Physics laws of Motion

Motion

is the change in position of an object with respect to time. It involves concepts such as speed, velocity, and acceleration, and is governed by Newton's laws.

Forces

• Is a simple push and pull. It is also a vector quantity because it has direction.

• Has a unit of Newton(N)

Force

1 N = 1 kg.m/s²

Contact Forces

• there should be a direct contact so see the effect of the applied forces

• nag touch/ in contact ang two object.

Field Forces

• the effect of the force is felt even in the absence of contact (long range)

Gravity Forces, Fg

• force due to gravity

The force of gravity is the force with which the earth, moon, or other massively large object attracts another object towards itself.

By definition, this is the weight of the object. All objects upon earth experience a force of gravity that is directed "downward" towards the center of the earth.

The force of gravity on earth is always equal to the weight of the object as found by the equation: Fg = mg

Normal Forces, FN

• is the support force exerted upon an object that is in contact with another stable object.

• is exerted horizontally between two objects that are in contact with each other.

Friction Force, Ff

• is the force exerted by a surface as an object moves across it or makes an effort to move across it.

• opposite of the motion of the object

types of friction force

Static and kinetic force

static force

• friction that must be exceeded in order to start a motion.

• gapundo/steady ang object

• Fs = μs. Fn

kinetic force, Fk

• friction existing between two moving bodies.

• only applied if the object is already moving

• Fk = μk. Fn

Equation of Friction Force

Ff = μ.Fn (μ is the coefficient of friction, static and kinetic have different μ)

Tension Force, FT

• is the force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends.

• is directed along the length of the wire and pulls equally on the objects on the opposite ends of the wire

Unbalanced force

A resultant force that is not equal to zero

Law of Inertia

state that a body at rest will remain at rest and a body in motion will continue to move with constant velocity unless acted upon by an unbalanced force

Inertia

is the property of a body that tends to resist change in its state of motion.

The relationship of mass and inertia

Mass is a measure of Inertia. The greater the mass, the greater the Inertia. The greater inertia, the harder it is to change the state of motion of a body.

Law of Acceleration

• The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

• F = ma

Law of Action-Reaction

• states that for every action, there is an equal but opposite reaction.

• states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction

Free body Diagram

Illustrations of all forces acting and or applied to a body.