Name: ______Date: ______Period: ______

Level Physics: Work, Energy, and Power Test Review 2017

  1. A 1253 kg boulder rolls down a hill. How much kinetic energy will it have when its velocity is 3.2 m/s?
  1. Carl weighs 525 N and the staircase is 9.00 m tall. He runs to the top of the staircase in 5.80 sec. Calculate the power Sam produced.
  1. Describe, using full sentences, a situation where potential energy can be converted to kinetic energy?
  1. As an object moves uphill, its kinetic energy is decreasing. What is happening to its potential energy?
  1. What variable in the equation , determines how much gravitational potential energy a plane has as it flies over you?
  1. How far did the soccer ball go if Devon kicked it with a force of 62.7 N, and 1750 J of work were done?
  1. An object with a mass of 9 kg slides at a constant speed on a frictionless surface for 10m. How much work is done? (think this one through!)
  1. A bird (with mass 2.1 kg) is flying in the air at a speed of 13 m/s. The bird approaches abuilding with mirrored windows and, sadly, runs straight into the building. What is the bird’s kinetic energy when flying?
  1. Mr. K is pushing a shopping cart full of food up a hill at a constant velocity. Was the energy Mr. K used conserved? Or did it increase or decrease. Explain your answer in full detail.
  1. Which type of energy is shown by a stretched out bow and arrow?
  1. A Brontosaurus is eating and finds out you are in his food. He is a vegetarian so he spits your 82.5 kg body out. His mouth is 25.0 m above the ground when this happens. How much gravitational potential energy do you have as you start to fall?
  1. Calculate the rate of work done by a 3.2 N force pushing a 0.25 kg sandwich across a table 0.75 m wide in 5 sec.
  1. The tyrannosaurus rolls a rock up a hill, where it rests at the top. This is an example of transferring ______energy to ______energy.
  1. If it takes 17 N to move a box, how long will it take a 23 W motor to move that same box 7 m?
  1. Find the potential energy in a textbook that is lying on a table of height 1.1 m from the ground, if the textbook has a mass of 1.7 kg.
  1. A marble starts from rest and rolls down an inclined plane. Ignore Friction. This is an example of ______.
  1. Use the information from Question 8 for the following.

What is the bird’s kinetic energy after running into the window?

  1. A bungee jumper rapidly decelerates as he reaches the end of his spring-like bungee cord. Ignore air resistance. What forces are acting on him and is his energy conserved? Use full sentences.
  1. You trip and fall off a 25 m cliff. Use conservation of energy to figure out how fast you will be going when you hit the ground. (Ignore air friction of course.)
  1. Calculate the work done by a 62 N force pushing a pen over a distance of 1.75 m.
  1. Eric runs to the top of a 23.0 meter staircase and produces 6700 W of power. How long did it take him to reach the top of the staircase if he weighs 725N?
  1. In the picture below, where would the roller coaster cart have the greatest potential energy? Where would it have the greatest kinetic energy? Where would it have about 50% KE and 50% PE?
  1. A baseball bat hits a baseball with energy 2750 J. If all of the energy is transferred, find the mass of the baseball if its velocity is 17 m/s after the hit.
  1. A man is pushing against a brick wall. No work is being done because... (use complete sentences!)
  1. Use the information from Question 8 to answer the following.

How much work did the window do on the bird?