In the ski jump event at the Winter Olympics, skiers jump from a ramp on the top of a 90 m tall hill. If a skier has a mass of 60 kg and lunches of the ramp at 20 m/s. At this point calculate the skiers potential energy, kinetic energy and mechanical energy

A ball is thrown upward in the air. Neglect air resistance. As it travels upward, a)  Both its kinetic energy and potential energy increase. b)  Its kinetic energy increases and potential energy decreases. c)  Its kinetic energy decreases and potential energy increases. d)  Both its kinetic energy and potential energy decreases.

Energy (1).pdf 2 / 3 T Problem 9: A 3 kg block is pushed 3 m up a 30° incline by a 50 N force aligned parallel to the ramp. The coefficient of kinetic friction between the ramp and the block is 0.2. a) Calculate the work done by gravity. b) Calculate the work done by the applied force. c) Calculate the work done by the normal force. d) Calculate the work done by the friction force. e) Calculate the net work done on the block. f) Find the speed of the block after traveling this distance. Assume it started at rest. 110% Pr TI re W sp ha A: ar ax Pr A pe of re

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C7 17.) A 1 kg block (block A) is released from rest at the top of a 20 m long frictionless ramp that is 7 m high. At the same time, an identical block (block B) is released next to the ramp so that it drops straight down the same 7 m. Find the values for each of the following for the blocks just before they reach ground level. (a) gravitational potential energy Block A ______________ J Block B  ______________ J (b) kinetic energy Block A ____________________ J Block B ____________________ J (c) speed Block A ____________________ m/s Block B ____________________ m/s (d) momentum Block A _______________________ kg·m/s Block B _______________________ kg·m/s

1. A student of mass 40 kg caries a bag weighing 5000g from the ground floor to his class on the first floor that is 700 cm high. The work done by the boy is = 2. The above diagram shows a cyclist at different positions as she cycles over a humpback bridge. The cyclist has maximum Kinetic Energy at • and maximum Potential energy at 3. A body moves a distance of 15 m along a straight line under the action of 25 N force. If work done is 45 J, then angle between the force and direction of motion of the body will be = 4. How much is the work done in pulling up a block of wood weighing 300 N for a length of 300 cm on a smooth plane inclined at an angle of 35° with the horizontal? Answer =

When a roller coaster is at the top of a steep hill, its potential energy is maximum. When it hurdles down the slope and comes to the bottom, the potential energy reduces greatly. Hence we can say that the law of conservation of energy is not valid here since energy is destroyed. a) True b) False

Discuss Potential Energy Diagrams Given Below: UpF Uc UB UA 0. 1 3. 4 6. 7 8 6. x (m)

A 3500 lb SUV is traveling at 30 mph up a 6% slope when the engine quits. Use work and energy to determine the distance traveled until the vehicle comes to rest (at which point the parking brake is applied). Assume drag forces are negligible.