Momentum = the product of an object’s mass and it’s velocity

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Presentation transcript:

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

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?

Examples

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

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

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

Gravity is an attractive force between two objects Weak nuclear is an attractive force that last only over a distance of 10-18 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

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