Newton’s 2 nd and 3 rd Law of Motion. Newton’s 2 nd Law of Motion A net force acting on an object causes the object to accelerate in the direction of.

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Presentation transcript:

Newton’s 2 nd and 3 rd Law of Motion

Newton’s 2 nd Law of Motion A net force acting on an object causes the object to accelerate in the direction of the force A net force acting on an object causes the object to accelerate in the direction of the force

“A net force acting on an object…” Smaller the mass the greater it will accelerate Smaller the mass the greater it will accelerate If you apply the same force to a marble and to a bowling ball the marble will go faster If you apply the same force to a marble and to a bowling ball the marble will go faster

“….accelerate in the direction of the force” Greater the force applied, the greater the acceleration Greater the force applied, the greater the acceleration 2 objects that are the same masses, the one with more force applied to it will go faster 2 objects that are the same masses, the one with more force applied to it will go faster

2 nd Law Formula Force = mass X acceleration Force = mass X acceleration F = m X a F = m X a

Newton’s 3 rd Law of Motion For every action there is an equal but opposite reaction. For every action there is an equal but opposite reaction. All forces act in pairs with one object exerting a force on a second object, and the second object exerting a force back All forces act in pairs with one object exerting a force on a second object, and the second object exerting a force back

Action-Reaction Pairs Person on trampoline Person on trampoline Jumping off a boat Jumping off a boat Swimmer moving through water Swimmer moving through water

Forces may not be balanced. Forces may not be balanced. This causes things to move, like a person throwing a basketball from a wheelchair. This causes things to move, like a person throwing a basketball from a wheelchair.

Momentum Momentum is a property of a moving object because of its mass and velocity. Momentum is a property of a moving object because of its mass and velocity. If an object is not moving it has zero momentum If an object is not moving it has zero momentum

Momentum only changes if velocity, mass or both change Momentum only changes if velocity, mass or both change Momentum can be transferred Momentum can be transferred

Law of Conservation of Momentum Total momentum never changes unless a force acts on the object (like gravity) Total momentum never changes unless a force acts on the object (like gravity)