Transcript Jeopardy
Work and Machine Multiple choice Matching Short Answer 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500 machine What is a device that makes work easier by changing the size or direction of force? machine 100 b. inclined planes and levers Which of the following are simple machines used by the Egyptians to build pyramids? a. screws and screwdrivers b. inclined planes and levers c. plows and axes d. wheels and axles MC 100 f. first-class lever Match each item with the correct statement. a. pulley f. first-class lever b. wheel and axle g. second-class lever c. fulcrum h. third-class lever d. lever i. compound machine e. wedge j. inclined plane a lever where the fulcrum is between the input force and the load Matching 100 fixed, movable, and block and tackle Name the three types of pulleys. Short Answer 100 friction What causes machines not to be 100% efficient? Machine 200 C. Less force is needed to move the object over a longer distance. How does a ramp make lifting a heavy object easier? a. The object is moved over a shorter distance. b. The ramp increases the amount of work you do. c. Less force is needed to move the object over a longer distance. d. More force is needed to move the object over a longer distance. MC 200 g. second-class lever Match each item with the correct statement. a. pulley f. first-class lever b. wheel and axle g. second-class lever c. fulcrum h. third-class lever d. lever i. compound machine e. wedge j. inclined plane a lever where the load is between the input force and the fulcrum Match 200 The location of the fulcrum or what is located in the middle What is the main difference between the three classes of levers? Short Answer 200 The object must move and in the same direction as the force. What two things must happen for work to be done? Machine 300 d. ramp Which of the following is NOT a wedge? a. knife c. chisel b. plow d. ramp MC 300 i. compound machine Match each item with the correct statement. a. pulley f. first-class lever b. wheel and axle g. second-class lever c. fulcrum h. third-class lever d. lever i. compound machine e. wedge j. inclined plane a machine that is made of two or more simple machines Match 300 He is using a first-class lever. The hammer pivots on a fulcrum as the claw pulls out the nail. Pat is removing nails from a piece of wood with the claw end of hammer. What type of simple machine is he using? Explain. Short answer 300 work What is it called when a force causes an object to move in the direction of the force? Machine 400 c. the direction of a force What does a fixed pulley change? a. the speed of a force b. the size of a force c. the direction of a force d. the timing of the force MC 400 h. third-class lever Match each item with the correct statement. a. pulley f. first-class lever b. wheel and axle g. second-class lever c. fulcrum h. third-class lever d. lever i. compound machine e. wedge j. inclined plane a lever where the input force is between the fulcrum and the load Match 400 A pair of scissors is made of two simple machines. The blades of the scissors are wedges. The blades are also two first-class levers that are fastened together and pivot on a fulcrum. Explain why a pair of scissors is a compound machine. Short Answer 400 kinetic A moving object has what kind of energy? Machine 500 a. inclined plane What type of simple machine can a screw be considered? a. inclined plane b. lever c. wheel and axle d. pulley MC 500 b. wheel and axle Match each item with the correct statement. a. pulley f. first-class lever b. wheel and axle g. second-class lever c. fulcrum h. third-class lever d. lever i. compound machine e. wedge j. inclined plane a machine consisting of two circular objects of different sizes Match 500 Sample answer: The backpack is not moving in the same direction as the force being applied to it. When you are carrying your backpack to class at a constant speed, you are not doing work. Why not? Short Answer 500 Final Jeopardy!!!!! Two people are climbing stairs to reach the 6th floor of a building. One takes a set of steep stairs and the other takes a spiral staircase. Which person is doing more work. Explain. Neither, they are both doing the same amount of work. The spiral staircase is increasing the distance, so that person is using less force, but is doing the same amount of work as the person taking the steep staircase.