AP Physics Newton's Laws Practice Quiz Answers

_____6. What is the weight of a 90 kg Physics teacher?
A. 90 kg.
B. 882 N.
C. 198 N.
D. 90 N.
E. 9.8 N.
_____7. A 0.3 kg hockey puck slides horizontally to the right on frictionless ice at a constant 20 m/s.
What is the net force on the puck?
A. 6.0 N to the right
B. 6.0 N to the left
C. 3.0 N to the right
D. 3.0 N to the left
E. 0.0 N
_____8. A train going at constant velocity hits a cow on the tracks. Which of the following is correct?
A. The cow experienced the greatest force.
B. The train experienced the smallest force.
C. The train had the greatest acceleration.
D. All of the above.
E. None of the above.
_____9. There are two horizontal forces on the 4.0 kg box in the overhead view below but only one is
shown. The box moves strictly along the x axis. If the acceleration is 15 m/s/s to the right, what is the
magnitude and direction of the second force?
A. 20 N to the right.
B. 20 N to the left.
C. 40 N to the right.
D. 40 N to the left.
E. 0 N.
_____10. When the frictionless system shown above is accelerated by an applied force of magnitude F,
the tension in the string between the blocks is (A) 2 F (B) F (C) (1/3)F (D) 0.5F
(E) (2/3)F