## Conceptual Physics I, Day 7

 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? How can you reduce the force of impact in a car crash? How can you reduce the impact on the driver? If you are not wearing a seatbelts, what do you expect the stopping distance to be in a car crash? Is it possible for your stopping distance to be greater than that of car? 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 does conservation of energy place limits on what a machine can and cannot do? *Work *Energy *Power *Energy examples *Work example *Kinetic energy *Potential energy *Work- energy principle *Car crash forces *Seatbelt function *Stretching seatbelt *Falling object *Simple machines
Index
HyperPhysics***** Physics 7110 Go Back

## Conceptual Physics I, Day 8

 What can you predict by applying conservation of momentum to a collision? Why can't you apply conservation of kinetic energy to a collision? Describe the ballistic pendulum and the things you can learn from the height of its swing. *Elastic collisions *Inelastic collisions *Ballistic pendulum
Index
HyperPhysics*****Physics 7110 Go Back

## Conceptual Physics I, Day 9

 Define pressure - how does it differ from force? If the same force is applied to twice the area, what happens to the pressure? If the pressure of the atmosphere is about 15 pounds per square inch, and the top of your car is about 50 inches by 50 inches, what total force is exerted on the top of your car by the atmosphere? Why doesn't it crush the car top in? How do you find the pressure at a depth in a fluid? If you dive to a depth of 10 meters, how much additional pressure is exerted upon you? What is Pascal's Principle? What is a hydraulic press and what is it good for? How is Pascal's Principle used in the hydraulic press? Can a hydraulic press multiply force? Can it cause something to move further than the force which is applied to the press? Can it do both at the same time? What is the Bernoulli Principle? Is there really such a thing as a curveball pitch in baseball, or is it an optical illusion? How can the Bernoulli Principle cause a ball to curve? What is Archimedes' Principle? What was the basis for Archimedes' conclusion that the king's crown was not made out of solid gold? How can you make use of the buoyant force on an object to determine its density? If your heart were not pumping enough blood through an artery to supply your body's needs, what could be changed to increase the flowrate? If you could increase the blood pressure by 10%, or increase the radius of the artery by 10%, which would be more effective in increasing blood flow? If an artery started to expand because its wall was too weak to withstand the internal blood pressure, would that expansion relieve the stress or tension of the artery wall? What is the origin of the force which pushes the mercury up in a barometer? What force pushes a liquid up a drinking straw? What force moves air into your lungs when you breathe? *Pressure definition *Atmospheric pressure *fluid pressure *Pascal's principle *hydraulic press *hydraulic brakes *auto lift *Bernoulli equation *Baseball curve *Archimedes' principle *buoyancy *Poiseuille's law *Blood pressure *LaPlace's law *barometer *Drinking through straw *Breathing pressure *Ideal gas law
Index
HyperPhysics*****Physics 7110 Go Back