40 terms

Equilibrium

In general, a state of balance where Fnet = 0

Force

Any influence that tends to accelerate an object. A push or a pull; measured in Newtons.

Friction

The force that acts to resist the relative motion (or attempted motion) of objects or materials that are in contact. A force that works against the motion of an object

Kilogram

The fundamental SI unit of Mass.

Mass

A measure of an object's inertia. Also, a measure of the amount of matter in an object. Depends only on the amount of and kind of particles that compose an object - not on its location.

Newton

SI Unit of Force.

Normal Force

For an object at rest, it is the upward force that balances the weight of the object at rest. Also called a Support Force

Volume

The quantity of space an object occupies

Newton's Second Law

The acceleration of an object is directly proportional to the net force acting on the object, it in the direction of the net force and is inversely proportional to the mass of the object. In other words... F=ma

Free Fall

Motion under the influence of gravitational pull only

Terminal Speed/Velocity

The speed at which the acceleration of a falling object terminates because air resistance balances its weight.

Acceleration

Change in velocity divided by the time it takes for the change to occur

Inverse Proportion

a relation between two quantities such that one increases in proportion as the other decreases.

Direct Proportion

A relationship between two quantities in which one increases as the other increases

Air Resistance

frictional force air exerts on a moving object; acts opposite in direction to the object's motion.

Depends on two things: speed and frontal surface area

Depends on two things: speed and frontal surface area

Net Force

The sum of all forces acting on an object. It is the net force that accelerates a mass (in the direction of the net force).

SCALAR QUANTITIY

A quantity in physics, such as mass, volume, and time that can be completely specified by its magnitude and has no direction

VECTOR

An arrow whose length represents the magnitude of a quantity and whose direction represents the directions of the quantity

NEWTON'S THIRD LAW

Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.

ACTION FORCES

the forces described in Newton's Third Law, that are equal and opposite to the Reaction Forces.

REACTION FORCES

the forces described in Newton's Third Law, that are equal and opposite to the Action Forces.

FORCE PAIR

The combined Action-Reaction forces that interact with each other, as described in Newton's Third Law

INTERACTION

Mutual action between objects where each object exerts an equal and opposite force on the other.

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

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

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...)

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