Newtons laws
- Created by: Thea Strickland
- Created on: 04-01-21 11:11
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- Newtons laws
- Inertia
- Inertia is how hard it is to change the motion of an object.
- A large object with a large mass will find it very difficult to move, accelerate, decelerate or change direction quickly, because it will have a large inertia.
- 1st law
- Forces are balanced – object remains stationary/has constant velocity.
- A body will remain at rest, or continue to move with a constant velocity, unless acted upon by an external(resultant) force.
- Resultant force
- Resultant force is the overall force acting on an object.
- All forces have a direction (unless they’re zero) and are measured in Newtons (N).
- If forces act in the same direction add them. If forces are in opposite directions subtract them.
- If the resultant force is zero then the forces are balanced.l
- 2nd law
- Acceleration is directly proportional to resultant force.
- Resultant Force = Mass x Acceleration
- F = m x a
- Mass and Weight
- Mass and weight are NOT the same thing! Make sure you know the definitions.
- Mass- is measured of how much 'matter' an object has, its measured in kg
- Weight is a measure of how large the force of gravity is on an object, its measured in N
- Weight is calculated by: Weight = mass x gravitational field strength W = m x g
- Mass and weight are NOT the same thing! Make sure you know the definitions.
- 3rd law
- Equal and opposite actions.
- In an interaction between 2 objects (A and B) the force exerted by object A on object B is equal and oppositeto the force exerted by object B on object A.
- Interaction pairs act on different objects so the DO NOT cancel out! We can draw them as free body diagrams.
- Inertia
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