## Chapter 4: Energy

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.

Given the mass of an object and the height from which it is dropped, can you calculate its impact force when it hits?

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

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).

 8 9 10 12

*Work, Energy, Power

*Work

*Work example

*Kinetic energy

*Potential energy

*Work-energy prinicple

*Energy examples

*Car crash forces

*Seatbelt function

*Momentum

*Conservation of momentum

*Collisions

*Impulse of force

*Airplane and duck

*Truck and car

*Inelastic collisions

*Elastic collisions

Index
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