1 .		A bowling ball is lifted from rest onto a shelf by an external agent (position is in meters and time is in seconds). Rank the paths by the amount of work done by gravity on the bowling ball. Start animation 1 Start animation 2 Start animation 3 Start animation 4 [Hint]   Animation 1   Animation 2   Animation 3   Animation 4   All Tie
2 .		A bowling ball is lifted from rest onto a shelf by an external agent (position is in meters and time is in seconds). Rank the paths by the amount of work done by the external agent on the bowling ball. Start animation 1 Start animation 2 Start animation 3 Start animation 4 [Hint]   Animation 1   Animation 2   Animation 3   Animation 4   All Tie
3 .		A 12 kg box slides up a 30o frictionless ramp at constant speed as shown in the animation  (position is in meters and time is in seconds). Note that both gravity and the hand do work on the box. What is the work done on the box by the external force (hand) and the total work done on the box during the animation? Start Interactive Hint [Hint]   -60 J / 0 J   60 J / 0 J   60 J /  60 J   0 J /  0 J
4 .		A 12 kg box slides down a 30o frictionless ramp at constant speed as shown in the animation  (position is in meters and time is in seconds). Note that both gravity and the hand do work on the box. What is the work done on the box by the external force (hand) and the total work done on the box during the animation? Start [Hint]   60 J / 0 J   -60 J / 0 J   60 J / 60 J   0 J / 0 J
5 .		A 2 kg hammer strikes a 1.5 gram nail as shown in the animation (position given in centimeters and time is in seconds). Determine the average force exerted on the nail by the hammer.   Start [Hint]   .17 N   .0001 N   0 N   1.2N
6 .		A mass of 2 kg is in a rather large bowl and moves as depicted in the above animation (mouse click for position given in meters and time is in seconds). Determine the velocity of the mass at the bottom of the bowl.   Start [Hint]   v=5.4m/s.   v=7.7m/s.   v=5.1m/s.   v=5.0m/s.
7 .		Three balls are thrown off the top of a building, all with the same speed but different launch angles (position is in meters and time is in seconds). Rank the three balls according to which one hits the ground first and which one has the greatest speed upon impact with the ground. Start [Hint]   red, red   red, green   red, blue   red, all tie
8 .		A 1.5 kg brick falls a given height onto a 15 gram spike as shown in the animation (position is in meters and time is in seconds). Determine the average force exerted on the nail by the brick.   Start [Hint]   161.7 N   176.4 N   1.76 N   225 N
9 .		A 12 kg box slides down a rough ramp at constant speed as shown in the animation   (position is in meters and time is in seconds). Note that both gravity and friction do work on the box. What is the work done on the box by friction while it is in motion? Start Interactive Hint [Hint]   60 J   -60 J   0 J   -120 J
10 .		A  ball on an air track is attached to a compressed  spring (at x=0 the spring is unstretched) as shown in the animation (position is in meters and time is in seconds). Determine which area properly represents the work done by the spring during the animation (assume v=0 at the beginning and end of the animation).  Start [Hint]   Graph 1   Graph 2   Graph 3   Graph 4
11 .		A 25 gram projectile is shot from a spring gun off a table as shown in the animation (position is in meters and time is in seconds). Ignore air friction. However, there is friction in the barrel of the gun. If the spring constant of the spring is k=200 N/m what is the average force exerted by friction when the projectile is in the barrel of the gun?   Start [Hint]   10.9 N   -10.9 N   -11.2 N/m   19 N
12 .		A 1.5 kg cart resting on an air track oscillates as shown in the animation (position is in meters and time is in seconds). If the spring constant is k = 10 N/m determine the coefficient of kinetic friction. Start Interactive Hint [Hint]   2.1   0.5   0.32   0.22
13 .		A mass of 2kg is in a rather large bowl and slides subject to friction as depicted in the above animation (mouse click in the animation for position given in meters and time is in seconds). Determine the percent of the initial energy lost during the time intervals: (0-5.5s) and (5.5-12.7s).  Start [Hint]   v=54.4% / 18%.   v=54.4% / 45.6%.   45.6% / 53.3%.   45.6% / 28.3%.
14 .		Use conservation of energy to determine the speed of the pendulum bob when it is at its lowest point (assume negligible loss of energy due to air resistance; position is shown in meters and time is in seconds). Start [Hint]   3.4 m/s   0.63 m/s   1.7 m/s   Not enough information; the mass of the pendulum is needed to solve the problem.
15 .		Determine the energy  loss due to air resistance of a 2 kg pendulum bob depicted in the above animation (position is shown in meters and time is in seconds).  Start [Hint]   5 J   1.1 J   -1.1 J   0 J