Remember when you were riding your bicycle as a little kid? You always pedaled really hard right before a big hill. Consider the conservation of energy and explain why you did this. #28 and #29 are challenge conceptual questions. This level of problem will not be assessed on the exam. Three identical blocks each take a different path from a height h to the ground. Block A is released from rest and falls vertically. Block B is released from rest and slides down a frictionless incline. Block C is projected horizontally with an initial speed v. Which block has had the greatest change in kinetic energy? Which block has the greatest kinetic energy just before it hits the ground? Which block has the greatest speed just before hitting the ground? A toy car is released from rest at point A, and the elevation of the release point is indicated by a dot-dash line. The car rolls along the curved frictionless track as shown. The car will jump off of the track at point B and follow the dotted-line projectile trajectory. After the car leaves the track and reaches the highest point in its trajectory, it will be at a different height than it was at point A. It make it back to its original height. doesn’t Briefly explain why this is so. No friction, no air resistance.
Remember when you were riding your bicycle as a little kid? You always pedaled really hard right before a big hill. Consider the conservation of energy and explain why you did this. #28 and #29 are challenge conceptual questions. This level of problem will not be assessed on the exam. Three identical blocks each take a different path from a height h to the ground. Block A is released from rest and falls vertically. Block B is released from rest and slides down a frictionless incline. Block C is projected horizontally with an initial speed v. Which block has had the greatest change in kinetic energy? Which block has the greatest kinetic energy just before it hits the ground? Which block has the greatest speed just before hitting the ground? A toy car is released from rest at point A, and the elevation of the release point is indicated by a dot-dash line. The car rolls along the curved frictionless track as shown. The car will jump off of the track at point B and follow the dotted-line projectile trajectory. After the car leaves the track and reaches the highest point in its trajectory, it will be at a different height than it was at point A. It doesn’t make it back to its original height. Briefly explain why this is so. No friction, no air resistance.
11_energyreview_2016.docx