A scooterist moving with a speed of 36km/h sees a child standing in the middle of the road. He applies the brakes and brings the scooter to rest in 5s just in time to save the child. Calculate the average retarding force on the vehicle, if mass of the vehicle and the driver is 300kg.

Laws of Motion topics include: Forces, gravity and its effects, friction and forces and motion in a plane. Newton's laws of motion are: First law: An object will not change its motion unless a force acts on it. This is also known as the law of inertia. Second law: The force on an object is equal to its mass times its acceleration. Third law: For every action, there is an equal and opposite reaction. This is also known as the law of action and reaction.  Newton's laws of motion can help us understand how things move. For example, the second law explains why it takes less force to move a... Show more

Laws of Motion topics include: Forces, gravity and its effects, friction and forces and motion in a plane.

Newton's laws of motion are:
First law: An object will not change its motion unless a force acts on it. This is also known as the law of inertia.
Second law: The force on an object is equal to its mass times its acceleration.
Third law: For every action, there is an equal and opposite reaction. This is also known as the law of action and reaction. 

Newton's laws of motion can help us understand how things move. For example, the second law explains why it takes less force to move a bike forward than a car. The third law explains why a ball bounces when thrown against a wall. 

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