Newton’s Laws of Physics

Newton’s three laws of motion are integral to understanding robotics.  To remind you the three laws we are talking about are:

  1. An object which isn’t moving won’t start moving unless a force is applied to it.
  2. The force needed to change something’s velocity depends on its mass.
  3. Whenever there is a force acting on something in one direction, another force of the same size is acting on it in opposite direction.

Other important forces to consider while doing robotics:

Friction: is a force that happens when to things rub together, like wheels and the floor.  It opposes motion and makes things slow down.

Momentum: is a measure of how forcefully something is moving in a particular direction. [If something has a lot of mass — like an elephant — it is hard to get it moving, but once it moves, it is even harder to slow it down, or steer.]

Center of Gravity: Because gravity is always pulling us down, staying upright isn’t always easy. Every object that has weight has a center of gravity.  As long as that center of weight is over the base of the object, it will be stable.  The lower the center of gravity to the surface the object rests on the more stable an object is.

Newton’s Laws Video.

Newton’s law of motion – first law – Law of Inertia

Newtons Laws Of Motion – second law – Force, Mass And Acceleration

Newtons Laws Of Motion – third law – Action And Reaction

Newtons Laws Of Motion – Objects of different size and different mass will land at the same time. In an ideal situation, all objects dropped from the same height will land at the same time. Gravity causes the same acceleration for everything. Gravity pulls down on an object. The object’s mass resists the pull. This resistance is called inertia. In an ideal situation the heavier object gets pulled harder, but resists harder as well. Both the heavier and lighter object therefore move the same way.