Energy Is Work!: Question Preview (ID: 7920)


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For work to be done on an object, such as pushing a child on a swing,
a) some force need only be applied to the object b) the object must move a distance equal to the amount of force applied to it c) the object must move, whether or not a force is applied d) the object must move some distance as a result of a force
When work is being done as a shopping cart is moved through the store, this is also evidence of
a) magnetism b) conservation c) energy d) heat transfer
When we see work being done, we see evidence of
a) speed b) simple machines c) transformation d) energy
For a machine to actually do work on an object, the object must
a) move some distance as a result of a force b) move, whether or not a force is applied to it c) have a force applied to it d) move a distance equal to the amount of force applied to it
Work is being done on an object in all of the following situations EXCEPT
a) A student pulls a desk to the other side of the room b) A boy pushes his bicycle down the driveway c) The children move their mats to the center of the room d) A girl holds the grocery bag for her mother
When force is __________ motion, no work is done.
a) going in the same direction of b) going in a downward direction from c) going in a sideways direction from d) going in the opposite direction of
The SI unit that is used for measuring force on a spring scale is the
a) gram b) liter c) newton d) meter
All of the following support the fact that work is being done on an object EXCEPT
a) sliding a box across the floor b) pushing a lawnmower across the yard c) lifting a stereo into the back of a truck d) holding a set of weights up over the head
Allen pushes hard against a heavy box until he is exhausted. What is the reason science says that he has done no work?
a) No energy has been used b) The force on the box is too small c) There has been no force applied d) The box has not moved
What two factors are required for work to be done?
a) Energy must be transfered; force must be used b) Force must be applied; the object must move c) Energy must be applied; a tool must be used d) Force must be applied; the object must be held
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