Completed work: Table of results, calculated averages and summary

Exploring Mass and Weight

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

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 Acceleratio

n

2nd Law of MotionForce = mass x acceleration F = m x a W = m x gWeight = mass x gravity

Acceleration due to gravityConstant:

9.8 m/sec/secHow close were you?

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

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

2nd 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 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?

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

Tie back to 1st lawWhich object would require more force to get moving?

vs.

INERTIATendency of objects to stay at rest or remain in motionResist change in motion

Tie back to 1st lawWhich object would require more force to get moving?

vs.