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Force, Work, And Power
Test Description: Review questions!
Instructions: Answer all questions to get your test result.
1) How much work is done when a very large force is applied to an object but does not move the object?
A
none
B
The exact amount of work and the weight of the object must be known to figure this out.
C
a lot
D
a little
2) Which of these is the unit of measure for work?
A
pounds
B
watts
C
joules
D
newtons
3) What is the correct formula for work?
A
Work=force*distance
B
Work=force/time
C
Work= force/distance
D
Work=mass * acceleration
4) Which of the following is NOT an example of work?
A
a metal bar bracing a leaning brick wall
B
a person sliding a box across the floor
C
an air bag deploying in an automobile wrech
D
a windmill turning in the wind
5) Two weight lifters (Herb and Foley) wonder which one is doing the most work. Which statement is true?
A
Herb lifting 70 kg 0.5 meters does more work than Foley lifting 30 kg 1.5 meter.
B
Herb lifting 60 kg 1 meter does more work than Foley lifting 35 kg 2 meters.
C
Herb lifting 80 kg 2 meters does more work than Foley lifting 25 kg 1 meter 7 times.
D
Herb lifting 50 kg 1.5 meters does more work than Foley lifting 55 kg 1 meter.
6) What is the work done on a 34-N weight if it is lifted up 1 km?
A
34 J
B
0.034 J
C
34,000 J
D
17 J
7) A sailboat weighing 1,960 N moves at 3m/s for 10 minutes. What is the value for the work of the sails.
A
3,528,000 J
B
58,800 J
C
1,176,000 J
D
19,600 J
8) A model rocket weighing 4.9 N launches from a pad. How much work does the little rocket engine do in the first 4 meters?
A
1.225 J
B
0.5 J
C
19.6 J
D
192.08
9) A rod on a compressed spring exerts 12 N of force on a 0.05-kg steel ball. The rod pushes the ball 0.03 m. How much work does the spring do on the ball?
A
0.60 N
B
0.36 N
C
1.00 J
D
0.36 J
10) A 100 N force is applied to a plow by the horse pulling the plow. How much work does it take for the horse to pull the plow 100 meters in 5 minutes?
A
10,000 J
B
10,000 N
C
3,000,000 J
D
250,000 N
*select an answer for all questions
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