1. Warm Up: 12/19/16
Pull out your pink lab sheet from Friday. Make sure that is finished up.
Make sure you have a calculator today and tomorrow.

2. Part I
“G” has a VERY small value, approximately ________________, with units of __________.
Newton’s “ULOG” is a ____________ quantity?
Since the force due to gravity on an objects is known as the object’s weight, and since weight equals ______, then (What is the equation for weight?)
The force of gravity between two objects is found by ______________________. (What is the equation?)
What does the equation mean?

3. Part III Triple “d” – Double “m1” –
Think about how the gravitational attraction would change for each of the following situations.
Triple “d” –
Double “m1” –

4. Part V
A 5.0 kg and a 10 kg sphere are 0.3 m apart (center- to-center distance). Find the force of attraction between them. (Answer should be in scientific notation)
3.71 x 10-8 N

5. Part V
A person proceeds away from the earth. How do you expect his weight to vary and why?
It should decrease
What would happen to their mass in the same situation?
Stays the same

6. Part V
Sally (55 kg) and Jimmy (70 kg) have been giving each other googily-eyes in class for weeks. Some say they are “in love”, but others say that they are simply “attracted” to one another. What is the force of attraction between these two, assuming that they sit 10 m apart (from center of gravity to center of gravity) in class? (Answer in scientific notation)
2.56 x 10-9 N

7. A 12 N force is required to accelerate an object at 15 m/sec2
A 12 N force is required to accelerate an object at 15 m/sec2.  What is the mass of this object?
0.8 kg

8. What is the weight of a 75 kg sack of flour on Earth?

9. What is the difference between mass and weight?
Mass is how much matter an object has. Weight is the force of gravity an object experiences.

10. Calculate the gravitational force on the earth due to the sun
Calculate the gravitational force on the earth due to the sun. It is this force which holds the earth in its orbit. (Mass of the Sun is 1.99 x 1030 kg and the distance is 1.5 x 1011 m) Answer in Scientific Notation!
3.54 x 1022 N

11. Part V
The planet Saturn has mass of 5.67 x 1026 kg and radius of 6.3 x 107 m. How much will the gravitational force be on a 60 kg man there standing on the surface?