Work, Energy, and Power

Work, Energy, Power, & Power Systems Review

Multiple Choice

The unit of work is

• watt

• hertz

• joule

• pascal

Multiple Select

Which of the following definitions is correct.

• Work is energy stored in place

• Power is the rate of work done

• Fission is when atoms merge together

• Generators convert mechanical energy into electrical energy

Fill in the Blanks

The Work-Energy Theorem states that the Work done on something is equal to the change in

energy

Multiple Choice

Which of these items is not part of the law of conservation of energy?

• energy cannot be created

• energy cannot be destroyed

• energy can be transferred between forms

• energy is destroyed by friction

Multiple Choice

What is g on Earth?

• 9.8 m/s/s
• 9.8 m/s
• 42 m*s
• 42 m/s/s

Multiple Choice

What is the formula for Kinetic Energy?

• PE = m*g*h
• KE = 1/2m*v2
• W = F*d
• P = W/t

Multiple Choice

What is the formula for Gravitational Potential Energy?

• PE = m*g*h
• KE = 1/2m*v2
• W = F*d
• P = W/t

Multiple Choice

What is being transferred as you do work?

• Energy

• Heat

• Power

• Gravitational Potential Energy

Multiple Choice

How much work is being done with 200 N of force over 426 meters?

• 85,200 J
• 45,620 J
• 90,480 J
• 62,329 J

Multiple Choice

A weightlifter holds a 100 kg barbell above her head. Is work done?

• Yes because there is a force applied to the barbell and the force causes a displacement of the barbell.

• Yes because there is an upward force applied to the barbell and the barbell moves vertically.

• No because no displacement occurred.

• No because there is no force applied.

Multiple Choice

A weightlifter holds a 100 kg barbell above her head. Is work done?

• Yes because there is a force applied to the barbell and the force causes a displacement of the barbell.

• Yes because there is an upward force applied to the barbell and the barbell moves vertically.

• No because no displacement occurred.

• No because there is no force applied.

Multiple Choice

How do you calculate power?

• P = W/t

• P = E/t

• P = w * t

• P = bbq/chicken

Multiple Select

Nuclear Energy is made through 2 processes called...

• Fission

• Fusion

• Fracking

• Heating

Multiple Select

What are the main fossil fuels?

• Coal

• Oil

• Natural Gas

• Nuclear Energy

Multiple Choice

What is a disadvantage of wind power?

• We have too many rainy days in US
• It is not always windy in some places
• Companies charge too much to make the wind blow
• The sun is not always out

Multiple Choice

All of the following are considered renewable energy sources EXCEPT –

• Wind

• Coal

• Biomass

• Solar

Multiple Choice

Heat transferred from beneath the surface of Earth and used to produce energy for human use is...

• Hydropower
• Wind Energy
• Geothermal Energy
• Solar Energy

Multiple Choice

The house illustrated here uses panels on the roof to collect a natural resource and convert it into electricity that can be used.
Which alternative energy source does this house use?

• Water
• Wind
• Solar
• Geothermal

Multiple Choice

Why is solar energy considered renewable energy?

• It's cheaper than fossil fuels

• The sun's energy would not run out for billions of years

• Solar energy recharges batteries

• All of them

Multiple Choice

What percent energy is wasted by a machine if the energy input is 262 J and the energy output is 131 J?

• 5%

• 50%

• 100 J