Your car is stuck and you and your friend decide to pull it out using a rope. Yo

Question

Your car is stuck and you and your friend decide to pull it out using a rope. You say you should tie one end of the rope to the car while you and your friend both pull together on the other end of rope. your friend says you should tie the middle of the rope to the car, so that the rope makes a "V'. He will pull on one end while you pull on the other end. Assuming you can both pull with the same force regardless of which way you tie the rope, which method will result in the greatest net force being applied to the car? A) Your way - both of you pulling in the same direction B) Your friend's way - the two of you pulling at a "V" angle with respect to one another C) Both ways result in the same non-zero net force on the car D) The net force on the car will be zero regardless of how you pull Two boxes of masses m and 2m are in contact with each other on a frictionless surface. (See Fig. 4-3.) What is the acceleration of the more massive box? A) F/m B) F/(4m) C F/(3m) D) F/(2m) You observe a hockey puck sliding across the ice. The puck eventually stops away from the wall or any other barrier. This is most likely because: A) the puck ran out of speed B) a force suddenly acted on the puck which made it stop C) a small friction force was acting on the puck the whole time D) the puck did not have any net force to keep it going A 4.0-kg mass and a 1.0-kg mass are moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping? A) the 1.0-kg mass B) the 4.0-kg mass C) Both travel the same distance. D) cannot be determined from the information given Two identical books rest on different surfaces. One book rests on a horizontal surface, while the other book rests on an incline. Which of the books is experiencing the greatest normal force on it? A) the one on the horizontal surface B) the one on the inclined surface C) they both have the same non-zero normal force D) they both have zero normal force because they are not moving. A car accelerates from rest to a forward speed. What force causes this acceleration? A) The force of the engine on the car B) The force of the tires on the road C) The force of the road pushing the tires forward D) There is no net force on the car

Explanation / Answer

1) b) your friends way- the two of you pulling at a V angle with respect to one another..

2) c) F/2m as we know force = mass x acceleration. here total combine mass will act ie 3m

3) c) a small friction force was acting on the puck the whole time

4) b) the 4.0 kg mass. when brakes is applied as same force in both case but in case of 4.0 kg mass the momemtum is greater than 1 kg mass , so the 4 kg object will go much before stop than 1 kg object

5) a) the one on the horizontal surface because this case normal force is the weight of the book ie mg .. but for an inclined angle it become mgsin(theta)

6 ) c) the force of the road pushing the tires forward

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