# Forces and their effects 1

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• Forces and their effects
• How are forces represented?
• By an arrow, ideally from where the force originates.
• What will happen if the resultant force acting on a stationary object is zero?
• The object will stay stationary
• What is a resultant force?
• A single force which replaces a number of forces all acting at a particular point.  The resultant force has the same effect on the motion as all the forces acting together.
• What will happen if the resultant force acting on a moving object is zero?
• The object will move at the same speed and in the same direction
• What are the units of mass?
• Kilograms (kg), grams (g) or sometimes tonnes (1000kg)
• What is the unit for force?
• Newtons (N)
• How are force, mass and acceleration linked?
• Force = mass x accelerationF(N) = m (kg) x (m/s2)
• What will happen if the resultant force acting on a stationary object is not zero?
• The object will accelerate in the direction of the resultant force.
• What will happen if the resultant force acting on a moving object is not zero?
• The object will accelerate in the direction of the resultant force.
• What is the unit of acceleration?
• Metres per second squared (m/s2)

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