Physics P2 - Newton’s Laws of Motion

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Newton's Laws of Motion
Newton's three laws of motion:
I. Every object in a state of uniform motion tends to remain in that state of
motion unless an external force is applied to it.
II. The relationship between an object's mass m, its acceleration a, and the
applied force F is F = ma. Acceleration and force are vectors (as indicated
by their symbols being displayed in slant bold font); in this law the
direction of the force vector is the same as the direction of the
acceleration vector.
III. For every action there is an equal and opposite reaction.
Newton's three laws of motion in my own words:
1. Motion (or lack of motion) tends to stay the same unless there is
external force applied to it. So an object will stay stationary unless
you apply extra force to it.
2. If you exert the same magnitude of force on two objects with
different masses the acceleration will be different, you will get
different changes in motion. Therefore F=MA, rearranged we have
A=F/M
3. Forces are found in pairs, acting forces encounter other forces in the
opposite direction, so when an object is stationary the forces acting on it are equal
meaning it will not fall through the ground or suddenly fly up.
Examples of Newton's three laws of motion:
1. A car will stay stationary on the road unless you ignite the engine and apply driving
force onto the car making it go.
2. When a cannon is fired the same force is excreted on both the cannon and the
cannon ball, however due to the mass difference, the cannon ball has a greater
forward acceleration than the backward acceleration of the cannon.
3. When somebody is parachuting down gravity pulls him to the ground however there
is an opposite force of air resistance slowing him down, and later up thrust stops him
from breaking through the ground.

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