EXAM QUESTIONS AND ANSWERS
100% CORRECT!
Contact force examples - ANSWER friction / air resistance / tension
Non-contact force examples - ANSWER Magnetic force / gravitational force /
electrostatic force
Scalar examples - ANSWER Mass / temperature / time / distance / speed / energy
vector examples - ANSWER Displacement / velocity / force / acceleration / momentum /
weight
Scalar quantity - ANSWER A quantity that has magnitude but no direction
Vector quantity - ANSWER A quantity that has both magnitude and direction
Newton's First Law - ANSWER An object at rest stays at rest and an object in motion
stays in motion with the same velocity unless acted upon by an external force.
Newton's Second Law - ANSWER F=ma
Newton's Third Law - ANSWER For every action force there is an equal and opposite
reaction force
Conditions for terminal velocity - ANSWER Driving force is constant / Friction or drag
force that increases with speed
Elastic collision - ANSWER Momentum and kinetic energy are conserved
Inelastic collision - ANSWER Momentum is conserved but kinetic energy is not
Centre of mass - ANSWER The point where a single force on the body has no turning
effect