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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

What are the four forces in nature
 Strong and weak nuclear forces
 Electromagnetic
 Gravity

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

Give the equationa for centripetal acceleration and centripetal force

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

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

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.

