1. Two people are pulling on the ends of a rope. Each person pulls with a force of 100 N. The tension in the rope is:
(A) 0 N (B) 50 N (C) 100 N (D) 141
... [Show More] N (E) 200 N
2. A block of mass 5 kilograms lies on an inclined plane, as shown above. The horizontal and vertical
supports for the plane have lengths of 4 meters and 3 meters, respectively. The coefficient of friction
between the plane and the block is 0.3. The magnitude of the force F necessary to pull the block up
the plane with constant speed is most nearly
(A) 30 N (B) 46 N (C) 49 N (D) 50 N (E) 42 N
3-4: A block of mass m is accelerated across a rough surface by a force of magnitude F that is
exerted at an angle φ with the horizontal, as shown above. The frictional force on the
block exerted by the surface has magnitude f.
3. What is the acceleration of the block?
(A) F/m (B) (Fcosφ–f)/m (C) (F–f)/m (D) (Fcosφ)/m (E) (Fsinφ–mg)/m
4. What is the coefficient of friction between the block and the surface?
(A) f/mg (B) f/(mg–Fsinφ) (C) (mg–Fcosφ)/f (D) f/(mg–Fcosφ) (E) mg/f
5. One end of a massless rope is attached to a mass m; the other end is attached to a mass of 1.00 kg. The rope is
hung over a massless frictionless pulley as shown in the accompanying figure. Mass m accelerates downward
at 5.0 m/s2. What is m?
(A) 3.0 kg (B) 2.0 kg (C) 1.5 kg (D) 1.0 kg (E) 0.5 kg
6. A student pulls a wooden box along a rough horizontal floor at constant speed by means of
a force P as shown to the right. Which of the following must be true?
(A) P > f and N < W.
(B) P > f and N = W.
(C) P = f and N > W.
(D) P = f and N = W.
(E) P < f and N = W.
7. A block of mass 3 kg, initially at rest, is pulled along a frictionless, horizontal surface with a force
shown as a function of time t by the graph above.
The acceleration of the block at t = 2 s is
(A) 3/4 m/s2 (B) 4/3 m/s2 (C) 2 m/s2 (D) 8 m/s2 (E) 12 m/s2
8. Two blocks of mass 1.0 kg and 3.0 kg are connected by a string which has a tension of 2.0 N. A force F acts in the direction shown
to the right. Assuming friction is negligible, what is the value of F?
(A) 1.0 N (B) 2.0 N (C) 4.0 N (D) 6.0 N (E) 8.0 N
9. Two blocks X and Y are in contact on a horizontal frictionless surface. A 36 N constant force is applied to X as shown to the right.
The force exerted by X on Y is:
(A) 1.5 N (B) 6.0 N (C) 29 N (D) 30 N (E) 36 N
10. A string with masses of 1.5 kg and 3.0 kg on its ends is hung over a frictionless, massless pulley as shown
to the right. What is the approximate magnitude of the acceleration of the masses?
(A) 1.5 m/s2 (B) 3.0 m/s2 (C) 3.3 m/s2 (D) 6.7 m/s2 (E) 10 m/s2
11. Two boxes are accelerated to the right on a frictionless horizontal surface as shown. The larger box has a mass of 9 kilograms and
the smaller box has a mass of 3 kilograms. If a 24 newton horizontal force pulls on the larger box, with what force does the
larger box pull on the smaller box?
(A) 3 N (B) 6 N (C) 8 N (D) 18 N (E) 24 N
12.. A force of 6 newtons and a force of 10 newtons can be combine to form a possible resultant with a
magnitude of which of the following
(A) 0 newtons (B) 2 newtons (C) 8 newtons (D) 20 newtons (E) 60 newtons
Questions 13-14 A 5 kg block rests on a flat plane inclined at an angle of 30o to the horizon as shown in the diagram below.
13. What would be the acceleration of the block down the plane assuming the force of friction is negligible?
(A) 0.5 m/s2 (B) 0.87 m/s2 (C) 5 m/s2 (D) 8.7 m/s2 (E) 10 m/s2
14. If the block is placed on a second plane (where friction is significant) inclined at the same angle, it will begin to accelerate at 2.0
m/s2. What is the force of friction between the block and the second inclined plane?
(A) 10 N (B) 15 N (C) 25 N (D) 43.3 N (E) 50 N
15. A [Show Less]