1. Momentum = the product of an object’s mass and it’s velocity
Momentum = Mass X Velocity

2. Related to how hard it is to stop a moving object
Momentum
Related to how hard it is to stop a moving object
More momentum = Harder to stop
No velocity = no momentum
Which has more momentum, a parked 18-wheeler or a hummingbird flying by? Why?

3. Examples

4. Examine 3 examples on Page 376
Conservation of Momentum means that it has a constant value, or that momentum does not increase or decrease.
In a closed system, the loss of momentum of one object equals the gain in momentum of another object
Examine 3 examples on Page 376

5. Universal Forces Electromagnetic Forces 2. Strong Nuclear
3. Weak nuclear
4. Gravity

6. Force acts only over a extremely small distance (10-15 meters)
Electromagnetic forces are associated with charged particles
Electric and magnetic forces are the only forces that can both attract and repel
Strong nuclear force acts only on the neutrons and protons in the nucleus of an atom to hold them together
Force acts only over a extremely small distance (10-15 meters)
Force is 100 times stronger than the electric force of repulsion at these distances

8. Gravity is an attractive force between two objects
Weak nuclear is an attractive force that last only over a distance of meters
Gravity is an attractive force between two objects
Changes according to the mass of the objects and their distance from each other
It is the weakest universal force but the most effective over long distances

9. Gravity can cause centripetal force on larger scales such as the orbits of planets and satellites
Centripetal force is a center-directed force that continuously changes the direction of an object to move around the center