9.27.10-10.1.10 Force and energy

In 9.27.10 Energy Transformation

• Obj: we will describe how energy is transferred from the sun to us and then to the ground by writing in our journals.

• TEK 7.7B Chemical Energy to thermal energy • Warm up: 1. What type of energy is the food we eat? 2. What type of energy is the sun?

• In your journal please write at least half a page of how what you ate this morning is actually energy from the sun.

Include: Radiant energy PhotosynthesisChlorophyll Digestion

• With your partner discuss how the food you ate changed from chemical to thermal energy…

• Come up with one answer and write it down.

• Recall: During digestion chemical energy is transformed into thermal energy.

• Summary: Explain how both plants and animals need energy to survive.

• OUT: look at the picture and tell me at least two types of energy the rock has.

In 9.28.10 Word wall

• OBJ: we will create a word wall to help further our understanding of vocabulary.

• TEK: 7.7 a,b,c Force, motion, and energy• Warm up: I am a _____________________I measure __________________In units of __________________

Video clip quiz

1. T or F: objects at rest stay at rest is called inertia2. T or F: Friction is the force that slows down

motion of one surface over another 3. T or F: A car use 20% of its power to overcome

friction of moving parts4. T or F: Hovercrafts have more friction because

of the air it thrusts down5. T or F: Drag is when air slows down an object

YOUR WORD THE FRONT: • The word must be written with at 2” letters• Must have a picture on the front

THE BACK: • book definition• Your definition • Use it in a sentence

Presentation• Explain your picture • Read the book definition • Read your definition • Read the word in a sentence

• Recall: I can use the word wall on tests • Summary: Explain why you should

learn your vocabulary. • OUT: What was your favorite

vocabulary word today? WHY?

In:9.29.10 Shoe Lab• OBJ: we will use our shoe and a spring

scale to explore force. • TEK: 7.7A Force and work• Warm up: How would you describe the

word “force”?

•Record you lab data in your through!

Shoe Drag• Look at the materials. Think about force and

friction and come up with a question/purpose for your lab.

• Materials: A shoeA spring scale Aluminum foilPiece of sand paper

** record the question in your through**

RESEARCH: Newton’s video clip

• Record anything you would like to remember!

Hypothesis

• Please write and IF… then… because… statement to answer your question. RECORD IN YOUR THROUGH!

Example: If I drag the shoe across…. Then it will require …. Because of the amount of …

Create 3 the charts On the desk:

Trial 1 Trial 2 Trial 3 Average Force

Shoe begins motion: Shoe while in motion:

**Make the same chart for: “on aluminum” and “on sand paper” **

Procedures:

1. Select one show from your group2. Use the spring scale to pull the shoe across

the desk. Record the Newtons required to start the motion. Then record the number of Newtons to keep it in motion.

3. Repeat step 2 for aluminum foil. 4. Repeat step 2 for sand paper. 5. Answer the analysis questions.

Analysis questions:

1. Explain how the initial forces and the amount of force to maintain motion differ. (look at averages for each station)

2. Compare the effect of the aluminum to the sand paper on the shoe’s movement

3. What do you predict would happen if you added more mass to your shoe (like rocks inside of it)?

• Recall: friction effects the amount of force needed to move an object

• Summary: Write the conclusion for you lab… it should answer your question and state if your hypothesis is correct.

• OUT: why do you think they have the friction strips on the stairs?

In 9.30.10 unbalanced forces

• Obj: we will distinguish between balanced and unbalanced forces

• TEK 7.7A • Warm up: Define the words balanced

and unbalanced.

Question

• Look at the materials and picture. Think about unbalance forces. Think about transformation of energy.

• Material Marbles 2 rulers Force

Research :

• Newton’s cradle video clip• Newton’s first law of motion: An object at

rest will stay at rest and an object in motion will stay in motion unless acted on by an unbalanced force.

• Unbalanced force: Will cause and object to speed up, slow down, or change direction.

Hypothesis:

• If…. Then… Because

• If I apply force to …. Then …. Because energy….

Newton’s cradle 1. At the station you will find two rulers taped to the

desk and 4 marbles. 2. Place the two marbles a few inches from each other

between the two ruler. 3. Take turns gently tapping one marble so that it rolls

and hits the second one. Record your observations. 4. Place the two marbles together place third marble

several inches away. Take turn gently tapping the single marble so that it hits the other two. Record your observations.

5. Experiment with other combinations of marbles and record your observations.

analysis

1. Describe what happened in the first trial? 2. Where did the force go? 3. What happened as you added more marbles?4. What did you find out when using your own

combinations?

Conclusion (write in your summary)

• Describe how the Newton’s first law of motion relates to your lab

Word wall Presentation

• Explain your picture • Read the book definition • Read your definition • Read the word in a sentence

• Recall: Balanced forces will not change the motion of an object.

• Summary: should be your lab conclusion • Out: Draw an example of an unbalanced

force. Write a sentence to explain it.

IN10.1.10 Quiz• Obj: we will use critical thinking skill to

take a quiz. • TEK 7.7 A and B • Warm up: Sally needs to calculate the

density of a wood block. What tools would she need?

QUIZ! – True or False 1. During the process of digestion thermal energy is

transformed into chemical. 2. An object at rest will stay at rest unless acted on

by an unbalanced force. 3. An object in motion will stay in motion unless

acted on by an balanced force 4. Unbalanced forces cause an object to speed up,

slow down or change direction 5. Friction slows down the motion between two

surfaces that are rubbing each other.

Net force

• The total amount of forces on an object.

Calculating net force

5000N + (–) 50 N = 4050N

5000 N

50 N

• 10,000N + (-)1000N = 9,000N

10,000N

1000N

• 100N + (-)500N = - 400N

500N100N

VIDEOKinetic Energy Potential energy

• Recall: Kinetic energy is moving • Summary: explain why food would be

potential energy• Out: Use the words kinetic energy and

potential energy to describe the process of digestion.