11. A single constant 10 pound force F1 acts on a body, causing it to accelerate
ID: 2133250 • Letter: 1
Question
11. A single constant 10 pound force F1 acts on a body, causing it to accelerate. Then, while F1 continues to act, a second constant force F2 is applied to the body, which comes to a momentary stop. The magnitude of F2 is:
A. exactly 10 pounds.
B. a bit less than 10 pounds.
C. zero.
D. not enough information to tell.
E. larger than 10 pounds.
_____________________________________________________________________________________________________12. Two bodies have quite different masses, but the net force applied to each of them is the same. The acceleration of:
A. each body is the same.
B. the less massive body is larger.
C. the more massive body is larger.
_______________________________________________________________________________
13. A book weighing 10 N is held at rest in the palm of the hand. The reaction to the force of the hand on the book is a force of:
A. 10 N exerted by the Earth on the book.
B. 0 N.
C. 10 N exerted by the book on the Earth.
D. 10 N exerted by the book on the hand.
_________________________________________________________________________________
14. The frictional force, due to air resistance, acting on an object is always:
A. in the direction of the objects motion.
B. greater than the net force.
C. smaller than object's weight
D. in the upward direction.
E. in the opposite direction to the objects motion.
_________________________________________________________
15. The erroneous idea that an object needs a force on it to keep moving even at constant velocity was held by:
A. Galileo.
B. Aristotle.
C. Newton.
Explanation / Answer
11.d
12.c
13.d
14.a
15.b
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