22-06-2013, 04:34 PM
Newton’s Laws of Motion
Newton’s Laws.ppt (Size: 1.39 MB / Downloads: 58)
While most people know what Newton's laws say, many people do not know what they mean (or simply do not believe what they mean).
Newton’s Laws of Motion
1st Law – An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity, unless acted upon by an unbalanced force.
2nd Law – Force equals mass times acceleration.
3rd Law – For every action there is an equal and opposite reaction.
1st Law of Motion (Law of Inertia)
An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity, unless acted upon by an unbalanced force.
2nd Law
When mass is in kilograms and acceleration is in m/s/s, the unit of force is in newtons (N).
One newton is equal to the force required to accelerate one kilogram of mass at one meter/second/second.
3rd Law
According to Newton, whenever objects A and B interact with each other, they exert forces upon each other. When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body.
There are two forces resulting from this interaction - a force on the chair and a force on your body. These two forces are called action and reaction forces.