F=W+P=ma_e
Rewriting yields P=ma_e-mg=m(a_e- g).
If your mass is 60 kg and the elevator is accelerating upwards at 1 m/s², your apparent weight is
P=60 kg (+1 m/s²-(-9.8 m/s²))=+648 kg m/s² while your weight remains
W=mg=(60 kg)(-9.8 m/s²)=-588 kg m/s².
If the elevator aceelerates downwards at 0.5 m/s², your apparent weight is
P=60 kg (-0.5 m/s 2 -(-9.8 m/s ² ))=+558 kg m/s².

• What other common prefixes or abbreviations for powers of ten do you know or can you find ?
• In what everyday places do you see these used ?
  Grocery stores, farms, laboratories, sporting facilities, pharmacies, machine shops.

Calculate the times in these examples. Teachers can use these examples at several different scholastic levels.

Provide the equation as d=(1/2) as t², and have the students re-order the equation.

Making measurements and calculating results involve the concepts of accuracy and precision, significant figures, and orders of magnitude. With these concepts in mind, are the drop times given in the text "correct"?

• How far away is the Mooon?
• How far away is the center of Earth from the center of the Moon?
• Why did we ask the previous question?
• How far away is the surface of Earth from the surface of the Moon
• What are the elevations of different features of Earth and the Moon?
• How are elevations measured?