Physics Review - Work and Energy

Work =

• force times distance

• force divided by distance

• one half times velocity squared

• gravity times friction

A force of 550 N causes a statue to move 2 meters. How much work was done on the statue?

W = Fd

• 1100 J

• 275 J

• 600 J

• 150 J

Tags

NGSS.HS-PS3-2

Hank applies a 35 N force to his lawnmower in order to push it 50 meters. How much work did Hank perform?

• 1750 J

• 2150 J

• 85 J

• 975 J

Tags

NGSS.MS-PS3-5

A weightlifter exerts a 2000 N force to lift a bar 0.5 m. How much work was done by the weightlifter?

• 1000 J

• 100 J

• 2500 J

• 40 J

Tags

NGSS.MS-PS3-5

PE_grav = mass x gravity x ________

• velocity

• height

• acceleration

• friction

PE_grav = ______ x gravity x height

• velocity

• mass

• normal force

• friction

Tags

NGSS.MS-PS2-4

How much potential energy is contained in a 20 kg flowerpot resting on a balcony 80 meters above the ground?

PE_grav = mgh

• 1860 J

• 15,680 J

• 320 J

• 7,670 J

Tags

NGSS.MS-PS3-2

How much potential energy is contained in a 20 kg flowerpot resting on a balcony 40 meters above the ground?

PE_grav = mgh

• 1860 J

• 7840 J

• 12,320 J

• 670 J

Tags

NGSS.MS-PS3-2

A 1 kg frisbee lodged in a tree branch contains 490 J of potential energy. How high above the ground is the frisbee?

PE_grav = mgh

• 18 m

• 50 m

• 75 m

• 100 m

Tags

NGSS.MS-PS3-2

A 25 kg microwave rests on a counter top 1.5 m above the ground. How much potential energy does the microwave contain?

PE_grav = mgh

• 180.0 J

• 367.5 J

• 255.5 J

• 240.6 J

Tags

NGSS.MS-PS3-2