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Completed work: Table of results, calculated averages and summary
Exploring Mass and Weight
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Weight/ Mass
Observations:
Find the average for w/m: _______
Title: Lab: Exploring Mass and Weight Date:
Summary: What is a Newton?What does this number you calculated for the average represent? How close were you to actual number?
1 2 3 4 5 6 7 8 9 10
Mass (g kg)
Weight (N)
W ÷ m
Use digital balance
Use Newton spring
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Weight and Mass
Weight is a measure of the force of gravity on an object
Weight = Mass x acceleration due to gravity
w= mg
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Second Law of Motion: The law of Acceleratio
n
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2nd Law of MotionForce = mass x acceleration F = m x a W = m x gWeight = mass x gravity
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Acceleration due to gravityConstant:
9.8 m/sec/secHow close were you?
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Weight/ Mass
Observations:
Find the average for w/m: _______
Title: Lab: Exploring Mass and Weight Date:
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?
1 2 3 4 5 6 7 8 9 10
Mass (g kg)
Weight (N)
W ÷ m
Use digital balance
Use Newton spring
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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
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2nd Law of Acceleration What would happen if these two objects fell?Think about force, mass, and acceleration
vs.
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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)
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2nd Law of MotionForce = 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?
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2nd Law of MotionForce = 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
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Tie back to 1st lawWhich object would require more force to get moving?
vs.
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INERTIATendency of objects to stay at rest or remain in motionResist change in motion
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Tie back to 1st lawWhich object would require more force to get moving?
vs.