1. Ch 12Forces and Motion Support from ch 12/ Evidence
EQ Column (Essential Questions)
Support from ch 12/ Evidence

2. 12.1 Forces Essential Question (EQ) Support ch 12
Describe and give examples of force using SI units.
Explain how motion is affected by balanced or unbalanced forces.
Ex forces: ANY push or pull, weight (spring scale), tackle
Units?!?: Newton (N)
Force to accelerate 1kg at 1m/s2
Balanced:
Unbalanced:

3. 12.1 Forces Support ch 12 Essential Question (EQ) 4 types of friction:
1. Static (not moving)
2. Sliding (opposite motion)
3. Rolling (wheels)
4. Fluid (opposite-in water)
Gravity: pulling object down
Air Resistance: opposite of motion and slows acceleration
Terminal velocity:
Gravity= air resistance
Compare and contract 4 kinds of friction.
Describe how Earth affects falling objects.

4. 12.1 Forces Essential Question (EQ) Support ch 12
Explain the path of a projectile.
Curved path
Motion of falling object (projectile)
Initial forward velocity
Downward vertical force of gravity

5. 12.2Newton’s 1st and 2nd Laws of Motion
Support ch 12
Essential Question (EQ)
Aristotle: Greek scientist/ philosopher; observations/ logic reasoning; bad idea: force is required keep object moving at constant speed
Galileo: Italian scientist; used wooden ramps/balls to show gravity produces constant acceleration; without friction objects would keep moving
Newton: English physicsist; built on Galileo’s work; Principia; laws of motion
Famous dead old guys

6. 12.2 Support ch 12 Essential Question (EQ) Textbook def: blue box
Inertia: object resist change in motion
Objects in rest want to stay at rest AND objects in motion want to stay in motion.
How does Newton’s first law relate change in motion to a zero net force?

7. 12.2 Support ch 12 Textbook def: blue box Formula: a= F/m
Mass: measure of inertia in an object depends on matter in the object
If double mass, ½ acceleration.
Essential Question (EQ)
How does Newton’s second law relate force, mass, and acceleration?

8. 12.2 Essential Question (EQ) Support ch 12
How are weight and mass related?
Mass is measure of amount of inertia
Weight is measure of force of gravity on object
Earth’s gravity= 9.8m/s2

9. 12.3 Newton’s Third Law of Motion and Momentum
Essential Question (EQ)
Support ch 12
State Newton’s third law of motion.
Def: blue box
Action- reaction forces are equal and opposite
Do not cancel/ = 0N bc acting on different objects

10. 12.3 Support ch 12 Essential Question (EQ)
Momentum: product of mass and velocity
Large if product of mass and velocity is large!
What is needed for an object to have a large momentum?

11. 12.3 Essential Question (EQ) How is momentum conserved? Support ch 12
Law of Conservation of Momentum: if no net force acts on system, momentum is conserved
Closed system loss of momentum of one object = grain of momentum of another

12. 12.4 Support ch 12 Essential Question (EQ) Electronegative Forces
Electric Force: + and -, opposites attract
Magnetic Force: metals, poles of magnets (N and S)
Nuclear Forces
Strong: neurons and p+
Weak: short range, same particles
What force can attract and repel?
What force holds the nucleus together?

13. 12.4 Essential Question (EQ) Support ch 12
What is Newton’s law of universal gravitation?
Stats: every object in the universe is attracted to other objects
Affected by mass and distance
Ex. Tides and Satellites