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Chapter 5 Test Prep Game

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**A 50 kg skater slows down from 2. 0 m/s to 1. 0 m/s**

A 50 kg skater slows down from 2.0 m/s to 1.0 m/s. What is his change in Kinetic Energy? 25 J 100 J 75 J 150 J

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How much work is required for a 60 kg woman to walk up a 2 m ramp to a height of 1 m above the ground, carrying a 40 kg box? 980 J 588 J 1960 J 1176 J

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A stationary 4-N soccer ball is kicked with a force of 5 N for a distance of 0.1 m before it rolls an additional 10 m. How much kinetic energy does the ball gain from the kick? 9 J 0.5 J 0.9 J 50 J

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**In which of the following cases is no work done?**

A weightlifter lifts a barbell. A weightlifter holds a barbell overhead. A weightlifter slowly lowers a barbell. A weightlifter drops a barbell and the barbell falls to the ground.

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**You lift a 4. 5-kg box from the floor and put it on a shelf 1**

You lift a 4.5-kg box from the floor and put it on a shelf 1.5 m above the ground. How much energy did you use? 9.0 J 49 J 11 J 66 J

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Which is the equation used to calculate the work done on an object by a force at an angle to the displacement? W = Fd W = Fdcosθ W = Fdsinθ W = mgsin θ

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**A Joule is equivalent to:**

N/m Nm Kgm/s2

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**Energy that is due to motion of an object is:**

Potential Energy Gravitational Potential Energy Kinetic Energy Elastic Potential Energy

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**What do you divide work by to calculate power?**

Time Distance Force Weight

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Lifting a stone block 146 m to the top of the Great Pyramid required 146,000 J of work. How much work was done to lift it halfway to the top? 36,500 J 146,000 J 73,000 J 292,000 J

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**A motor applies a 5000-N force to raise an elevator 10 stories**

A motor applies a 5000-N force to raise an elevator 10 stories. If each story is 4 m tall, how much work does the elevator do? 200,000 J 50,000 J 20,000 J 5,000 J

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**Calculate the power, in watts, needed to mow a lawn in 50 minutes if the work required is 500,000 J.**

2,500 kW 5,000 W 167 W

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**Which of the following is transferred when work is done?**

Distance Energy Force Power

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**Which does more work on an object?**

Pushing a 50-N object a distance of 2 m Pushing a 120-N object a distance of 7 m Pushing a 150-N object a distance of 5 m Pushing a 300-N object a distance of 1 m

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**How does the Kinetic Energy of an object change if the object’s speed doubles?**

Decreases by half the original value Quadruples Doubles Decreases by ¼ of the original value

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**Which of the following does not affect potential energy?**

An object’s mass An object’s height An object’s speed Free-fall acceleration

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**Which of the following is true of the conservation of energy in a closed system?**

Kinetic Energy is always conserved. Potential Energy is always conserved. Mechanical Energy is always conserved. Total Energy is always conserved.

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**Which of the following is not a form of Mechanical Energy?**

Kinetic Energy Chemical Energy Gravitational Potential Energy Elastic Potential Energy

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**A 0. 07 kg egg suspended above the ground has 2**

A 0.07 kg egg suspended above the ground has 2.0 J of potential energy. If it is dropped, what is the velocity of the egg right before impact? 28.6 m/s 2.9 m/s 0.76 m/s 7.6 m/s

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**Which of the following is the rate at which energy is transferred?**

Power Work Mechanical Energy Kinetic Energy

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**How much work can a motor with a power output of 25 W do in 1 second?**

1/25 J 1 J 25 J 25 W

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**A man pushes a 10-kg box with a 33 N force a velocity of 2 m/s**

A man pushes a 10-kg box with a 33 N force a velocity of 2 m/s. What is the power? 3.3 W 66 W 330 W 16.7 W

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**How much Kinetic Energy does an 82-kg hockey player skating 10 m/s have?**

820 J 8200J 410 J 4100 J

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**A car transported by ship is raised 7**

A car transported by ship is raised 7.3 m above the dock giving it a Potential Energy of 66,375 J. What is the car’s mass? 9092 kg 484,537 kg 928 kg 49443 kg

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Through what height could a 1000-N object be lifted to expend the same amount of power of a 60-W bulb for 6 hours? 650 m 1300 m 430 m 360 m

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**4. 0 J of work is performed to stretch a spring with k=2500 N/m**

4.0 J of work is performed to stretch a spring with k=2500 N/m. How much is the spring stretched? 5.7 cm 0.3 cm 5.7 m 3.2 m

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**Which of the following is not an example of an exchange between Kinetic and Potential Energy?**

A ball being thrown in the air Water from a drinking fountain Flipping a pancake Running around an oval track

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How large a force is needed to accelerate a 1600 kg car from rest to a speed of 25 m/s in a distance of 200 m? 1600 N 200 N 2500 N 400 N

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What is the power generated by a hydroelectric power plant with a 8900 kg/s water source that involves a 30-m drop? 7.2 kW 2.6 MW 2.6 kW 7.2 MW

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In a bicep curl, a weightlifter lifts a mass of 15 kg a vertical distance of 66 cm. How much work is done on the mass? 990 J 97 J 101 J 43 J

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Calculating Work and Power

Calculating Work and Power

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