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Q 1/9
Score 0
Energy enables an object to do work. Work is done when
120
a 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.
Q 2/9
Score 0
What is mechanical advantage?
120
a characteristic that compound machines have and simple machines lack
a measure of how much a machine multiplies the force applied to it
a property of some machines that allows them to do work with no input force
a theory stating that machines are better at performing tasks than humans
9 questions
Q.
Energy enables an object to do work. Work is done when
1
120 sec
Q.
What is mechanical advantage?
2
120 sec
Q.
Rubia 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?
3
120 sec
Q.
Adam 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?
4
120 sec
Q.
Jeffrey 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?
5
120 sec
Q.
Which of the following is an example of work being done on an object?
6
120 sec
Q.
Andy'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?
7
120 sec
Q.
The _______ 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.
8
120 sec
Q.
A lumberjack is chopping wood with an ax. How does the ax make the lumberjack's job easier?
