September 6 – 8, 2011Welcome Assignment

•Get Science Notebook•Write in your planner

–Period 1 & 2 Due Sept. 7, Wednesday – Mass and Gravity Activity–Period 4, 5, & 6 Due Sept. 8, Thursday - Mass and Gravity Activity

•Volunteers to pass back graded work

While you are waiting for your folder & papers:Write in your notebook… which object is the largest in our solar system, and what revolves around it?

Gravity and the Universe

• Composition – What things are made of?• How do things in the universe move?

– Force– Newton’s laws of motion

• Inertia• Force = Mass x Acceleration• For every action there is an equal and opposite

reaction

GRAVITY an attractive force between two objects

Major Concepts

• Define the following words: (page 16)– Force– Gravity– Law of Universal

Gravitation– Mass– Weight– Inertia– Newton’s first law of

motion

• Complete the following tasks:– Double bubble map

• Mass vs. Weight– Multi-flow map

• To answer how gravity is affected by mass and distance

– Page 18 Analyzing Data

– Page 19 Section 2 Assessment

• Get Science Notebook and Glue stick– Paste in the two half sheets just like this…

September 6 – 8, 2011Welcome Assignment

Mass and Gravity - Ball ActivityMass and Gravity

Exploratorium

Mass and Gravity - Ball ActivityGravity – Brain Pop

• Activity – Question: Does gravity act differently on different objects?– Objects: tennis ball and sheet of paper– Hypothesis: If two different objects are dropped at the same height,

then the objects will…________________• fall at different speeds • fall at same speed• fall faster than the other• fall slower than the other

– Observations:

– Conclusion: Why did the flat paper reach the floor after the ball? Why did the crumpled paper’s speed change?- Apply the concept: Describe what the universe would be like if there

was no gravity.

Tennis Ball vs. Flat Paper

Tennis Ball vs. Crumpled Paper

Mass and Gravity • http://

www.exploratorium.edu/ronh/weight/index.html• Input your weight on earth and compare your

weight for each of the nine planets. (You may use 45Kg or 100 lbs if you prefer)

• What trends do you observe? – Put your numbers in order from largest to smallest– Do you notice a correlation between your numbers and

the mass of the planets?• What is the difference between “weight” and

“mass”?

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