A 5kg block is lifted from rest by an external agent, then returned to its original position as shown in Animation 1 (position is in meters and time is in seconds). An identical block is pushed along the surface which has a coefficient of kinetic friction of  0.2. As with the first block, it is returned to its original position in Animation 2. Determine the work done by gravity in Animation 1 and the work done by friction in Animation 2.

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The above animation (mouse click in the animation for position given in meters and time is in seconds) of a green ball is allegedly a physical situation.  Determine whether the situation is physical and if so, what causes the green ball's motion. You may test your determination by resetting the animation and dragging the green ball to a new starting point within the animation.   Start

A 150 gram brick falls a given height onto a massless spring and platform as shown in the animation (position is in centimeters and time is in seconds).  Determine the spring constant of the spring.  Start

A 1.5 kg brick falls a given height onto a massless spring and platform as shown in the animation (position is in centimeters and time is in seconds). The animation is stopped as the brick leaves the spring. What maximum height (as measured from the ground) does the brick reach? Start

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 and friction in the barrel. What is the spring constant of the spring?   Start

A 0.5 kg box (shown in the animation with time in seconds and position in meters) slides on ice at constant speed for 1.5 seconds when it then encounters a rough surface. What is the work done by friction on the box? Start

Interactive Hint

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

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

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

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

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