Physics Review Work and Energy

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 Blank

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