DYNAMICS: NEWTON'S LAW
OF MOTION
Force
Newton’s First Law of Motion
Mass
Newton’s Second Law of Motion
Newton’s Third Law of Motion
Weight—the Force of Gravity;
and the Normal Force
A force is a push or pull.
Mass is the measure of inertia of an object
Force is a vector, having both
magnitude and direction
An object at rest need a force to get it moving
a moving object needs a
force to change its velocity
The magnitude of a force can be measured using a spring scale
Newton’s first law is often
called the law of inertia
Inertia
Every object continues in its state of rest or of uniform velocity as long as no net force on it
In the SI system, mass is
measured in kilograms
Mass is not weight.
Mass is a property of an object. Weight is the
force exerted on that object by gravity.
is the relation between
acceleration and force.
Acceleration is proportional to force and inversely proportional to mass.
click to edit
Force is a vector, so ΣF=ma is true along each
coordinate axis.
ΣF=ma
Weight is the force exerted on an object by gravity. Close to the surface of the Earth, where the gravitational force is nearly constant
F=mg
g=9.81
The force exerted perpendicular to a surface is called the normal force. It is exactly as large as needed to balance the force from the object.
Any time a force is exerted on an object, that
force is caused by another object.
A key to the correct application of the third law is that the forces are exerted on different objects.
Rocket propulsion can also be explained using Newton’s third law: hot gases from combustion spew out of the tail of the rocket at high speeds.
Helpful notation: the first subscript is the object that the force is being exerted on; the second is the source.
MUHAMMAD IZZUL IRFAN BIN SURJANI
AMEERUL HAFIZ BIN MD ROZMAN