Physics Quiz 14 - Work

What is work?

• Work = Force X Displacement (w = fd)

• Work = Force / Displacement (w = f/d)

• Work = Force X Distance (w = fD)

Work only occurs if an object is displaced (if its final position is different than its initial position)

• True

• False

Which of the following are examples of work being done?

• A teacher pushes against a wall, but it doesn't budge

• An apple falls from a bookshelf to the ground

• A weight lifter lifts a barbell above his head

• A plane flies through the sky

If a weight lifter lifts a 407 lb weight off the ground, presses it above his head 10 times, and returns it to the ground. How much work has she done?

• None! The object has zero displacement.

• 4070 Joules

• 417 Joules

• 40.7 Joules

What unit is used to measure work?

• Joules

• Newtons

• Teslas

• Pounds