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Displacement
change of the position. The final position minus the initial position

Avgerage Velocity
The average distance over an average time

Acceleration
Rate of change of the velocity

Free Fall
No forces act on an object other than the gravitational force that makes the object fall

Vector
Have both magnitude and direction.

Force
A push or pull that one object exerts on another

Weight
Magnitude of the gravitational force that a planet or moon exterts on a nearby object

Inertia
Resistance to changes in velocity

Kinetic Friction
When the two objects are slipping or sliding across one another, as when a loose shingl slides down a roof.

Static friction
No slipping or sliding occurs, as between the tires of a car parked on a hill and the road surface

Conservation Law
Physical law that identifies a quantity that does not change wth time

Kinetic energy
Energy due to motion

Potential Energy
Stored energy due to interaction

Translation
Motion of an object in which any point of the object moves with the same velocity as any other point. (object does not rotate or change shape)

Work
Energy transfer that occurs when a force acts on an object that moves

Mechanical Energy
the sum of the kinetic and potential energies

Power
Rate a which work is performed or evergy is converted

Linear Momentum
Product of mass and velocity

Impulse
Product of a vector and a positive scalar

Center of Mass
An average location of the system (a point)

Torque
Role in otation that force itself plays in translation. A measure of how effective a given force is at twisting or turning something

Center of Gravity
Total force of gravity can be considered to act at a single point

Fluids
materials that flow and include both liquids and gases. Nearly incompressible

Pressure
Force per unti area is the same for any orientation of the surface

Density
mass per unit volume

Buoyant force
total force on an object due to fluid

Archimedes Principle
The buoyant force on an object is equal to the weight of an equal volume of fluid

Bernoulli Effect
Fluid flows faster where the pressure is lower

Surface tension
the force per unit lenght with which the surface pulls in its edge

