Newton’s Law Of Motion

force is

push or pull

everyday we apply ____ to do work

force

Equal forces applied to an object from opposite directions are called ______.

balanced forces

force can be expressed in _____

newton

the unit of force was named after a physician and mathematician named

isaac newton

Force may have different effects on objects. It can be explained by the following laws:

1. Law Of Inertia (first law)

2. Law of Acceleration (second law)

3. Law Of Interaction (third law)

"an object at rest remains at rest, and an object in motion will continue to move at constant velocity unless acted upon by a net force"

law of inertia (first law)

The tendency of an object to maintain its state of rest or uniform velocity in a straight line.

inertia

is a measure of the inertia of an object.

Mass

the greater the mass,

the harder to move or stop

in law of inertia, the forces are always ______

balanced

what is the rule of law of inertia

objects at rest, stays at rest. Objects at motion stays in motion

The motion of an object may change depending on the amount of force applied to it. This law is known as the

law of force and acceleration.

rule of law of acceleration

"If there is a net force acting on a body, there is acceleration."

in the second law, the presence of an unbalanced force will accelerate an object - ____, ____ or both.

speed, direction

two variables of the second law

1. Net force acting upon the object

2. mass of an object

based on the second law, As the force acting upon an object is increased, the acceleration of the object is _____

increased

based on the second law, As the mass of an object is increased, the acceleration of the object is ______.

decreased

in the second law of motion, An object will accelerate if there is a _______ force acting upon it.

net or unbalanced

Force and acceleration are _____ proportional to each other.

directly

Mass and acceleration are ______ proportional to each other.

inversely

formula for the second law of motion

f=ma

what is the unit of force

kg.m/s² or N

In every action, there is always an equal and opposite reaction

law of interaction (3rd law)

are forces that come in a pair during an interaction between two objects

Action and reaction forces

Action – Reaction pair can be considered if

• Acting on two different bodies.

• Acting simultaneously on the system of two bodies.

• In opposite directions.

• Have the same magnitude.

Identify Newton’s Laws of Motion being applied: You feel hurt when you strike the wall

3rd law

Identify Newton’s Laws of Motion being applied: A nail hit by a hammer

3rd law

Identify Newton’s Laws of Motion being applied: Pushing a cabinet

2nd law

Identify Newton’s Laws of Motion being applied: Riding a bicycle

1st law

Identify Newton’s Laws of Motion being applied: Wearing a seatbelt

1st law

Identify Newton’s Laws of Motion being applied: tug of war

2nd law but can be all laws

how can you say an object is in motion?

• position

• direction

• applying force