Power and Work Quiz

How much power does it take to do 450 J of work in 5 sec?

• 90 W

• 100 W

• 80 W

• 75 W

How much power is used when a force of 33N pulls a wagon 13 meters in 10 seconds?

• 42.9 W

• 43 W

• 42 W

• 44 W

Tags

NGSS.MS-PS3-5

Jiggly Puff uses a force of 50 N to push a Squirtle 10 m in 3 seconds. How much power did it use?

• 166.7 W

• 150 W

• 160 W

• 170 W

Tags

NGSS.MS-PS2-2

T F Machines make work easier by creating energy and transferring it from one location to another.

• True

• False

• Sometimes true

• Not enough information

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS3-5

If a machine has an input of 10 N and it did this over 5 m. The output F is 25N, what is the output distance?

• 2 m

• 1 m

• 2.5 m

• 3 m

A force of 10N is applied to the effort arm of a lever. The load arm is ½ the length of the effort arm, what will be the F_output?

• 20 N

• 15 N

• 25 N

• 30 N

Tags

NGSS.MS-PS2-2

An automobile gasoline engine is able to do 225 J of useful work with each stroke of its pistons. If the engine has an efficiency of 29%, what is the amount of work that must be done on the pistons in the engine?

• 775.9 J

• 775 J

• 780 J

• 770 J

Tags

NGSS.MS-PS2-2

The resistance of water to an oar in a rowboat limits the oar’s efficiency to 45%. If the rower does 145 J of work on the oar with each stroke, how much useful work is done by the oar?

• 65.25 J

• 72.5 J

• 145 J

• 100 J

Tags

NGSS.MS-PS3-5

How efficient is a pulley system if an operator has to pull 4.0 m of rope to raise a 250 N pail of water a distance of 2.0 m? The operator is pulling with a force of 150 N.

• 33.3%

• 50%

• 75%

• 100%

Tags

NGSS.MS-PS2-1

NGSS.MS-PS3-4

A machine has a mechanical advantage of 10, and you are trying to lift a 100N mass, how much force do you need to exert on the machine?

• 10 N

• 100 N

• 1 N

• 50 N