FORCE AND PRESSURE INTRODUCTION TO SCIENCE SPRING 1999

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At the end of this section you need to be able to address the following  (See Chapter 2 for information):

1. What is the difference between mass and weight?
2. What is the relationship between force, mass, and acceleration?
3. State Newton's three laws of motion.
4. What is the relationship between force and pressure?
5. If one quantity is proportional to another quantity, does this mean they are equal to each other?  Explain briefly, using mass and weight as an example.
6. An object is being pushed in a straight line by a constant force.  Is it moving at constant velocity?  at constant acceleration?  What would happen if the applied force were doubled?  How about if the object's mass were also doubled?
7. Consider the cases below ignoring friction and air resistance.  For each, is a force being applied?  Is there acceleration?  If so, is acceleration constant?  Is velocity constant?
• a ball rolls across a floor
• a ball rolls down a smooth ramp
• a ball falls off the edge of a table
• a ball that had been rolling across a floor now heads up a steep ramp
8. Two ice skaters meet.  One weighs 100 lbs., the other weighs 200 lbs.  From a dead stop, they use their hands to push off from each other.  In which direction will each skater go?  Which skater will glide further?  Explain using Newton's laws.
9. Be able to make calculations regarding pressure and buoyancy such as you did in class.
10. How does one calculate the amount of pressure exerted by the atmosphere on an object on Earth?