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1. S/Q, p 3-80 to p 3-81 2. Activity #5, except Bending a stream of water, p 3-84 to p 3-85 3. Discussion: Explaining a PowerPoint Presentation
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1. S/Q, p 3-80 to p 3-81 2. Activity #5, except Bending a stream of water, p 3-84 to p 3-85 3. Discussion: Explaining a - PowerPoint PPT Presentation


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Plan for today’s class 1. S/Q, p 3-80 to p 3-81 2. Activity #5, except Bending a stream of water, p 3-84 to p 3-85 3. Discussion: Explaining a ball toss, p 3-86 to 3-91 4. Change the group members 5. Chapter 4, Activity 1, revisit the table on p 3-6

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slide1

Plan for today’s class

1. S/Q, p 3-80 to p 3-81

2. Activity #5, except Bending a stream of water, p 3-84 to p 3-85

3. Discussion: Explaining a ball toss, p 3-86 to 3-91

4. Change the group members

5. Chapter 4, Activity 1, revisit the table on p 3-6

6. Discuss you results with other group p 4-6 to 4-9

group 1&2, group 3&4, group 5,6&7

7. S/Q, p 4-13

8. Activity 2

During the spring break, try to be aware of any

phenomenon that related to gravitational force.

We will have “show and tell” at the beginning of Mar. 23.

slide4

S/Q, p 3-80 to p 3-81

S1: Does the strength of the gravitational force of

the Earth pulling an object toward the ground

depend on the object’s mass?

What evidence supports your answer? (#3)

S2: What other force, apart from the gravitational force

of the Earth, acts on falling objects?

What types of objects are affected most by this force?

(#4)

slide5

S3: If the force of air resistance is negligible,

does the rate at which a falling object’s speed

increases depend on its mass?

Why do you think this is? (#5)

S4: When a skydiver jumps out of an aircraft he speeds

up at first but eventually, after he has fallen for awhile,

his speed actually becomes constant.

(This is before he opens his parachute.)

Use your ideas about forces acting on the skydiver as

he falls to write a scientific explanation for

why this happens. (#6)

slide6

Explanation: Why does a skydiver speed up at first

but eventually fall at a constant speed?

Describe the situation using a diagram: (Hint: You may

wish to draw two or three force diagrams

for this explanation.) All groups on the white board

slide7

Plan for today’s class

1. S/Q, p 3-80 to p 3-81

2. Activity #5, except Bending a stream of water, p 3-84 to p 3-85

3. Discussion: Explaining a ball toss, p 3-86 to 3-91

Let us start this discussion at 1:25 PM

4. Change the group members

5. Chapter 4, Activity 1, revisit the table on p 3-6

6. Discuss you results with other group p 4-6 to 4-9

group 1&2, group 3&4, group 5,6&7

7. S/Q, p 4-13

8. Activity 2

During the spring break, try to be aware of any

phenomenon that related to gravitational force.

We will have “show and tell” at the beginning of Mar. 23.

slide8

Explaining a ball toss, p 3-86 to p 3-91

During the toss

While you are tossing the ball upward, before the ball

leaves your hand, does the gravitational force of the Earth

act on the ball? Does the hand exert a force on the ball?

Explain your reasoning. (#7)

Are the forces acting on the ball balanced or unbalanced?

How do you know? (#1)

slide10

Ball rising upward after the toss

Does the gravitational force of the Earth act on the ball

while it is rising upward after is has left your hand?

Does the hand exert a force on the ball?

Explain your reasoning. (#3)

slide11

Why does the ball slow down as it is moving upward,

and eventually start to fall back down, after you toss it?

Describe the situation using a diagram:

(#4)

slide12

Narrative: (#5)

During the toss, the force of the hand is transferred to the

ball. But without the hand still pushing it, this force

gradually runs our as the ball rises. As the force runs our,

the speed of the ball decreases as it rises. When this force

runs out completely the gravitational force of the Earth

takes over and the ball begins to fall back down.

slide13

Catching the ball

Which way is the ball moving before you catch it? (#6)

While you are catching the ball, does your hand exert a

Force on it? Does the Earth exert a gravitational force

while you are catching it also? How do you know?

(#7)

After you have caught it, the ball, it is at rest. What must

Have happened to its speed while you were catching it?

(#1)

slide14

In order for this change in speed to take place, would the

combination of forces acting on the ball need to be

balanced or unbalanced? If unbalanced, in which direction

would the strongest force need to be acting-

Upward or Downward? (#2)

slide15

Why does the ball slow down while you are catching it?

Describe the interaction using a diagram: (#3)

slide16

Plan for today’s class

1. S/Q, p 3-80 to p 3-81

2. Activity #5, except Bending a stream of water, p 3-84 to p 3-85

3. Discussion: Explaining a ball toss, p 3-86 to 3-91

4. Change the group members

5. Chapter 4, Activity 1, revisit the table on p 3-6

6. Discuss you results with other group p 4-6 to 4-9

group 1&2, group 3&4, group 5,6&7

7. S/Q, p 4-13

8. Activity 2

During the spring break, try to be aware of any

phenomenon that related to gravitational force.

We will have “show and tell” at the beginning of Mar. 23.

slide18

Plan for today’s class

1. S/Q, p 3-80 to p 3-81

2. Activity #5, except Bending a stream of water, p 3-84 to p 3-85

3. Discussion: Explaining a ball toss, p 3-86 to 3-91

4. Break, Change the group members, end at 2:07 PM

5. Chapter 4, Activity 1, revisit the table on p 3-6

6. Discuss you results with other group p 4-6 to 4-9

group 1&2, group 3&4, group 5,6&7

7. S/Q, p 4-13

8. Activity 2

During the spring break, try to be aware of any

phenomenon that related to gravitational force.

We will have “show and tell” at the beginning of Mar. 23.

slide20

Plan for today’s class

1. S/Q, p 3-80 to p 3-81

2. Activity #5, except Bending a stream of water, p 3-84 to p 3-85

3. Discussion: Explaining a ball toss, p 3-86 to 3-91

4. Break, Change the group members, end at 2:07 PM

5. Chapter 4, Activity 1, revisit the table on p 3-6

6. Discuss you results with other group p 4-6 to 4-9

group 1&2, group 3&4, group 5,6&7

7. S/Q, p 4-13, start at 3:00 PM

8. Activity 2

During the spring break, try to be aware of any

phenomenon that related to gravitational force.

We will have “show and tell” at the beginning of Mar. 23.

slide21

S/Q, p 4-13

S1: Do both ends of a rubbed nail (magnet) behave

similarly or differently when interacting with

another rubbed nail?

How do you know? (#4)

S2: In what way does a rubbed nail seem to be different

from an unrubbed nail when interacting with

another rubbed nail? (#5)

S3: In the initial ideas section of this activity you were

asked what material you think magnets are made

from. How would you answer that question now?

What evidence supports your current answer? (#6)

slide24

Plan for today’s class

1. Activity 3, p2-65

2. Activity 4, p2-69 to 2-72

3. S/Q, p 2-71 to 2-72, will start at 1:10

4. Activity 5

5. Initial Ideas P2-75 to 2-7, will start at 1:35

6. Break

7. Demonstrations will start at 2:05

8. S/Q, p 2-84 to 2-86 will start at 3:00

9. Activity 6

Please throw away the bad markers,

clean your white board,

turn off the monitor.