"Force" Familiar and unfamiliar force PPT courseware 2

Description

"Force" Familiar and unfamiliar force PPT courseware 2

Review and consolidate

1 Straight line propagation of light Examples Small hole imaging Solar eclipse Lunar eclipse Shadow game

2 Principles of imaging by plane mirrors Reflection of light

3 Examples of light refraction phenomena

Mirage, broken chopsticks in water, rainbow, prism, convex lens imaging

Force is the action of an object on an object

Problem discussion

As the magnetic poles of the same name repel each other, objects that are not in direct contact also have a strong effect. Ask students to give some examples of the powerful effects of objects that are not in direct contact.

1 experiment

Ask students to slap the table with their hands, slap each other with both hands, pull rubber bands, and carry school bags to experience the feeling of exerting force and receiving force and think about the characteristics of force.

analyze

1 The hand exerts a force on the table, and the table exerts a force on the opponent.

2 The left hand exerts a force on the right hand, and the right hand exerts a force on the left hand.

3. Pull the rubber band with your hands, and the rubber band also pulls your hands.

4. Lift the bag with your hands upwards, and pull your hands downwards on the bag.

discuss

When an object is acted upon by a force, there must be another object exerting that force on it. The object that receives the force is called the force-receiving object, and the object that exerts the force is called the force-exerting object.

think

1 When you pull a rubber band with your hand, what is the object that exerts force? What is the force-bearing object?

2 Rubber bands also pull hands. What is the object that exerts force? What is the force-bearing object?

Class summary

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

2 The effects between objects are mutual.

3 The effect of force:

a Force can change the shape of an object.

b Force can change the motion state of an object.

practise

1 Force is __________ action, and the action between objects is __________.

The effect of force is to cause the object to __________ or __________ change.

2 In a basketball game, when a shot is missed and the ball bounces off the backboard, _________ exerts force on the ball. Under the action of this force, the ball _________ changes.

3. Pull the rubber band by hand to make it longer. The object exerting the force is _________, and the object receiving the force is _________. The effect of the force is ________. The horse-drawn cart moves forward. The object applying the force is _________, and the object receiving the force is _________. , the effect of force is _________, the object exerting force is ________, the object receiving force is ________, the effect of force is ________.

4Which of the following statements about force is incorrect ( )

When person A pushes the cart, he is also pushed by the cart.

B As long as two objects are in contact with each other, a force will definitely occur.

C When you squeeze a can with your hands, force must be generated.

D The volleyball player spiked the ball and changed the direction of the ball, indicating that force can change the motion state of an object.

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For more information about the PPT courseware "Force Familiar and Unfamiliar", please click on the Force PPT Familiar and Unfamiliar Force PPT tag.

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Update Time: 2024-11-24

This template belongs to Physics courseware Shanghai Science Edition 8th Grade Physics industry PPT template

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