1. Newton’s First Law of Motion HW
8.0 m/s2
3.4 m/s2
-5.8 m/s2
30.0 m/s2
6.8 km/hr2
6a. An object in motion will remain in motion and an object at rest will remain at rest unless acted upon by an unbalanced force.
6b. Remains in current location unless acted upon by an outside force.
A force. Friction stops or slows down an objects motion.

2. Situation
Sliding Friction
Fluid Friction
Rolling Friction
8. A swimmer in a pool
9. A child on a playground
slide
10. A skydiver in the air
11. A skydiver landing
12. Rubbing hands together
13. An airplane taxiing on
a runway
14. A flying airplane X X X X X X X X

3. Agenda for 5/2/16 Newton’s Law of Gravitation Notes
HW – Gravity and Weight Worksheet

4. Newton’s Law of Universal Gravitation
A) Newton determined that any two masses
exert a gravitational force on each other.
B) The larger the 2 masses, the greater
the force will be.
C) The closer the objects are the greater gravitational force will have.

5. Gravitational Force depends on:
1) Mass of the objects
2) Distance between them

6. Gravitational Formula
Gravity (g) = Mass (m1) X Mass (m2)
distance2 (d2)
Units: g =
m1 =
m2 =
d =
GRAVITATIONAL FORCE (Newtons – N)
MASS OF OBJECT #1 (Kilograms – kg)
MASS OF OBJECT #2 (Kilograms – kg)
DISTANCE BETWEEN TWO OBJECTS (Meters – m)

7. Weight
A. Definition: the measure of the gravitational force on an object.
B. When you stand on a scale to weigh yourself, you are actually measuring the amount of gravitational force pulling on you. C.
Mass is a measure of the amount of matter an object contains.
1. Your mass does not change when you go to the moon but your weight decreases because there is less gravity on the moon.
Weight is a FORCE.

8. Weight (w) = mass (m) X gravity (g)
Weight Formula
Weight (w) = mass (m) X gravity (g)
Units: w =
m =
g =
WEIGHT (Newtons – N)
MASS (Kilograms – kg)
ACCELERATION DUE TO GRAVITY = 9.8 (M/S2)

9. Acceleration due to Gravity
If an object is falling (on Earth) its:
acceleration due to gravity = ________
All objects near the surface of the Earth fall with the same rate of acceleration ___________________________
9.8 m/s2
9.8 m/s2

10. Acceleration due to Gravity
B. If an object is falling (on Moon) its:
acceleration due to gravity = ________
All objects near the surface of the Moon fall with the same rate of acceleration ___________________________
1.6 m/s2
1.6 m/s2

11. Example
Example: a feather and bowling ball will fall with the same rate of acceleration on Earth __________________________.
However,_________________________________________________________
___________________________
9.8 m/s2
A BOWLING BALL WILL HIT THE GROUND FIRST
BECAUSE IT HAS MORE MASS THAN THE FEATHER. THEREFORE,
THE BOWLINGBALL HAS A GREATER VELOCITY.

12. Example
The feather is going to take longer to fall than the bowling ball since the feather will be affected more by _________________________. If there was no __________________________, the feather and the bowling ball would reach the ground at the same time if they were released at the same height at the same time.
AIR RESISTANCE
AIR RESISTANCE

14. Agenda for 5/3/16 Determination of Weight Lab
HW - Mass vs Weight worksheet

15. Determination of Weight Lab:
Use the formula:
Weight = mass of object (in kilograms) x gravity
Only take 1-2 objects at a time (any 10 objects need to be completed.
Put all materials back when done
HW – Gravity and Weight Worksheet (can work on if finished with lab early)