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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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Energy and Work. Energy Energy is the ability to change or cause change. If something has no energy, there can be no change.

Energy and Work. Energy Energy is the ability to change or cause change. If something has no energy, there can be no change.

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