# Force, Work, And Power: Question Preview (ID: 12640)

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**How much work is done when a very large force is applied to an object but does not move the object?**

a) none

b) a lot

c) a little

d) The exact amount of work and the weight of the object must be known to figure this out.

**Which of these is the unit of measure for work?**

a) watts

b) joules

c) pounds

d) newtons

**What is the correct formula for work?**

a) Work=force/time

b) Work=force*distance

c) Work= force/distance

d) Work=mass * acceleration

**Which of the following is NOT an example of work?**

a) a windmill turning in the wind

b) a person sliding a box across the floor

c) a metal bar bracing a leaning brick wall

d) an air bag deploying in an automobile wrech

**Two weight lifters (Herb and Foley) wonder which one is doing the most work. Which statement is true?**

a) Herb lifting 60 kg 1 meter does more work than Foley lifting 35 kg 2 meters.

b) Herb lifting 50 kg 1.5 meters does more work than Foley lifting 55 kg 1 meter.

c) Herb lifting 70 kg 0.5 meters does more work than Foley lifting 30 kg 1.5 meter.

d) Herb lifting 80 kg 2 meters does more work than Foley lifting 25 kg 1 meter 7 times.

**What is the work done on a 34-N weight if it is lifted up 1 km?**

a) 17 J

b) 34 J

c) 0.034 J

d) 34,000 J

**A sailboat weighing 1,960 N moves at 3m/s for 10 minutes. What is the value for the work of the sails.**

a) 19,600 J

b) 58,800 J

c) 1,176,000 J

d) 3,528,000 J

**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) 0.5 J

b) 19.6 J

c) 1.225 J

d) 192.08

**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) 0.36 J

b) 0.36 N

c) 0.60 N

d) 1.00 J

**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) 250,000 N

d) 3,000,000 J

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