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Exploring Mass and Weight Completed work: Table of results, calculated averages and summary Title: Lab: Exploring Mass and Weight Date: Use digital balance 1 Weight/ Mass 2 3 4 5 6 7 8 9 Mass (g kg) Weight (N) W÷m Use Newton spring Find the average for w/m: _______ Observations: Summary: What is a Newton? What does this number you calculated for the average represent? How close were you to actual number? 10 Weight and Mass Weight is a measure of the force of gravity on an object Weight = Mass x acceleration due to gravity w= mg Second Law of Motion: The law of Acceleration 2nd Law of Motion Force = mass x acceleration F = m x a W= m x g Weight = mass x gravity Acceleration due to gravity Constant: 9.8 m/sec/sec How close were you? Title: Lab: Exploring Mass and Weight Date: Use digital balance 1 Weight/ Mass 2 3 4 5 6 7 8 9 10 Mass (g kg) Weight (N) W÷m Use Newton spring Find the average for w/m: _______ Observations: Summary: 1) What is a Newton? 2) What does this number you calculated (weight/mass) represent? How close was your average to the actual number of 9.8? 2nd law of Acceleration • How much force do you exert when you take a step? • How about on the moon? (acceleration due to gravity = 1.6 nd 2 Law of Acceleration What would happen if these two objects fell? Think about force, mass, and acceleration vs. How fast they fall misconception • • • http://www.glencoe.com/sites/common_assets/science/virtual_labs/E25/E25.html (different objects on Earth and Moon) http://cccmkc.edu.hk/~kei-yhk/MyProject/falling.html (Galileo’s famous ball vs feather experiment) http://www.physicsclassroom.com/Class/1DKin/U1L5e.cfm (the big misconception) 2nd Law of Motion Force = mass x acceleration F = m x a W= m x g So, if acceleration is held constant, what is the relationship between mass and force? 2nd Law of Motion Force = mass x acceleration F = m x a constant So, if we keep acceleration constant, what is the relationship between mass and force? More mass more force Tie back to st 1 law Which object would require more force to get moving? vs. INERTIA Tendency of objects to stay at rest or remain in motion Resist change in motion Tie back to st 1 law Which object would require more force to get moving? vs.