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November 27, 2014

November 27, 2014

Posted by **steve** on Wednesday, January 26, 2011 at 11:27pm.

how much force is needed to move a 10 pound block 10 feet in 8 seconds>

- physics -
**drwls**, Thursday, January 27, 2011 at 1:37amAssuming there is no friction, proceed as follows.

The mass of the block is

M = W/g = 10/32.2 = 0.3106 slugs

Mass must be measured in slugs if you want the force in pounds, using Newton's second law.

The final velocity will have to be

2*10 ft/8 s = 2.5 ft/s to move 10 feet in 8 seconds. (The average velocity is half that, 1.25 ft/s)

The acceleration is

a = (2.5 ft/s)/8s = 0.3125 ft/s^2

Now use F = M a, with the mass M in slugs.

F = 0.097 pounds force

Look at it this way: You are accelerating the mass at about 1/100 g, so you need a force equal to only about 1/100 of the weight.

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