre, Nm) = force (newton, N) x perpendicular distance from the line of action of the force to the axis of rotation (metre, m)
• The centre of mass of a body is that point at which the mass of the body may be thought to be concentrated.
• If suspended, a body will come to rest with its centre of mass directly below the point of suspension.
• The centre of mass of a symmetrical body is along the axis of symmetry.
• If a body is not turning, the total clockwise moment must be exactly balanced by the total anticlockwise moment about any axis.
• Recognise the factors that affect the stability of a body.
• If the line of action of the weight of a body lies outside the base of the body there will be a resultant moment and the body will tend to topple.

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