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Natural motion

Anything that moves with or against gravity

Unnatural motion

Anything that moves other than with or against the force of gravity

inertia

_______ is the property of an object that leads it to resist any change in motion

Galileo Galilei

A man from Italy who first proposed the law of inertia as well as making observations on the Moon, sun, Venus, and jupiter

Speed

Units: cm/s, m/s, mi/hr, km/s ...

Average Speed

Distance traveled divided by the time required to cover the distance

Instantaneous Speed

Magnitude of instantaneous velocity

Velocity

a speed in a particular direction.

Vector quantity

9.8m/s per second is a

force

(interactions between two objects)

displacement

A change in position (delta p).

Reference Point

A _______ is a place or object used for comparison to determine if something is in motion.

Scalar Quantity

a measure of magnitude

The Pythagorean Theorem

a^2 + b^2 = c^2

0.2248 lbs

1 N = how many lbs?

4.4 N

1 lb = how many Newtons?

Isaac Newton

A man from England who realized that the planets move around the Sun because of inertia as well as developing the laws of motion and gravity

Free body diagram

A diagram that shows all forces acting on an object, with proper relative magnitudes and directions for objects

∑F = 0

The Equilibrium Rule:

Support force

The force that acts against the surface that an object rests on (does NOT always counteract weight)

Dynamic equilibrium

A state of motion where an object is moving with constant velocity

Static equilibrium

A state of motion where an object is at rest

Coriolis Effect

An effect whereby a mass moving in a rotating system experiences a force acting perpendicular to the direction of motion and to the axis of rotation

Foucault Pendulum

A pendulum whose swing plane changes accordingly throughout the day to the direction of the earth's rotation

Newton's First Law of Motion

An object in motion will stay in motion forever unless it is acted on by an unbalanced force and an object at rest will stay at rest unless an unbalanced force acts upon it as well.

Mechanical Equilibrium

The state of an object or system of objects for which there are no changes in motion. In accord with Newton's first law, if at rest, the state of rest persists. If moving, motion continues without change.

Equilibrium Rule

For any object or system of objects in equilibrium, the sum of the forces acting equals zero. In equation form, EF=0.