Work

In physics, work is defined as the product of the net force and the displacement through which that force is exerted.
👁 202
statistics
calculate
Questions #: 8
Time: 5 minutes
Pass Score: 80.0%
Style
Mode

_________ is defined as the product of the net force and the displacement through which that force is exerted

Missing
POINTS (1)

Correct Answer

Explanation

What is the equation of work

hint: it is in two simple letters

POINTS (1)

Correct Answer

Explanation

Understanding work by example

Work definition corresponds to our everyday meaning of the word in that when you lift a brick 6 feet from the floor you do as much work as when you lift it 3 feet.  Or suppose you lift 50 bricks to a height of 3 feet.  You do times as much work as lifting one brick that high.

drag and drop the selected option to the right place or type it instead
twice
triple
50
3
POINTS (1)

Correct Answer

Explanation

Holding the bricks, any force exerted?

Work definition corresponds to our everyday meaning of the word in that when you lift a brick 6 feet from the floor you do twice as much work as when you lift it 3 feet. Or suppose you lift 50 bricks to a height of 3 feet. You do 50 times as much work as lifting one brick that high.

But here comes a conclusion that may seem odd.  After you lift a dozen bricks up to your waist, you are told by your boss to hold them there for 5 minutes.  Do you do work in holding them there?  To answer this, we must go back to our definition.  The force you exert is simply the weight of the 50 bricks.

  1. In holding them waist-high, does the force move the bricks through a distance?
  2. Using the formula, calculate the total work done in holding the bricks.

Formula: W = Fd

drag and drop the selected option to the right place or type it instead
no
yes
0
50
POINTS (1)

Correct Answer

Explanation

The unit of work

If force is measured in pounds and distance in feet, the unit of work is the ft.lb, or foot.pound.  In SI units, recall (from frame 5 of Chapter 2) that force is measured in newtons and distance in meters.  The unit of work is the newton.meter, called

POINTS (1)

Correct Answer

Explanation

Is work a vector?

POINTS (1)

Correct Answer

Explanation

How much work is done in lifting a 3-newton cabbage 2 meters?

Missing
POINTS (1)

Correct Answer

Explanation

How much work is done in carrying a 12-newton hammer while holding it at a constant 1.5 meters above the floor?

put your answer in numeric format

Missing
POINTS (1)

Correct Answer

Explanation

Views:
Trials:
Avg score:
0
sin cos tan
sin-1 cos-1 tan-1 π e
xy x3 x2 ex 10x
y√x 3√x √x ln log
( ) 1/x % n!
7 8 9 + MS
4 5 6 – M+
1 2 3 × M-
0 . EXP ÷ MR
± RND C = MC

Document Actions