Blog posts with the tag Ask me anything | Interested In Everything

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Blog posts with the tag "Ask me anything"

These are just a few basic rules that form a basis for our understanding of physics.

 

 

To  recap, the first law states that:

  • An object at rest tends to stay at rest, and will remain at rest unless acted upon by an external force.
  • An object in motion tends to stay in motion, with same direction and speed.
  • Motion, or lack thereof, cannot change unless a force acts to change the motion.

Any change in motion involves an acceleration, which brings us to Newton’s second law:

 

 

F=ma where ‘F’ is the net external force on an object, m is the mass of an object and ‘A’ is the acceleration.

This law allows us to compare results of the same force exerted on objects of a different mass.

If you exert the same force on two objects of a different mass, you will get different accelerations, or changes in motion. For example, the effect of a 10 newton force on a golf ball would be much greater than that same force acting on a truck. This is due to the differences in their masses.

 

Newton’s third law states that for every action (force) there is an equal and opposite reaction.

 

 

As you can see from the example in our video, forces are found in pairs. There are no isolated forces. A system cannot pick itself up into motion with purely internal forces, to achieve a net force an acceleration it must interact with an external force.

 

Any questions? Still not clear?  Feel free to ask me anything or share your comments below. I look forward to hearing from you.