"Power" PPT courseware 3

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"Power" PPT courseware 3

The effects of forces are reciprocal.

In physics, force is represented by the symbol F, the unit is Newton, or Newton for short, and the symbol is N.

Experience the size of 1N:

Ask students to hold up an apple with their hands. The force exerted by their hands on the apple is approximately 1N. The force used to hold up two eggs is about 1N; the grip strength of an adult man's right hand is about 700N; the pressure of a classmate with a mass of 40kg on the ground is about 400N, etc.

2. Effect of force

force effect

Change movement status

The speed changes

direction of movement changes

The speed and direction of motion change at the same time

Change the shape of an object

What factors are related to the effect of force?

practice

1. Draw a schematic diagram of the supporting force on an object placed on the ground.

2. Draw a schematic diagram of using a pulling force of 10N to pull the car at an angle of 30 degrees to the horizontal ground.

Regarding the concept of force, which of the following statements is wrong ( )

A force is the effect of an object on an object. Without the object, there is no force effect.

B does not need a force-exerting object, but there must be a force-receiving object.

C When the object we usually talk about is acted upon by a force, there must be another object exerting force on it.

D There must be a force between objects in contact with each other

① Knead the dough hard, and the shape of the dough changes; ② The basketball hits the backboard and bounces back; ③ Hold the small ball hard, and the ball becomes deflated;

④A gust of wind blew the dust on the ground flying all over the sky. Among these phenomena, the object changes its motion state due to force ( )

A①② B②③ C③④ D②④

Summary

1. Two effects of force

Change the shape of an object

Change the motion state of an object

2. force

Three elements of force: magnitude, direction, and point of action

Unit: Newton, referred to as Newton, symbol N

Concept: Force is the effect of an object on an object

The effects of forces between objects are mutual

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Update Time: 2024-09-16

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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