Exploring Work and Power Concepts

What is required for work to be done on an object?

• Force and motion in the same direction

• Force and motion in opposite directions

• Only force

• Only motion

If a person pushes a wall with a lot of force but the wall does not move, how much work is done?

• Infinite work

• No work

• A lot of work

• Some work

What is the unit of measurement for work?

• Watts

• Meters

• Joules

• Newtons

How much work is done if a person with a mass of 100 kg does a pull-up for a distance of 0.5 meters?

• 490 Joules

• 500 Joules

• 510 Joules

• 520 Joules

What is the definition of power in terms of work?

• The rate of doing work

• The energy required to do work

• The amount of work done

• The force applied over a distance

If it takes 50 joules of work to lift a box in 20 seconds, what is the power required?

• 2.0 Watts

• 2.5 Watts

• 3.0 Watts

• 3.5 Watts

What is the relationship between work and energy?

• Work and energy are unrelated

• Energy is always greater than work

• Work is always greater than energy

• Work is equal to the change in energy

Tags

NGSS.MS-PS3-5

A skier with a mass of 82 kg travels up a 19-degree incline and comes to rest. What is the average force of friction if the skier glides 11.3 meters up the slope?

• 200 N

• 225 N

• 250 N

• 275 N

Tags

NGSS.MS-PS2-2

How long does it take for a motor with a power rating of 1.81 x 10^4 watts to raise a 1300 kg roller coaster to a height of 39 meters?

• 25 seconds

• 28 seconds

• 32 seconds

• 30 seconds

Tags

NGSS.MS-PS3-4

If a roller coaster rolls over point A at 2 m/s and reaches point B without friction, how fast is it going at point B?

• 17 m/s

• 15 m/s

• 14 m/s

• 16 m/s

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5