Distinguishing 2nd and 3rd Law forces
When a high jumper leaves the ground, what is the source of the upward force that
accelerates her? What force acts on her once her feet are no longer in contact with the
Does the spring scale read 0 N, 100 N, or 200 N?
Suppose two carts, one twice as massive as the other, fly apart when the compressed spring
that joins them is released.
Are these two forces, FSM and FEM, 2nd Law forces or 3rd Law
and class period (1-8)