Force: Newton's Laws of Motion

Question	Answer
Force	That which can cause acceleration
Unit of force	Newton (N)
Newton's 1st law of motion	A body will remain at rest or continue moving at constant velocity unless acted upon by an unbalancing external force
Application of Newton's 1st Law	Seatbelts in cars are used to stop passengers continuing at a constant velocity when the car decelerates rapidly
Newton's 2nd law of motion	The rate of change of momentum is proportional to the applied force and takes place in the direction of the force
Application of Newton's 2nd Law	Heavier objects require more force to move the same distance as lighter objects
Special case of Newton's 2nd Law	F = ma
Newton's 3rd law of motion	For every action there is an equal and opposite reaction
Application of Newton's 3rd Law	When a rocket takes off, the rocket pushes down with the force of its engines, and this causes the ground to push the rocket upwards with an equal force

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