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# Phys Sem.1 - Boren

### A review of concepts, equations, units, and variables for Semester 1 of Physics.

How fast something gets faster or how fast it slows down or how fast something changes direction. Also the change in velocity divided by time. Δv / Δt acceleration
How fast something is moving without regard to its direction. Also the distance traveled divided by time. d / t speed
Speed and direction. Also the displacement divided by time. Δx / Δt velocity
A push or a pull. force
A measure of how difficult it is to speed something up or get it to stop. inertia (or Newton's 1st Law)
The units for velocity. meters per second, m/s
The units for time. seconds, s
The units for mass. kilograms, kg
The units for force. Newtons, N
The units for acceleration. meters per second squared, m/s²
For every action force there is an equal but opposite reaction force. Newton's 3rd Law
The acceleration of an object is equal to the net force acting on it divided by its mass. a = Fnet / m Newton's 2nd Law
An objects change in position. displacement
The gravitational acceleration near the surface of the Earth. g = 9.8 m/s²
The variable for velocity. v
The variable for acceleration. a
The variable for force. F
The variable for time. t
The force that keep an object moving along a circular path. Also m·v²/r . centripetal force
The sum of the forces acting on a single object. net force, Fnet
When an object is allowed to fall without any significant forces holding it back. Its motion is determined by the gravitational acceleration. freefall
When forces acting on an object cancel out completely. The net force acting upon it is 0 N. The object may be at rest or moving with a constant velocity, but it will not accelerate. balanced forces
When forces acting on an object do not cancel out completely. The net force acting upon it is NOT zero. The object will accelerate. unbalanced forces
The velocity when an object is at rest, stationary, or stopped. This is also the initial velocity of an object that is dropped. v = 0 m/s
What you can determine from a position versus time graph of an object's motion (aka x vs. t graph). slope = velocity
What you can determine from a velocity versus time graph of an object's motion (aka v vs. t graph). slope = acceleration
Created by: john.boren