This document discusses the differences between mass and weight. It defines weight as the force of gravity on an object, which can be calculated using the formula w=mg, where w is weight, m is mass, and g is gravitational acceleration. Mass remains constant regardless of location, but weight changes depending on the gravitational force. It provides examples of calculating weight on Earth and the moon using given masses and gravitational accelerations. The key points are that mass is a measure of amount of matter, weight is the gravitational force, and weight can be calculated as mass times gravitational acceleration, which differs on other planets/moons.

1. WEIGHT
Reported by:
Ailene A. Meking

2. Objectives
• Differentiate Mass and Weight.
• Calculate the weight of an object in different
gravitational force of a planet.

3. What is weight?
• Weight (w) is just another word for the force of
gravity(Fg).
• Weight is a force that acts at all times on all
objects near Earth.
• The Earth pulls on all objects with a force of
gravity downward toward the center of the
Earth.

4. • The weight of an object is defined as
the force of gravity on the object and may be
calculated as the mass times the acceleration of
gravity, w = mg.
• Since the weight is a force, its SI unit is the
newton(N).

5. Is weight different from mass?
• The weight of an object will change if the object
is brought farther away from Earth, or placed on
a different planet, since the force of gravity on
the object will change.
• Weight symbol is w.
• Weight has unit of Newton(N).

6. Is weight different from mass?
• However the mass of the object will remain the
same regardless of whether the object is on
Earth, in outer space, or on the Moon.
• Mass is a fundamental measure of the amount
of matter in the object.
• Mass symbol is m.
• Mass has unit of Kilogram(kg).

7. How to calculate weight of an object.
Formula: w=mg (w=Fg=m x g)
Where :
• w=Weight of object
• m=mass of object
• g=symbol for gravitational acceleration,
expressed as m/s2, or meters per second
squared.
• At the Earth's surface, where g=9.8 m/s2

8. Example 1:
• An object has a mass of 100 kilograms. What is its
weight on the surface of the earth?
• Solution: w=mg
m=100kg
g= 9.8 m/s2
w= 100kg x 9.8 m/s2
• This gives us the final answer. On the surface of the
earth, an object with a mass of 100 kg will weigh
approximately 980 Newtons.w = 980 N.

9. Example 2:
• “Juliet has a mass of 40 kilograms. What is her weight
on the surface of the moon?“
• Solution: w=mg
m=40kg
g= 1.6 m/s2
w= 40kg x 1.6 m/s2
• This gives us the final answer. On the surface of the
moon, Juliet with a mass of 40 kg will weigh
approximately 64 Newtons. w = 64 N.

10. References
• Retrieved from:
http://hyperphysics.phy-astr.gsu.edu/hbase/mass.html
April 14,2018
https://www.khanacademy.org/science/physics/forces-
newtons-laws/normal-contact-force/a/what-is-weight
April 14,2018

11. Application ½ crosswise-5 mins only
• Choose a partner
• Calculate the Weight of your partner on different
gravitational force using the formula (w=mg)
Earth where g=9.8m/s2
Moon where g=1.62m/s2
Mars where g=3.71m/s2

12. Quiz

13. Assessment Quiz :1/2 sheet of paper
1-2.Write YES or NO only
1.If a scale says 80 kg after you step on it, is
that a measure of your weight?NO
2.If 2 kg of feather weighs 19.6 Newtons,
does 2 kg of nails weigh 19.6 Newtons?
YES

14. 3. James steps on the scale and it says
100 kg. His brother steps on the scale and it
says 220 pounds. Who is heavier?
a. James
b. his brother
c. Both a & b

15. 4. An orange weighs about 2 N. What is the
mass of the orange in grams?
a. 0.20grams
b. 200grams
c. 20grams
d. 0.020grams

16. 5. If your mass is 2,500grams , how much would
you weigh on the moon? Where g= 1.6 m/s2.
a.24.5N
b.4000N
c.4N
d.24,500N