Bell ringer- How is the mass of an
object related to it’s gravitational
pull?
What did we talk about yesterday?
Review -write in notebook to keep
1. Define weight
The force gravity exerts on an object due to its mass.
2. Define mass
Measures how much matter in an object which would
effect an object’s inertia
3. Define Newton’s Law of Universal Gravity
states that any two bodies in the universe attract each
other with a force that is directly proportional to the
product of their masses and inversely proportional to
the square of the distance between them.
4. What equation would you use to find your
weight on other planets?
Weight= mass X surface gravity
Newton’s second law
• The second law states that the acceleration of
an object is dependent upon two variables the net force acting upon the object and the
mass of the object.
• We will use
– Weight (force) = Mass X Gravity(acceleration)
Video clip
• Science drawing
https://www.youtube.com/watch?v=M6iI5T3Y
zbo
• guys demo
https://www.youtube.com/watch?v=iwP4heW
Dhvw
Worksheet W=MXG
Weight is a measure of the gravitational force
between the object and the Earth. The
acceleration of gravity on Earth is 9.8 m/sec2.
Weight is measured in units of Newton’s. If one
object has more mass than another then it
weighs ( more / less ) than the other object. As
an astronaut goes to the moon, his mass
remains the same but his weight decreases.
This is because as he got further away from the
Earth, the acceleration of gravity decreases.
W= MXG
1. Write equation
2. Fill in substitutions/show
your work
3. Write your answer with units