### Mechanics Exercises Physlet-Based Curriculum

#### Chapter Exercises:

 7.1.1: An animation of a red car moving to the right, hitting a wall and then moving backwards to the left is shown. Also shown is one of four possible graphs depicting the car’s position as a function of time. The middle panel shows a cursor on a position vs. time graph. 7.1.2: A heavy ball is attached to a string and swung in a circular path in a horizontal plane as shown in the animation. At the point indicated the string suddenly breaks at the ball. Four animations represent possible results when the string breaks. 7.1.3:  Two blocks are pushed by identical forces, each starting at rest at the first vertical rectangle (start). The mass m1=2m2. 7.1.4: A spring that is attached to the end of a cart is compressed, and the cart is placed next to another cart on a low-friction track. The spring is released such that the two carts are “pushed” apart as shown in the animations. The graphs depict the motion in the x direction of the individual masses as a function of time. 7.1.5: Two identical black masses, m, are hung via massless strings over two pulleys of identical mass M and radius R, but different mass distributions. The bearings in the pulleys are frictionless and the strings do not slip as they unwind from their pulleys. The mass in the second simulation hits the floor first. 7.1.6: Shown is an adaptation of Galileo’s data of the angle between Jupiter and its moon Callisto. 7.1.7: A ball on an air track is attached to a compressed spring as shown in the animations (position is in meters and time is in seconds). Each of the 5 graphs CORRECTLY show a different property of the motion of the ball. 7.1.8: The simulations show disturbances on two identical strings (position is in centimeters and time is in seconds). Simulation 1 shows two Gaussian-shaped waves of identical amplitude and width, simulation two shows two Gaussian-shaped waves of equal and opposite amplitude and equal width.