Newton’s 2nd Law of Motion

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Presentation transcript:

Newton’s 2nd Law of Motion

Newton’s 2nd Law of motion The acceleration of an object is in the same direction as the net force of that object. -In other words, if the net force on an object is in one direction, the acceleration is going to be in that direction.

Newton’s 2nd Law Another way to say it F= ma F= Force m= Mass a= Acceleration

Question You push a wagon that has a mass of 8kg with an acceleration of 0.5 m/s2. What force do you push the wagon with? F=ma M= 8 kg A= 0.5 m/s2 F= 4N

Newton’s Third Law of Motion

What would you do? Imagine a skateboard contest in which each person has to move his or her skateboard without their bodies touching the ground. Neither their feet nor their hands may touch the ground. How would you win this contest? How would you move your skateboard?

Newton’s Third Law For every action force, there is a reaction force equal in strength and opposite in direction.

Explain? All forces come in pairs. For example, the action-reaction pair that is required to move your skateboard includes your foot and the Earth. The reaction force makes you move because it acts on YOU.

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The law of conservation of momentum States: that as long as interaction objects are not influenced by outside forces ( like friction), the total amount of momentum cannot change.