"The Existence of Force" PPT

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"The Existence of Force" PPT

Part One: 1. What is force?

A large number of facts show that force is the action of an object on an object.

There is no force acting without an object or only one object

discuss

1. Can objects produce force without contact?

2. Will a force be generated when objects come into contact?

The action of forces does not necessarily require contact with each other to occur

What effect will the force have?

See what happens to the objects below under the action of force?

1. When you squeeze a beverage bottle with your fingers, what happens to the bottle wall?

2. What happens to the ruler when you bend it hard?

3. When you squeeze the balloon with your fingers, what happens to the balloon?

4. When you pull the spring by hand, what happens to the spring when you press it?

Force can change the shape of an object (force can deform an object)

Think about it?

In football, what phenomena can explain that force changes the motion state of objects?

analyze:

How has the game of football changed?

a. Football changes from static to moving

b. Football moves from slow to fast

c. Football moves from fast to slow

d. Football movement becomes stationary

e. Football's direction changes

The existence of force PPT, part 2 content: 2. The effect of force

1. Change the shape of an object (force can deform an object)

2. Change the motion state of the object

Change the speed of an object

stationary to motion

motion becomes still

slow to fast

Fast becomes slow

Change the direction of motion of an object

The existence of force PPT, the third part content: 3. The interaction of forces between objects is mutual

Exploration experiment: Observe the picture on the right. How many ways can you get the effect of the picture on the right?

A. The left ball does not move and the right ball presses towards the left ball.

B. The right ball does not move and the left ball presses towards the right ball.

C. The two balls press toward the middle at the same time

When an object exerts a force on another object, it also receives the force exerted by the other object on it.

When object A exerts a force on object B, object B will in turn exert a force on object A.

We usually call the action of A on B called force, and the action of B on A is called reaction force.

Understand "power"

Where does the motivation for the squid come from?

The Existence of Force PPT, Part 4: Summary:

1. Force is the effect of ________ on ________.

1. The existence of force can be proved according to ______________.

2. The effect of force can be expressed in two aspects:

One is to cause the object to ________;

The second is to change the motion state of the object, including ________ change and ________ change.

3. The effect of force between objects is ________.

The existence of force PPT, part 5: I will do it

1. The motion state of the following objects has not changed ( )

A. When the car starts, it changes from stationary to moving.

B. A balloon rising at a constant speed in the vertical direction

C. Football rolling on the grass

D. The car is driving at a constant speed on the winding mountain road

2. Understanding of force. Which of the following statements is wrong ( )

A． Force is the action of an object on an object

B. Force can deform an object or change its state of motion

C. The effects of forces between objects are mutual

D. Only objects in contact with each other will produce a force

3. The diver bent the springboard when he stood on it, which shows that force can ____________________;

The upward elastic force of the springboard on the athlete can make the athlete move upward, which shows that the force can ______________.

Keywords: Zhejiang Education Edition seventh grade science PPT courseware for the second volume is free to download, the existence of force PPT download, .PPT format;

For more information about the "The Existence of Force" PPT courseware, please click the "The Existence of Force" ppt tag.

"The Existence of Force" PPT download:

"The Existence of Force" PPT Download Part One: Observation: 1. When your fingers squeeze the balloon, what happens to the balloon? 2. When the spring is stretched and compressed by hand, what happens to the spring? 3. When you pull the rubber band with your hands, what happens to the rubber band? in conclusion: ..

"The Existence of Force" PPT courseware:

"The Existence of Force" PPT Courseware Part One: The Size of Force The unit of force in the International System of Units: Newton Abbreviation: Newton, unit symbol: N This name is named in memory of the great scientist Newton. Our country also uses Newton as the unit of force. You pick up...

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Update Time: 2024-11-22

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 2 industry PPT template

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