Name Date
Period
Workbook Activity
22
Chapter 5, Lesson 1
What Is Work?
Directions On the line, write the word or words that best complete the sentence.
1. When work is done, an object changes its
2. Work is done when a force moves an object in the
of the force that is applied.
3. To measure work, you must
through which it acts.
4. Work is measured in newton-meters, or
the force by the distance
5. The formula for measuring work is
Directions Use the formula work = force X distance to find each answer. Give the answer in joules.
6. Julie rolled a 2-kg ball down a ramp 10 meters long.
(Romamber 1 Iro 98 newtons.) How much work was done?

Write the complete balanced equation for the reaction between lead (iv) oxide (pbo2) and water (h2o).

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

What effect might melting sea ice have for people who live in coastal areas?