# Forces

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 Author: JustDoughnut ID: 242449 Filename: Forces Updated: 2013-10-23 19:20:14 Tags: Physics Folders: Description: newton's laws of motion Show Answers:

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1. kinematics
how objects move
2. dynamics
why objects move
3. Force
A push or a pull on an object
4. Gravitational Force
• attractive force that exists between all objects
• weakestÂ
• ex. force of earth holds moon in orbit
5. Electromagnetic Force (EM force)
• charged particles at rest/in motion they exert electrical/magnetic forces
• give materials their ability to bend, strength, etc.
• holds everything together
6. Nuclear Force
• holds the particles in the nucleus together
• strongest
7. weak force
a form of electromagnetic force involved in the radioactive decay of some nuclei
8. Newton's First Law (Law of Inertia)
An object will maintain its constant velocity until a force acts upon it.

An object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force.
9. Inertia
only dependent on mass; the tendency of an object to maintain it's motion
10. Example Of Law of Inertia
You drive your car without seat belts. At 40 mph you hit another car that ran a stop sign. The car slows down but you do not.
11. Newton's Second Law (Force and Acceleration)
The acceleration of an object is directly proportional to the force on the object and indirectly proportional to the mass of the object

• F=ma
• As F increases, a will increase if mass stays the same.

As m increases, a will decrease if force stays the same.
12. Newton (N)
13. Newton's Third Law (action - reaction)
• when one object exerts a force on a second object, the second object exerts a force on the first object that's equal in magnitude but opposite in direction.
• For every action, there is an equal (in magnitude) and opposite (in direction) reaction.
14. Third Law example
pushing on a wall. The action force in someone pushing on the wall. The reaction force is the wall pushing back on the person.

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