Newton’s 3rd Law Chapter 6.

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Presentation transcript:

Newton’s 3rd Law Chapter 6

Forces Forces occur when two objects interact. This consists of a push or pull on the object.

Forces Forces act in pairs. We call these pairs action-reaction pairs. Action-reaction pairs are equal in magnitude but opposite in direction.

Forces When a force occurs, there are two objects being considered. There are also two forces being considered. One force acts on each object.

Newton’s 3rd Law Newton’s 3rd Law states: Whenever one object exerts a force on a second object, the 2nd object exerts an equal and opposite force on the first object.

Newton’s 3rd Law Simply put – For every action, there is an equal and opposite reaction.

Newton’s 3rd Law The first force is the action force. The second force is the reaction force. Action: A acts on B Reaction: B acts on A

Newton’s 3rd Law [F=ma]1 = [F=ma]2 Think about a cannon and a cannonball.

Examples What will be the acceleration of recoil when a 60 kg person on rollerblades pushes against a wall with a force of 30N ?

Answer F=ma Therefore a = F/m 30N/60kg = 0.5 m/s2 away from the wall

Examples What is the net force on a falling 1000N barrel hitting a pavement with 5000N of force?

Answer Fnet = result of all forces combined. Fnet = 5000 N – 1000 N = 4000 N upward.