Transcript Examples of Newton`s 1 st Law

An object at rest tends to stay at rest
and an object in motion tends to
stay in motion with the same
speed and in the same direction
unless acted upon by an
unbalanced force.
• In other words, an object will keep
doing whatever it’s doing (sitting still
or moving) unless an unbalanced
force acts on it.
• Example: Your skateboard will stay
lying in the driveway until someone
moves it. And, if your skateboard
suddenly hits a curb and stops short,
you will keep moving until something
stops you!
• Newton’s 1st Law of Motion is also known as the
Law of Inertia.
• Inertia is an object’s tendency to resist a change
in motion.
• The greater an object’s mass, the greater its
inertia, and the larger the force needed to
overcome the inertia.
•Which vehicle would take
longer to stop?
Examples of Newton’s 1st Law:
The Law of Inertia
Think about what you have learned
about Newton’s 1st Law, the Law of
Inertia.
With a partner, think of an example to
share.
Newton’s 1st Law and You
Because of inertia, objects (including you) resist
changes in motion.
When the car going 80 km/hour is stopped by the
brick wall, your body keeps moving at 80 km/hour.
Newton’s 2nd Law
Force= mass x acceleration
The greater the force
applied to an object,
the more the object
will accelerate.
It takes more force to
accelerate an object
with a lot of mass
than to accelerate
something with very
little mass.
– The greater the force, the greater the
acceleration.
– The greater the mass, the greater the
force needed for the same acceleration
– Calculated by: F = ma
– (F = force, m = mass, a = acceleration)
Examples of Newton’s 2nd Law
Think about what you have learned about
Newton’s 2nd Law.
With a partner, think of an example to share.
Newton’s 3rd Law
• For every action force, there is an equal and
opposite reaction force. (Forces are always
found in pairs.)
• Athlete pushes bar upwards.
• Bar pushes the athlete downwards.
• Bowling ball pushes pin to the right.
• Pin pushes bowling ball to the left.
Newton’s
rd
3
Law
Newton’s 3rd Law
Inside rocket, fuels are burned
in the engine, producing hot
gases.
The hot gases push against the
inside tube of the rocket and
escape out the bottom of the
tube. As the gases move
downward, the rocket moves in
the opposite direction.
Examples 3rd Law
Think about what you have learned about Newton’s
3rd Law.
With a partner, think of an example to share.