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Scalar quantity
quantity that has a magnitude (size) only
Examples of scalar quantities
Speed, temperature, mass, energy, distance, density
Vector quantity
quantity that has a magnitude and direction
Examples of vector quantities
Velocity, force, displacement, acceleration, momentum
Representing vector quantities
Vectors are represented by an arrow to indicate its size and direction
Contact forces
Forces between two objects that are physically touching each other
Examples of contact forces
friction, air resistance, tension
Non-contact forces
Forces between two objects that are not physically touching each other
Examples of non-contact forces
gravitational force, electrostatic force, magnetic force
Free body diagram
A diagram showing all the forces acting on an object
Friction
contact force that always opposes the motion of an object
Note 
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