PH114 Exam 2

Physics test

Newton’s 1st law

Inertia- An object in motion stays in motion unless acted upon by an outside force

Newton’s 2nd law

Force is a product of mass and acceleration

Newton’s 3rd law

Every action has an equal and opposite reaction

Motion

Object changing position over time when compared with a reference point

Reference point

a point of reference like the earth’s surface

Speed

rate at which object moves (depends on distance traveled and time taken)

Avg speed

total distance/total time (m/s)

Velocity

speed of an object in a particular direction

when is velocity constant?

both speed and direction don’t change

Acceleration

rate @ which velocity changes

Acceleration formula

(vf-vi)/time of change

Kinematics

study of motion

Free Body Diagram

shows every force acting on a free body

Balanced forces equal what

Zero

Unbalanced forces equal what?

anything greater than or less than zero

The formula we gave from the second law

F=M*A