Physics- Contact and Non-Contact forces
- Created by: zaynab_ramzan
- Created on: 22-11-17 17:30
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- Contact and Non-Contact Forces
- Vector Quantity
- Vector quantities have a magnitude and a direction
- Lots of physical quantities are vector quantities
- Vector quantities: force, velocity, displacement, acceleration, momentum etc.
- Vectors are usually represented by an arrow - the length of the arrow shows the magnitude, and the direction of the arrow shows the direction of the quantity.
- Velocity is a vector
- Force is a vector quantity
- Scalar Quantity
- Some physical quantities only have magnitude and no direction. These are called scalar quantities
- Scalar Quantities: speed, distance, mass, temperature, time, etc.
- Speed is a scalar quantity
- Contact forces
- A force in which two objects have to be touching for a force to act
- E.g. friction, air resistance, tension in ropes, normal contact force, etc.
- Forces
- A force is a push or a pull on an object that is caused by it interacting with something
- All forces are either contact or non-contact forces
- When two objects interact, there is a force produced on both objects
- An interaction pair is a pair of forces that are equal and opposite and act on two interacting objects.
- Non-contact forces
- A force in which objects do not need to be touching for the force to act
- E.g. magnetic force, gravitational force, electrostatic force, etc.
- Vector Quantity
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