Physics: Newtonian Mechanics

v= v_o + at

T

• a
• m/s²

• F
• Newtons

f

• h
• meters

J

• K
• Joules

k

• l
• meter

• m
• Kilograms

• N
• Newtons

• P
• Watts

p

• r
• Meters

• t
• Seconds

U

• v
• m/s

W

• x
• meter

When viewed in an inertial reference frame, an object either is at rest or moves at a constant velocity, unless acted upon by an external force.

The acceleration of a body is directly proportional to, and in the same direction as, the net force acting on the body, and inversely proportional to its mass. Thus, F = ma, where F is the net force acting on the object, m is the mass of the object and a is the acceleration of the object.

When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction to that of the first body.

The path of the planets about the sun is elliptical in shape, with the center of the sun being located at one focus.

An imaginary line drawn from the center of the sun to the center of the planet will sweep out equal areas in equal intervals of time. (The Law of Equal Areas)

The ratio of the squares of the periods of any two planets is equal to the ratio of the cubes of their average distances from the sun. (The Law of Harmonies)

• states that, for relatively small deformations of an object, the displacement or size of the deformation is directly proportional to the deforming force or load. Under these conditions the object returns to its original shape and size upon removal of the load. 
• F=-kx