Do Now:
Copy the Force-Body diagram of the object below.
Determine the net force acting on the body.
Calculate the acceleration of the body.
Homework to be Completed:
Finds, collect and bring in:
1 soda bottle
2 liter or 1 liter - no small
2 or 3 Styrofoam meat trays
Todays Agenda:
Review Do Now
Finish and Review Cash Crash
Class Notes: Newton’s Third Law - action and reaction
Newton’s Third Law
When one object exterts a force on a second object, the second object exerts and equal force on the first object in the opposite direction.
for every action there is an equal but opposite reaction.
action - the initial force
reaction - the equal but opposite push back
act on different objects (sketch)
because action and reaction act on different objects - they sometimes behave very differently.
Examples:
ball bounce
standing on floor
action and reaction make a force pair.
Forces always occur in pairs.
normal force is a reaction force to pushing against a surface