Review, discuss, and analyze the results based on the determination of mass using a fulcrum. Elicit the word and mathematical representation for determination of mass by measuring distances from a fulcrum point. Use M1xD1 = M2D2. Answer all analysis questions from the lab sheet.

We will perform a lab experiment involving pulleys and masses. We will investigate The concept of a block-and-tackle to multiply force to lift heavy objects.

Lab designed to demonstrate how to measure the mass of a large object by use of the rule which determines the relationship between masses and distances from the fulcrum for a balanced seesaw.

Lab to show the effect of increasing the force on a moving object. The force is increased by changing the mass acting on the object and determining the acceleration for each increase in force.

Introduce conservation of momentum . Discuss the effects of a small mass with a large velocity compared to a large mass with. a small velocity. Elicit the law of conservation of momentum and write a math expression to represent it. Discuss elastic collisions. Represent how the momentum prior to a collision is equal to the the total momentum after collision. Represent using model cars moving.

Review elastic type collisions. Discuss the 3 major types of elastic collisions. Introduce nonelastic collisions. Demonstrate and sketch on the board an example of this type of collision. Resolve a problem to determine the velocity.

Discuss how to change momentum, an impulse force must by outside the system. Use as an example a cannon ball fired from a cannon. Elicit that at rest, the system has a zero momentum. The velocity is zero therefore the momentum is zero. Discuss what effects occur when the cannon is fired. Discuss the momentum of the cannon and the momentum of the cannonball. Discuss how the cannon has a large mass but a small velocity (recoil), while the cannonball has a small mass. but a high velocity. Show why the momentum of the system becomes zero. Called the conservation of momentum law-

Discuss f x t impulse.Discuss change in mass equals momentum. Demonstrate how a force extended over a an increase in time results is a change in momentum. Explain why rolling a car into a haystack will result in a force generated over a longer time period resulting in a longer distribution of momentum. A change in impulse will occur when the time is extended which allows the momentum to come to zero over an extended time.

Discuss how best to submit homework assignments, use examples. Review momentum as mass x velocity. Show the effect that an object of mass M1 moving with a velocity of V1 will have on a second object of mass M2 with a velocity of V2 at zero will react when collided. Introduce the formula M1V1 = M2V2 and that the net momentum before the collision must equal the net momentum after the collision. Sketch 3 different possibilities

This lesson was designed to complete the AP chemistry unit. The summary written for AP Chemistry continues into the physics period.