Forces

• Friction: The force that opposes the motion of two surfaces that are in contact with each other, is a force that will slow down a moving object due to two surfaces rubbing on one another.
• Drag and friction are forces so they are measured in Newton (N).
• Drag and friction a contact forces.
• Contact force is the force that is exerted between two objects that are in contact with each other.
• Non-contact force: A force that does not involve physical contact between two objects.
• A moment is measured in Newton meters.
• Calculation of moment: Moment(Nm) = force(N) x distance from the pivot(m)