Question

day 3 why ... earth than on the moon? mass and weight are not the same thing. mass measures how much matter something has. it doesn’t make a difference whether you are on the moon or on earth—your mass doesn’t change. your weight, on the other hand, is measured by the pull of gravity on your mass. with less gravity on the moon, you weigh less. with more gravity on earth, you weigh more. we don’t generally notice the difference between mass and weight when we weigh ourselves on earth, however. that’s because the gravitational force is nearly the same no matter where you go on earth, so your weight doesn’t vary. a. use the chart to answer the questions. | | weight on earth | weight on the moon | |---|---|---| | child | 65 lbs | 10.8 lbs | | adult | 150 lbs | 25 lbs | 1. how many fewer pounds does the child weigh on the moon than on earth? ____ 2. which is greater, the adult’s weight on the moon, or the child’s weight on earth? what is the difference between them in pounds? _________________________________________________________________ 3. who has more mass on the moon, the child or the adult? explain. _________________________________________________________________ b. if you go on a diet, do you change your weight or your mass? explain. ___________________________________________________________________

Explanation:

Step1: Calculate child's weight difference

Subtract moon weight from Earth weight: $65 - 10.8 = 54.2$

Step2: Compare adult's moon weight and child's Earth weight

Adult's moon weight = 25 lbs; Child's Earth weight = 65 lbs. $65 > 25$. Difference: $65 - 25 = 40$

Step3: Determine mass on moon

Mass doesn't change with location. Adult has more mass on Earth, so same on moon.

Step4: Diet effect on weight/mass

Diet reduces body matter (mass), which reduces weight (gravity pull on mass).

Answer:

1. 54.2
2. The child’s weight on Earth is greater; 40
3. The adult. Mass doesn’t change with location, and adults have more mass than children on Earth, so they do on the moon too.

B. Both. Diet reduces mass (amount of matter), which in turn reduces weight (gravity’s pull on mass).