Simple Machines Unit Study Guide
Quiz by Cheryl McLawhorn
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9 questions
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- Q1Energy enables an object to do work. Work is done whena force is put on an object, and the object moves in the direction of the force.no force is put on an object, but the object moves at varying speeds in a random direction.no force is put on an object, and the object does not move in any direction.a force is put on an object, but the object does not move in any direction.120s
- Q2What is mechanical advantage?a characteristic that compound machines have and simple machines lacka measure of how much a machine multiplies the force applied to ita property of some machines that allows them to do work with no input forcea theory stating that machines are better at performing tasks than humans120s
- Q3Rubia was given a type of inclined plane called a ramp in her science class. Her teacher told her that the ramp should have a mechanical advantage of 3. Rubia pulled a block up the ramp, but afterward she calculated that the mechanical advantage of the ramp was 2.8 instead of 3. Her teacher said she did not make a mistake. What did Rubia calculate?the ideal operating power of the rampthe ideal mechanical advantage of the rampthe actual operating power of the rampthe actual mechanical advantage of the ramp120s
- Q4Adam uses a fixed pulley, such as the one shown above, to lift an object. Adam applies an input force to the pulley as he pulls down to lift the object. As he does this, Adam wonders about how the pulley is helping him. How is the pulley helping Adam lift the object?All of these answers are correct.A fixed pulley helps Adam change the direction of the effort force.A fixed pulley lowers the amount of force needed to do the same amount of work.A fixed pulley increases the distance over which the force is applied.120s
- Q5Jeffrey is using a pulley to get water from a well. He loops a rope over the top of a pulley wheel, then ties the rope to a bucket. He lowers the bucket into the water. To bring the bucket and water up from the well, Jeffrey pulls down on his end of the rope. Why does Jeffrey apply a pulling force to the rope?to test the tension in the rope before he uses it to climb down into the wellbecause work must be done on the pulley before it can do work on the bucketbecause adding his force to the force generated by the pulley will get the job done fasterto signal to the pulley to start drawing water from the well120s
- Q6Which of the following is an example of work being done on an object?A wagon is used to carry vegetables from a garden.A pulley is used to get water from a well.all of theseA hammer is used to remove a nail from a wall.120s
- Q7Andy's teacher asked him to come up to the front of the class to demonstrate work. Which of the following could Andy do in the classroom to demonstrate work?Andy pushes a desk across the floor.Andy sits in his chair, doing nothing.Andy holds a book.Andy pushes against a desk, and it doesn't move.120s
- Q8The _______ of a machine is the amount by which a machine would multiply the force applied to it if no energy were lost due to friction.ideal mechanical advantageactual operating poweractual mechanical advantageideal operating power120s
- Q9A lumberjack is chopping wood with an ax. How does the ax make the lumberjack's job easier?The ax reacts with the wood so that it can be split more easily.The ax is heavy so it can split wood more easily.The ax multiplies the amount of work that is applied by the lumberjack.The ax is heavy so it can split wood more easily.120s
