A worker pushing a 35.0-kg wooden crate at a constant speed for 11.7 m along a w

Question

A worker pushing a 35.0-kg wooden crate at a constant speed for 11.7 m along a wood floor does 410 J of work by applying a constant horizontal force of magnitude F on the crate.

(a) Determine the value of F: ___?___ N

(b) If the worker now applies a force greater than F, describe the subsequent motion of the crate:

-The crate would slow and come to rest.

-The crate's speed would increase with time.

-The crate's speed would remain constant over time.

(c) Describe what would happen to the crate if the applied force is less than F:

-The crate would slow and come to rest.

-The crate's speed would increase with time.

-The crate's speed would remain constant over time.

Explanation / Answer

a) W = Fd

410 = F x 11.7 = 35.04 N

b) at this force , crate is moving with constant speed that means some opposite force is balancing this force. if oorce is greater than balancing will be lesse now, so crate will aquire a acceleration.

- crate's speed will increase with time.

c) if less than, balancing force is more. negative acceleration.

- crate would slow down and come to rest.

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