1. Two astronauts are playing catch with a ball in space. The first astronaut throws the ball; and
A. the ball doesn’t move, but the astronaut does.
B. the ball moves, and so does the astronaut.
C. the ball doesn’t move, and neither does the astronaut.
2. Newton's second law states that F = m x a (Force is mass times acceleration). Which example would have the GREATEST acceleration?
A. a 50 kg student launched by a 100 Newton catapult
B. a 500 kg car accelerated by 1000 Newtons from the engine
C. a 10 kg ball thrown with a 50 Newton force
3. According to Newton's Third Law, what is the equal and opposite force to the downward force of gravity pulling on a man standing on the beach?
A. the force of friction holding the man still
B. the man pulling upward on the earth
C. the surrounding air pressure keeping the man in equilibrium
please help