newton's laws of motion notes

8/10/2019 Newton's Laws of Motion Notes

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What this means: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.

For Example

For example: if there were two people on two different straight platforms, and were both to run at the

same speed both at the same position and time of departure. Although there is one platform cut short

and the person would fall into the abyss below. if the pair travelling the same distance and both at the

same position will continue to travel to the end at the same speed, even if there is the absence of the

platform for one of the pair. Once the Individual falls off the platform at the same speed with the other

person, he would fall with the same velocity with the individual continually running. Though the

individual falling will gain velocity along the vertical axis, it would remain at the same speed of its

horizontal axis.

Newtons second law

Acceleration is produced when a force acts ona mass. The greater the mass (of the object being

accelerated), the greater the amount of force needed (to accelerate the object).

What this means:Everyone unconsciously knows the Second Law. Everyone knows that heavier

objects require more force to move the same distance as lighter objects. F=ma

For Example:

If you want to calculate the acceleration of the dog pulling the sled, you firstly need to edit and modify

the force equation ( a = F/m ). If the force was 100N while the mass remained 50kg. The acceleration

would be 2 m/s2

Now if you add another dog to the team and added another dog which pulled at the same force ( 100N)

it would result n 200N. If it were to be calculated upon the 50 kg mass, it would result with acceleration

of (4 m/s2). The reason for this is because with a second dog, the acceleration is increased.

If this is applied again but on both sides of the object. if a force of 200N is applied on both sides of the

object its acceleration is 0 m/s due to the force pulled on both sides.

Newtons third law

For every action there is an equal and opposite re-action.


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What this means: 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.

For Example:

If a ball approaches the ground with force, it bounces upwards with the same force which is

applied. Also when walking, as from each step you take, your foot reaches the ground with

force . As your foot is lifted, the same force is exerted lifting the foot up.

newton's laws of motion notes

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