AP Physies P1. Energy. Version force Fat an angle 0 above the horizontalis used

Question

AP Physies P1. Energy. Version force Fat an angle 0 above the horizontalis used to pull a suitcase weight m d along a level constant gadistance between the floor velocity. The coefficient af friction The work done by the frictional force is (A) -Fa cos 2. A ball is thrown vertically upwards with a velocity v and an nitial kinetic energy Ext. When half the top of its flight, it has a ve ocity and kinetic energy respectively of (B) Rank these hit the ground below (some may be equal to each other) Greatest 1 2 5 6 Least 3. From the top ofa high cliff, a thrown horizontall initial s Which of the following with OR,The speed is the same for all these arrows but not zero. etic energy Kasa graphs best represents OR The speed is zero for all these arrow function OR, We cannot determine theranking for the speeds of the Amanda and Bertha are in a car race. Their cars have the 9, CA) OBO same mass. At one point in the race, they both change their speeds by 10 m/s in seconds, Ignore air friction. 4. Achild pushes borizontallyon a box of mass m which mov Amanda Ga) Is the work that Amand car does while speeding u a greater than, less than, or the same as the work that Bertha car does while speeding up? Explain. constant speed v across a horizontal floor. The coefficient of friction between the box and the floor is At what rate does the child do work on the box? (b) Ls the power generated by Amanda's car while speeding up greater than, less than, or the same as the power generated by Bertha's car while speeding up? Explain. An object is dropped from rest from a certain height. Air resistance is negligible. After falling a distance d, the object's kinetic energy is proportional to which of the following? CA) 1/2d (B)1/deo va 10, (a) How high a bill cana car coast up if friction is negligible and its initial speed is 20 m/s 6.A. pushes a block of mass M 6.0 kg with a constant of 5.0 m/s straight up a flat surface inclined 30.0" above the horizontal. The coefficient of kinetic friction between the observed to coast up a car with an initial speed of 20 m/s bill to a vertical distance 16.0 m above its block and the surface is ao 40. What is the net force acting on the block? tarting point, how much thermal energywas generated by CA) o is If the car coasts to a stop after moving vertically 16m, what the average foree of friction if the hill has a slope 2.50 above the horizontal? 7. A 10 kg box initially at rest is pushed a dista of 8 m along smooth horizontal floor. nce force on A graph of the applied horizontal the block as a function of displacement is shown below in Newtons 11. How fast must a 2.7g ping-pong ball move in order to have the same kinetic energy as a 145 g baseball moving at3LO m/s? 12.The figure below shows an Atwood machine with two masses (ms and mz) initially at rest at the same beight. After they are released, the large mass, ma, falls a distance hand hits the floor, while the small mass, m.,rises the same distance h. A student calculates that the work done by the applied force during the first 2 meters was 4 Joules and that the uring the fol owing 3 meters was 6 Joules. work done What, if anything, is wrong with this Ifsomething is wrong, identity it and explain how to correct it. 8. In each case below. an arrow has been shot from the top of a building either up at a 45 angle, straight out borizontally own at a 45° angle. Allarrows are identical and are shot at the same speed, and the heights of the buildings and the direction the arrows are shot are given. air resistance. ignore Find the speed of the mass just before m2 lands. meters, ma 3 kilograms, and m2-4 kilograms. Assamme the ropes and pulley have negligible mass and thai friction can be ignored.

Explanation / Answer

Since they are from different heights, final velocity is given by v = sqrt(2*g*h)

So, Order of speeds is

3=6>1=5>2=4

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