1.)
Law
of Inertia
A body a rest
will remain at rest or 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 a change in
its state of rest or motion.
Examples :
2.)
Law of
Acceleration
An unbalanced
force acting on a body produces acceleration.
The acceleration is directly
proportional to the unbalanced force and inversely proportional to the mass of
the body. It acts in the same direction
as the unbalanced force.
In symbols , F = ma (where F is force , m is mass , a is acceleration)
The SI unit of Force is the
Newton (N).
The newton is equivalent to
kgm/s2 (kilogram meter per second squared).
Example:
A 5.0 kg body at rest was acted
upon by a force resulting to its motion to the right at 4m/s2.
Calculate the Force.
F = ma F=(5.0 kg)(4 m/s2)
= 20 kgm/s2 or 20 N
3.)
Law
of Interaction
For
every action, there is an equal but opposite reaction. When Body A exerts a force on Body B,
Body B will exert an equal but oppositely directed force on Body A.
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