Embedded Files
Newton’s First Law (The Law of Inertia) - An object at rest remains at rest, and an object in motion continues in motion with constant velocity unless the object experiences a net external force.
Newton’s Second Law (F=ma)
The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the object’s mass.
∑F=ma a=(∑F)/m
Net external force = mass • acceleration
Newton’s Third Law (Forces come in pairs)
If two objects interact , the magnitude of the force exerted on object 1 by object 2 is equal to the magnitude of the force simultaneously exerted on object 2 by object 1, and these two forces are opposite in direction.
In this photo we see an example of Newton's Third Law with the recoil of this cannon.
(click on the picture for a larger view)
Videos
When water leaves a spinning bicycle tire, we can see it travel in a straight line (with constant velocity), demonstrating Newton's First Law.
Static Equilibrium is explained in this video and a sample problem is worked through.
A ship coming into port has a lot of inertia and cannot stop before crashing into the dock.
Newton's Second Law and Inertial Mass demonstrations aboard the International Space Station.
Force and Pressure - The bed of nails experiment similar to the one seen in the text book on p.65.
Newton's Third Law is seen in action with the recoil of a powerful rifle.
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