AP Physics Work and Energy

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

What unit do we use for measuring power?

• Watts 

• Joules 

• Newtons 

• ft/lbs

Which are correct units for work?

• N x s

• N x m

• J/s

• W

Which are correct equivalent units for power?

• N x s

• N x m

• J

• J/s

Which principle states that whenever work is done, energy changes form?

• Law of Conservation of Energy

• Work-Energy Theorem

• Newton's Fourth Law

• Efficiency

Mike and Ian move 50 m on a snow lift which uses 750 N of force to move them in 75 seconds. Calculate the power of the lift.

• 750 W

• 500 W

• 7500 W

• 2812500 W

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Mike and Peter are climbing to the top. Both take the same time, do the same route, but Mike has a mass of 25 kg while Peter has a mass of 30 kg. (He is a bit taller). Which penguin does the most work and why.

• Mike as shorter people have shorter legs and does more work.

• Peter as he does more work over the same time than Mike because he has a bigger weight force

• Mike and Peter do the same amount of work as they do the same route in the same time.

• Peter as he does the same amount of work but in a smaller amount of time.

Tags

NGSS.MS-PS2-4

Winnie and Eeyore have the same mass and have just finished climbing the same tree, but Eeyore was 4 seconds faster then Winnie. Who used the most power?

• Winnie as he took the longer time and did the same amount of work as Eeyore

• Winnie as he is shorter and could grip more as so did more work overall

• Eeyore as he did the same amount of work as Winnie but in a shorter time.

• Eeyore as he did more work than Winnie but in a shorter time

Tags

NGSS.MS-PS3-5

How far does a car that pulled with a 5,000 N force go if 18,000 J of work is done on it?

• 3.8 m

• 3.7 m

• 3.2 m

• 3.6 m

Tags

NGSS.MS-PS3-5

What is the weight of an object if 75 J of work is done to lift it uniformly 6.0 m

• 13 N

• 450 N

• 1.3 kg

• 130 kg

Tags

NGSS.HS-PS3-1

NGSS.HS-PS2-4