Science help? Physics? Chemistry?
I’M HAVING A HARD TIME WITH THE FOLLOWING!! PLEASE HELP!
Can someone explain how the scientific defenition of work is different from the everyday meaning?
Can someone give me an example of a situation in which a force is applied but no work is done?
Which of the following situations is work being done?
A)A person shovels snow off a sidewalk.
B)A worker lifits bricks, one at a time, from the ground to the back of a truck.
C)A roofer’s assistant carries a bundle of shingles across a construction site.
Can someone describe to me the circumstances for which the output work would equal the input work in a machine?
How does lubricating a machine effect the output force exerted by the machine?
I’m having a hard time calculating the mechanical advantage of a hammer if the input force is 125 N and the output force is 2,000 N.
-THANKS IN ADVANCE!!!!
Tagged with: Bundle Of Shingles • Shovels • Sidewalk
Filed under: Physics
Like this post? Subscribe to my RSS feed and get loads more!
herts roof installation
make my brain hurt
herts flat roof systems
Scientific: Work = Force* Distance
Everyday: I sit in a cubicle and work all day but my vector movement sum is zero.
Force is applied by a column holding up a building but (hopefully) the building isn’t moving, so no work is done.
A) yes: the snow is moved by the person (as long as the person lets the snow fall off the shovel of the sidewalk and doesn’t set the shovel down. to get rid of the snow… net work = 0)
B) yes: the bricks are moved from one place to the next. the bricks are being placed higher than their original position which requires net energy
C) yes: force is applied in walking from point a to point B.
you’re on your own… thermodynamics must not apply
lubrication reduces friction. friction is basically energy lost to heat
2000 / 125 = 16, right?