Mechanical Energy and Work

An instance where a force is appiled in the opposite direction of a displacement is called __________________ work.

• negative

• false

• faux

• opposite

If a ball tossed into the air has a maximum gravitational potential energy of 5.75 joules, what is its maximum kinetic energy in the same toss?

• 5.75 joules

• 11.14 joules

• 2.88 joules

• 7.93 joules

Tags

NGSS.HS-PS3-1

What is the mechanical energy of the roller coaster car?

• 100 joules

• 50 joules

• 2500 joules

• 1 joule

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

How much work is being done with 200 N of force to the right on object that moves 426 meters to the right? (assume the force and displacement are in the same direction)

• 85,200 J

• 45,620 J

• 90,480 J

• 62,329 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

How do we calculate work?

• W = F * d

• w = f * D

• W = F * D

• w = f * d

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

If 150 Joules of work is needed to move a box 10 meters, what force was used? 

• 1500 N

• 15 N

• 1.5 N

• 150 N

Tags

NGSS.HS-PS2-1

You push against the back of your friends car that is stuck. You push and be become very tired, but the car does not move. Did you do work?

• Yes, work was done

• No, work wasn't done

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

If 68 W of power is produced in 18 seconds, how much work is done?

• 1,224 J

• 0.264 J

• 3.77 J

• 12.24 J