Interaction
of forces and Momentum
Newton’s 3rd law: forces occur in pairs (action and reaction), Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first – or to every action there is always an equal and opposite reaction, 2 objects can feel the same force but have very different results,
Momentum: how much a moving object will resist a force, depends on mass and velocity (directly proportional), momentum = mv (inertia in motion, resistance to change);
Change in Momentum: Impulse = change in momentum = change in mv, Impulse related to both force and the time over which it acts, Ft = change in mv; momentum is conserved, elastic collision, inelastic collision
Describe
Explain how two objects can feel the same force but have very different results from that force. Give an example.
What are the two main factors that combine to produce the momentum of an object. How does Impulse relate to momentum? Explain why an Impulse exerted over a short time is stronger than one applied over a longer time. Give an example.