Which of the following is not an example of work, according to the scientific definition?
A. lifting a suitcase off the floor
B. leaning against a brick wall on the side of a building
C. pulling a sled across the snow
D. pushing a grocery cart
please help as soon as possible
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It is definitely B!
Work is shown by a change in displacement (distance from point A)
Since leaning on a brick wall doesn't move it, there is no work done.
Here's a short explanation on this site:
Hope that helps! I just finished physics this year and know the struggle :)
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Hmm we didn't learn a lot in that class lol but I could try on some other ones :)
How do simple machines make work easier?
A. they change the strength or direction of a force
B. they apply force quickly
C. they decrease the power a available
D. they maintain the distance of a force
Simple machines are to use the same amount of force to move a distance further. "Simple machines give us an advantage by changing the amount,
speed, or direction of forces."
This pdf has good basic desciptions:
...anyways it's A.
what has changed when a gardener uses a lever to lift a rock, instead of using his hand?
A. more force is applied over a longer distance
B. less force is applied over a longer distance
C. more force is applied over a shorter distance
D. less force is applied over a shorter distance
lol sorry i just realized i accidentally asked this in the history section... @OliviaDanielle222