- For any pair of interacting objects, the force exerted by the first object on the second object is equal in strength to the force that the second object exerts on the first, but in the opposite direction (Newton’s third law).
- The motion of an object is determined by the sum of the forces acting on it; if the total force on the object is not zero, its motion will change. The greater the mass of the object, the greater the force needed to achieve the same change in motion. For any given object, a larger force causes a larger change in motion.
- All positions of objects and the directions of forces and motions must be described in an arbitrarily chosen reference frame and arbitrarily chosen units of size. In order to share information with other people, these choices must also be shared.
- Do Now– Get out your science notebook and add to the Table of Contents- “What Forced to Accelerate p.85” (Right Side). Head page 85 properly with “Forced to Accelerate-Investigation-5/18/17.”
- Driving Question Summary Table– Complete the Summary Table on pages 80-81 for the “What causes motion” (Newton’s first law, inertia) activities on pages 82-83.
- Investigation– Forced to Accelerate- How is acceleration related to force?- Record key question and set up data table on page 85 of science notebook. Follow the procedure.