Force, Work, and Power

Johnny wants to know how much time it will take him to 10 joules of work (moving around live sharks) with 34 watts. He thinks the answer is 0.29 seconds. Is he right?

• Yes

• No

Emmet needs to wreck a building with a wrecking ball. The ball accelerates at 26 m/s/s, arriving at its 30 meters away destination in 34 seconds, and has a mass of 3,000 kg.  How much work is this ball doing?

• 2,340,000 Joules

• 44,225,463 newtons

• 44,325,473 newtons

• 44,235,464 newtons

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-5

Work is measured in...

Jack is calculating mechanical advantage. He puts in 100% of his force to his homework (45 Newtons) but for some reason only 15 Newtons come out. What is the MA?

• 3

• 1/3

• 3.1415926535...

• 346

It took 500 Newtons of force to push a car four meters. How much work was done?

• 2000 J

• 125 J

• 0.008 J

• 500 J

Tags

NGSS.MS-PS2-2

____ is being done when a force is exerted on a wagon while it is being pulled up a hill.

• Power

• Force

• Work

Diagram shows a student lifting a weight of 500 g 0.5 m vertically from the floor. If the force recorded on the spring balance is 5 N, calculate the work done by the student.

• 2500 J

• 250 J

• 2.5 J

• 0 J

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-5

A kid throws a ball with a force of 70N over 1.1 meters. How much work did he do?

• 77 joules

• 70 joules

• 7.7 joules

• 11 joules

Tags

NGSS.MS-PS2-2

Which of the following is a true statement about work?

• It measures how quickly an object accelerates 

• It measures how much effort is applied over a certain distance

• It measures the change in an object's rate of speed

• It measures how much time it takes to move a massive object

Tags

NGSS.MS-PS3-5

A boy pushed a 20 kg box over a distance of 2 m. Calculate the work done. (Assume gravitational force acting on an object of mass 1 kg = 10 N)

• 0 J

• 4 J

• 40 J

• 400 J

Tags

NGSS.MS-PS2-2