21 terms

Force

A push or a pull.

Gravitational Force

An attractive force between all objects

Electromagnetic Force

Forces between particles as a result of electric and magnetic attraction

Strong Nuclear Force

Holds particles in atomic nucleus together

Vector

Represented by an arrow

Arrow length: Magnitude

Arrow Head: Direction

The vectors to the right are considered positive, and to the left are considered negaitve

Velocity, acceleration, and force can all be represented by this arrow

Arrow length: Magnitude

Arrow Head: Direction

The vectors to the right are considered positive, and to the left are considered negaitve

Velocity, acceleration, and force can all be represented by this arrow

Newton's First Law

An object with no net force acting on it remains at rest or moves with constant velocity in a straight line (once set in motion)

If there is a net force, an unbalanced force exists

If there is not net force, there is not unbalanced force

If there is a net force, an unbalanced force exists

If there is not net force, there is not unbalanced force

Inertia

An object in motion remains in motion and an object at rest remains at rest unless there is an outside force acting on it.

The greater the mass, the greater the inertia

The greater the mass, the greater the inertia

Newton's Second Law

The acceleration of a body is directly proportional to the net force on it, and inversely proportional to its mass.

Fnet=ma

a=Fnet/m

No acceleration=no net force

Fnet=ma

a=Fnet/m

No acceleration=no net force

Acceleration

The same direction as the force acting on it

Newton's Third Law

When one object exerts a force on a second object, the second object exerts a force on the first that is equal in magnitude but opposite in direction.

The two forces are action-reaction pairs

The two forces are action-reaction pairs

Mass

Amount of matter that an object contains

Scalar (g or kg)

Gravitational: m=w/g

Inertial: m=Fnet/a

Mass never changes depending on location

Scalar (g or kg)

Gravitational: m=w/g

Inertial: m=Fnet/a

Mass never changes depending on location

Weight

Mass x Gravitational Acceleration

vector (N)

w=mg

g=9.8 m/s^2

Weight can change depending on location

vector (N)

w=mg

g=9.8 m/s^2

Weight can change depending on location

Vector Quantity

requires magnitude and direction

force, velocity, acceleration, displacement, position, weight

force, velocity, acceleration, displacement, position, weight

Scalar Quantity

magnitude only

mass, volume, speed, distance

mass, volume, speed, distance

Parallel Vector Addition

same direction=zero degrees (maximum result)

opposite direction=180 degrees (minimum result)

Fnet = F1x + F2x + F3x ...

Fnet = F1y + F2y + F3y ...

opposite direction=180 degrees (minimum result)

Fnet = F1x + F2x + F3x ...

Fnet = F1y + F2y + F3y ...

Perpendicular Vector Addition

Parallelogram Method

Arrow Tail to Arrow Head Method

Arrow Tail to Arrow Head Method

Free Body Diagram

A diagram that shows the forces acting on the object

Analytical Method of Vector Addition

0 degrees = same direction ; maximum result

180 degrees = opposite direction ; minimum result

90 degrees = perpendicular directions

parallelogram

arrow head to tail

analytically

R^2 = Rx^2 + Ry^2

theta = arctan (Ry/Rx)

CALCULATOR MUST BE IN DEGREE MODE!

180 degrees = opposite direction ; minimum result

90 degrees = perpendicular directions

parallelogram

arrow head to tail

analytically

R^2 = Rx^2 + Ry^2

theta = arctan (Ry/Rx)

CALCULATOR MUST BE IN DEGREE MODE!

Equilibrium

When there is no net force and no acceleration

Equilibrant Force

Equal magnitude and opposite direction of net force

Frictional Force

Opposes motion between two surfaces in contact. It is parallel and opposite to the direction of motion

Static=opposes start of motion

Sliding=opposes surfaces that are already moving

STATIC IS GREATER!

Static=opposes start of motion

Sliding=opposes surfaces that are already moving

STATIC IS GREATER!