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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: http://www.physicsclassroom.com/class/energy/Lesson-1/Definition-and-Mathematics-of-Work Hope that helps! I just finished physics this year and know the struggle :)
Thanks, could you help with some other problems?
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: http://camillasenior.homestead.com/review_simple_machines.pdf ...anyways it's A.
haha thanks, 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
http://openstudy.com/study#/updates/536bf17fe4b0e4d5545d11ba Less force is applied over a longer distance. So B. haha someone else asked this question on here already. Hope I helped a little I'm sorry I have to go but I can do some others later if you want :)