Question 1
In order to do work, the force vector must be
in the same direction as the displacement vector and the motion.
Question 2
In which of the following cases is work being done on an object?
Pulling a trailer up a hill
Question 3
Which situation is an example of NOT doing work?
carrying a box
Question 4
Work is measured in
Joules
Question 5
To find the work done, the force exerted and distance moved are multiplied. A couch is moved twice before you are happy with its placement. The same force was used to move the couch both times. If more work is done the first time it is moved, what do you know about the distance it was moved?
When more work was done, the couch was moved further.
Question 6
A weight lifter raises a 1600 N barbell to a height of 2.0 meters. How much work was done? W = Fd
3200 Joules
Question 7
You and a friend (Alex) are at a a tree-top adventure park .. . . part of the course requires you to climb up a rope. You both climb the same rope in the same amount of time. However, the tension in the rope is greater
when Alex climbs. Who did the most work?
Alex did - more tension means more force - more force means more work was done
Question 8
Doing work at a faster rate creates power.
more
Question 9
In one challenge on the Titan Games, competitors have to lift 200 pounds up a long ramp. Angel is able to move the weight in 42 seconds. Anthony gets it done in only 38 seconds. Which statement is true?
Anthony has more power than Angel.
Question 10
A mountain climber exerts 41,000 J of work to climb a cliff. How much power does the climber need if she wants to finish in only 500 seconds? Power = Work / time
82 Watts
Question 11
Your family is moving to a new apartment. While lifting a box 83 Joules of work is done to put the box on a truck, you exert an upward force of 75 N for 3 s. How much power is required to do this? (Hint: You only need two of the 3 numbers given!) Power = Work / time
27.7 Watts
<em>*100% CORRECT ANSWERS</em>
