Force, Motion and Newton's Laws-8

Motion

an object's change in position over time when compared with a reference point (Ref point)

Speed

the rate at which an object moves, speed depends on the distance traveled and the time taken to travel that distance (d/t)

Velocity

the speed of an object in a particular direction (d/t + direction)

Acceleration

the rate at which velocity changes; an object accelerates if its speed changes, direction changes or both change (Delta V)

Acceleration formula

A=(Vf-Vi)/t

Force

a push or pull. All forces have size and direction

Unbalanced force

has motion

Balanced force

no motion

Force SI

Newtons(N)

Gravity

a force of attraction between objects which is due to their masses (Unbalanced)

Weight

a measure of the gravitational force exerted on an object (Newtons)

Mass

the amount of matter in an object (grams)

Law of universal gravitation

all objects in the universe attract each other through gravitational force

Gravitational force variables

Mass and distance

Newton's 1st law

An object at rest will remain at rest and an object in motion remains in motion at a constant speed and in a straight line unless acted upon by and unbalanced force. (Inertia)

Newton's 2nd law

F=ma The acceleration of an object depends on the mass of the object and the amount of force

Newton's 3rd law

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

Momentum

a property of a moving object that depends on the object's mass and velocity

The law of conservation of momentum

anytime two or more objects interact they may exchange momentum but the total amount of momentum stays the same p=mv (p) momentum

Centripetal force

the force toward the center

Centrifugal force

the force toward the outside

Net force

The combination of all forces acting on an object (N's pushed with - N's pulled with)