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Science is fun! Physics is fun! :)
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May 30, 2013
Third Law of Motion
What happens if you pull a rope that is attached to a wall?
Would it be different if it is attached to an elephant?
According to Newton's third law...
For every action there is an equal and opposite reaction.
What does this mean?
This means that for every force there is a reaction force that is equal in size, but opposite in direction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard.
Let's study how a rocket works to understand
Newton's Third Law.
The rocket's action is to push down on the ground with the force of its powerful engines, and the reaction is that the ground pushes the rocket upwards with an equal force.
UP,
UP,
AND
AWAY!
May 28, 2013
Second Law of Motion
What would happen if you kick a wall?
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However, the Second Law gives us an exact relationship between force, mass, and acceleration. It can be expressed as a mathematical equation:
This is an example of how Newton's Second Law works:
What about a soccer ball?
This is related to the Newton's second law...
Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). |
What does this mean?
Everyone is unconsciously familiar with the Second Law. Everyone knows that heavier objects require more force to move the same distance as lighter objects.
However, the Second Law gives us an exact relationship between force, mass, and acceleration. It can be expressed as a mathematical equation:
or
FORCE = MASS times ACCELERATION
or
FORCE = MASS times ACCELERATION
This is an example of how Newton's Second Law works:
Mike's car, which weighs 1,000 kg, is out of gas. Mike is trying to push the car to a gas station, and he makes the car go 0.05 m/s/s. Using Newton's Second Law, you can compute how much force Mike is applying to the car.
Answer = 50 newtons
EXPERIMENT TIME!!!
May 27, 2013
First Law of Motion
Take a look at this "skater" in the picture.
What will happen to him?
As the First Law of Motion states..
What does this mean?
What will happen to him?
What is the motion in this picture?
What is the unbalanced force in this picture?
What happened to the skater in this picture?
As the First Law of Motion states..
An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
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What does this mean?
This means that there is a natural tendency of objects to keep on doing what they're doing. All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion.
This law is the same reason why you should always wear your seatbelt. :)
Wondering how Isaac Newton came up with this idea?
Click this funny animation below----have fun! :)
EXPERIMENT TIME!!!
This means that there is a natural tendency of objects to keep on doing what they're doing. All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion.EXPERIMENT TIME!!!
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