29 terms

Inertia

The property of things to resist changes in motion

Newton's First Law of Motion

Every object continues in a state of rest or of uniform speed in a straight line unless acted upon by an a non-zero net force

Force

In the simplest sense, a push or a pull

Net Force

The vector sum of forces that act on an object

Mechanical equilibrium

The state of an object or system of objects for which there are no changes in motion (b/c there are no net forces)

Equilibrium Rule

For any object or system of objects in equilibrium, the sum of the forces acting equals zero. ( ΣF = 0 )

Applied Force

The force exerted "onto" an object

Friction (Force)

A force, which acts in the opposite direction of the applied force, that acts to resist the relative motion of objects in contact.

Support Force

An upward force that balances the weight of an object on a surface

Weight

The downward force that an object exerts on the Earth, by nature of gravity's pull on its mass

Balanced Forces

All forces, when added, equal zero. Another way to say No Net Force

Tension Forces

The "stretching force" that acts upward on an object, and is usually seen in ropes, chains, etc.

Vector Quantity

Any quantity that is described by magnitude and direction. (i.e. Force, velocity...)

Scalar Quantity

Any quantity that is described by magnitude only. (i.e. time, mass...)

Headwind

A wind/air resistance that works as friction against the motion of an object. It serves to reduce the force, velocity, etc of the object

Tailwind

A "wind" that works as as an additional applied force that works to adds to the motion of an object. It serves to increase the force, velocity, etc of the object

Static Equilibrium

A state of motion that describes a situation where an object is at rest and all of its forces are balanced

Dynamic Equilibrium

A state of motion that describes a situation where an object is moving and all of its forces are balanced

Resultant

The sum of two or more vectors

Components

the vectors that when added together yield a resultant

weight

A measure of the force of gravity on an object's mass

newtons

A metric unit for measuring force.

Resultant equation

component + component = resultant

Pythagorean Theorem

a ² + b ² = c ²

Fnet = 0, ΣF = 0

In equilibrium

no net force ≠ no forces

Balanced forces on both sides; constant speed

Aristotle, Copernicus, Galileo, and Newton

significant figures in history of MOTION

no net force -> constant velocity -> no change in motion

when an object travels the same distance every second both directions

The Moving Earth

Copernicus proposed that Earth was moving, circulating the Sun.

This idea was refuted by people

This idea was refuted by people