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Unit 10 Review
Quiz by Pamela Sosna
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27 questions
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- Q1What is a machine that is made of two simple machines called?pulleycompound machinesimple machinelever30s
- Q2What is it called when a force causes an object to move in the same direction that the force is being applied?forcepowerenergywork30s
- Q3Which of the following prevents machines from being 100% efficient?poweroutput forcefrictioninput force30s
- Q4If you closely examine a screw, you will see that the threads on it form a long _________________ wrapped around a cylinder.inclined planewedgepulleywheel and axle30s
- Q5A device that makes work easier by changing the size or direction of force is called what?wattpowermachineforce30s
- Q6The rate at which energy/work is transformed is called what?jouleworkenergypower30s
- Q7What does a fixed pulley change?the timing of the forcethe direction of the forcethe speed of the forcethe size of the force30s
- Q8A lever and fulcrum are used to lift a fallen tree, which has a weight of 480 N. If the lever has a mechanical advantage of 5.5, what is the input force that will begin lifting the tree off the ground?40.7 N2640 N87.3 N5.5 N120s
- Q9Chris and Jane are lifting boxes to put them on shelves. Chris does 200 J of work in 5 min, and Jane does 200 J of work in 4 min. What is the difference between the two jobs?the output forcethe workthe input forcethe power60s
- Q10In which situation is a person doing work on an object?A student exerts 1N of force on their locker that won’t open.A student picks up a book that weighs 10 N.A student holds a backpack 1 m off the floor.A student walks forward while wearing a backpack that weighs 15 N60s
- Q11Greg applies a force of 100 N to move a box 5 meters. How much work did he do?500 J500 N5 J100 J60s
- Q12What is the work that you do on a machine called?work inputleverpowerwork output30s
- Q13The greater the ratio of an inclined plane’s length to its height, the greater themechanical efficiencymechanical advantagepowerwork30s
- Q14How much work is done lifting a 5 kg ball from a height of 2 m to a height of 6 m? (Use 9.8 m/s2 for the acceleration of gravity.)98 J392 J196 J294 J120s
- Q15A construction worker is lifting a load of bricks onto a truck and he does 200 J of work in 40 s. What is his power output?50 W50 J5 J5 W120s