# Physics 2 Force.txt

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• Define mass. Define inertia
• Mass: the quantitative measure or an objects inertia
• Inertia: the tendency of an object to remain in its present state of motion
1. What are the four forces in nature
• Strong and weak nuclear forces
• Electromagnetic
• Gravity
2. Define Newtons laws
• 1: law of inertia. Objects request changes in motion
• 2: F=ma which means change in motion/acc is inversely proportional to the size of the object and the force required to change the motion is directly proportional to the size of the object
• 3. Equal and opposite reaction, the opposite reaction never occurs in the reaction system
3. Give the equationa for centripetal acceleration and centripetal force
• Ac= (V^2)/r
• Fc=mAc
4. What is the equation for force exerted by friction. What are the friction types
• Ff=(friction coefficient)(normal force)
• Static and kinetic, static is stronger
5. Define Hooke's law
• F=-k(delta(x))
• The force exerted by a material is proportional to a constant times the amount of displacement experienced by the material by an external force
6. How to calculate center of mass and center of gravity
• Center of mass: Multiply each mass by the distance from any one point on the object and sum them together. Divide this sum by the tot mass.
• Center of gravity: use same equation, but substitute weight for mass.

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 Author: p.reilly1227 ID: 233867 Filename: Physics 2 Force.txt Updated: 2013-09-09 22:27:34 Tags: Physics Force Folders: Description: Physics 2 Force.txt Show Answers:

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