Work, Energy and Power

Work, Energy and Power

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Multiple Choice

A car skids to a stop along a level highway. Is this an example of positive, negative or zero being done on the car?

 Is this an example of positive, negative, or zero work being done on the ca

• Positive

• Negative

• Zero

Multiple Choice

A softball player slows to a stop while diving into third base. Is this an example of positive, negative or zero being done on the player?

 Is this an example of positive, negative, or zero work being done on the player?

• Positive

• Negative

• Zero

Multiple Choice

The lineman push on the weighted sled to accelerate it across the football field. Is this an example of positive, negative or zero being done on the sled?

• Positive

• Negative

• Zero

Multiple Choice

Aaron pulls on the handle of the locked classroom door but fails to open it. Is this an example of positive, negative or zero being done on the wall?

• Positive

• Negative

• Zero

Open Ended

Define power in your own words.

Multiple Choice

What are the units for power?

• Watts

• Joules

• Newtons

• Kilograms

Multiple Choice

What is the formula for power?

• Power = Work x Time

• Power = Force x Distance

• Power = Work/Time

• Power = Force/Time

Open Ended

Explain how a 45 and 60 watt bulb differ in terms of energy output.

Work

A force applied to an object over a set distance

Multiple Select

Two factors that determine work are...

• Force

• Mass

• Velocity

• Distance

Multiple Choice

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

• 15 J
• 45 J
• 0 J
• 5 J

Multiple Choice

Is this an example of work? 
A waiter carries a tray full of meals above his head by one arm straight across the room at constant speed. 

• True
• False

Power

Power is the rate at which something does work over a period of time

Multiple Choice

What is the difference between calculating power and work?

• Power takes into account the time it takes to complete a task
• Work takes into account the time it takes to complete a task
• Power is force/area
• Work is force/area

Multiple Choice

Work divided by time equals...

• energy
• power

Work and Power

Multiple Choice

A force of 4.6 N moves a 2.7 kg box a distance of 3.3 m in 6.8 s. How much power is exerted?

• 2.23 W

• 6.03 W

• 17.4 W

• 278.7 W