# Physics 1401

## Online Quiz 3

### Chapter 4 in Conceptual Physics 12th edition

Question 1. If a cart experiences a net force of 80 N right and has a mass of 40 kg, then it will have an acceleration (in m/s²) of
(a) 1 left    (b) 2 right     (c) 3 right     (d) 5 left     (e) 10 right

Question 2. What is the acceleration (in m/s²) of a 10-kg pail of cement that is pulled upward with a force of 120 N?
(a) 0     (b) 2 up     (c) 2 down     (d) 5 up     (e) 5 down

Question 3. Gravity on the moon is 10/6 m/s². The weight (in N) of a 6-kg object on the moon is
(a) 0     (b) 2     (c) 6     (d) 10     (e) 60

Question 4. The weight (in N) of the same 6-kg object on the earth is
(a) 0     (b) 2     (c) 6     (d) 10     (e) 60

Question 5. A 1-kg rock is thrown at 10 m/s straight up. Neglecting air resistance, the net force (in N) on the rock when it is halfway to the top of its trajectory is
(a) 0     (b) 5 up     (c) 5 down     (d) 10 up     (e) 10 down

Question 6. If we do not ignore air resistance, then as a 600-N skydiver falls faster and faster through the air, her acceleration
(a) increases     (b) decreases     (c) remains the same

Question 7. At terminal velocity the force of gravity (in N) on our skydiver from question 6 will be
(a) 0     (b) 300 up     (c) 300 down     (d) 600 up     (e) 600 down

Question 8. At terminal velocity the force of air resistance (in N) on the skydiver from question 6 will be
(a) 0     (b) 300 up     (c) 300 down     (d) 600 up     (e) 600 down

Question 9. At terminal velocity a spring scale hooked between the skydiver's support harness and the parachute rigging would show a weight (in N) of
(a) 0     (b) 300     (c) 600     (d) 900     (e) 1200

Question 10. If we could "turn off" air resistance completely, then the spring scale from question 9 would show that the skydiver's weight (in N) would be
(a) 0     (b) 300     (c) 600     (d) 900     (e) 1200

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