In order to do work, the force vector must be

question 1 options:

in the same direction as the displacement vector and the motion.

in the same direction as the acceleration vector.

in a different direction than the displacement vector.

in a different direction than the acceleration vector.

question 2 (1 point)
in which of the following cases is work being done on an object?

question 2 options:

suspending a heavy weight with a strong chain

pushing against a locked door

carrying a box down a corridor

pulling a trailer up a hill

question 3 (1 point)
which situation is an example of not doing work?

question 3 options:

carrying a box

throwing a baseball

running up stairs

lifting a couch

question 4 (1 point)
work is measured in

question 4 options:

joules

meters

newtons

watts

question 5 (1 point)
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?

question 5 options:

when more work was done, the couch was moved less.

when more work was done, the couch was moved further.

when more work was done, the couch wasn't moved at all.

when more work was done, the couch was moved the same distance.

question 6 (1 point)
a weight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd

question 6 options:

30 joules

320 joules

3200 joules

3000 joules

question 7 (1 point)
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?

question 7 options:

alex did - more tension means more force - more force means more work was done

you did - less tension means less force - less force means more work was done

question 8 (1 point)
doing work at a faster rate creates power.

question 8 options:

more

less

equal

zero

question 9 (1 point)
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?

question 9 options:

angel has more power than anthony.

angel does more work than anthony.

anthony does more work than angel.

anthony has more power than angel.

question 10 (1 point)
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

question 10 options:

20,500,000 watts

82 watts

0.0122 watts

41,500 watts

question 11 (1 point)
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

question 11 options:

249 watts

25 watts

2075 watts

27.7 watts