Chapters 7, 8: Work, Energy & Power

What is work? energy? power?

How do you calculate work?

For a given motion, how does the direction of the applied force affect the amount of work done by the force?

What is kinetic energy? potential energy?

How is net work done on an object related to its change in kinetic energy?

Find the velocity of an object dropped from rest from a height h.

How do seatbelts help protect you from injury? Do they diminish the work done on you in a collision? the force?

How do you calculate gravitational potential energy at large distances from the Earth?

Homework set#6

Homework set#7

*Work, Energy, Power


*Work example

*Kinetic energy

*Potential energy

*Work-energy prinicple

*Energy examples

*Car crash forces

*Seatbelt function

*Gravitational potential

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Chapter 9: Momentum and Impulse

What is momentum?

What is the principle of conservation of momentum?

What is impulse?

Calculate the average force on an object in a collision, given the time of the collision and the change in momentum of the object.

How can you use an understanding of impulse to reduce the force on you in any kind of collision?

Given initial momenta of two objects, calculate the velocity after they collide if the collision is totally inelastic (i.e., they stick together).

What is meant by the center of mass, and what is its significance?

How do you find the center of mass of a collection of point masses?

How do you find the center of mass of a continuous distribution of mass?

What constraint does the conservation of momentum put on the particles involved in a collision?

What is an elastic collision? What additional constraint acts in an elastic collision?

Describe the velocities after a head-on elastic collision between equal masses where the target mass is at rest before the collision.

Describe the same kind of collision if the target mass is very massive compared to the projectile. .. if the target mass is very small compared to the projectile.

Homework set#8


*Conservation of momentum


*Impulse of force

*Impulse calculation

*Minimizing impact force

*Airplane and duck

*Truck and car

*Center of mass

*Inelastic collisions

*Elastic collisions

*Equal mass collisions

*Massive target collisions

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