Physics Forces
- Created by: giraffe007
- Created on: 07-10-16 18:39
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- Force Basics
- Weight mass and gravity
- Gravitational Forces
- Gravity attracts all masses, you only notice it when one or more of the masses are huge aka a planet. Anything near a planet or star is attracted to it very strongly
- Two important effects:
- on the surface of a planet, it makes all things accelerate towards the ground
- Gives everything a weight
- Weight and mass= not the same
- mass is amount of stuff in object. Same value anywhere in universe
- Weight= force acting on object due to gravity (gravitational pull force on the object).
- Force is caused by gravitation fields + the size of force depends on gravitational field strength.
- Gravitational field strengths
- Varies with location, the closer you are to the mass causing the field, the stronger it is +stronger for larger masses/
- Weight of an object changes with location
- Varies with location, the closer you are to the mass causing the field, the stronger it is +stronger for larger masses/
- Gravitational field strengths
- Can change depending where is 1kg on earth =9.8N, on moon =1.6N.
- Force is caused by gravitation fields + the size of force depends on gravitational field strength.
- Measuring Weight
- Weight is measured in newtons
- Aciting from a single point of object + centre of mass
- Centre of mass = a point at which you assume the whole mass is concentrated. For uniform object, sanme density throughout and regular shape= centre of object
- Aciting from a single point of object + centre of mass
- Measured using a newton meter
- Mass measure in kilograms on mass balance
- Calculatinweight
- W=mg
- Weight is measured in newtons
- Gravitational Forces
- Physics Forces
- Forces and their effects
- Forces and elasticity
- Investigating springs
- Past Papers
- Forces and their effects
- Contact and Non-contact forces
- Vectors
- have size and direction
- e.g force, velocity, displacement,acceleration, momentum
- represented by an arrow, length shows magnitude, directions shows direction of quantity
- have size and direction
- Scalars
- Have size
- e.g speed, distance, mass , temp. ,time
- Have size
- A force is a push or pull on an object that is caused by interacting with something. All forces either contact or non contacts
- When 2 objects touch for a force to act = contact. e.g friction, air resistance, tension in rope, normal contact force
- when 2 object don't need to touch for the force to act= non-constant. e.g magnetic forces, gravitational forces, and electrostatics.
- When 2 forces interact, there is a force produced on both sides. equal and opposite (newton 3rd law)
- Vectors
- Resultant Forces
- if you have a number of forces acting at the same point you can replace them with a single force that has the same effect. The single force is the resultant force
- Determinin the resultant force.
- If the forces on an object, act along the same line , the resultant force is found by finding sum of all forces.
- Free body diagrams
- Work Done
- Weight mass and gravity
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