Forces
Textbook - Chapter 4
Watch both before reading notes for an general understanding of Forces and the concepts of:
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Newtons First Law:
An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Often called the 'Law of inertia' The person riding the skateboard to the right wants to continue movng, even though the skateboard has stopped. So, they keep moving to the right until they fall off. |
Newtons Second Law:
Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). This gives us the direct relationship: F = ma Using newtons second law, you can determine the amount of force the man is exerting on the car: F = ma F = 1,000*0.05 F = 50N |