"End of Chapter Review Lesson" Interactive PPT

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"End of Chapter Review Lesson" Interactive PPT

Part One: Consolidation Layer Knowledge Integration

[Core Quick Fill]

1. concept of force

(1)Vectorality: both ____ and ____.

(2) Effect: Make the object ____, change the ____ of the object.

2. gravity

(1)Definition: The force on an object due to the ____ of the earth.

(2)Formula: G=____, direction____.

3. Elasticity

(1) Classification: pressure, ____ and ____.

(2) Direction: ____ with the deformation trend of the object, so that the object can return to its original shape.

(3) Hooke’s law: F=____.

4. Friction

(1) Sliding friction: f=____.

(2) Static friction: 0

End-of-chapter review lesson PPT, part 2 content: Strengthening the ability of the promotion layer

Analysis of elasticity and friction

1. The difference between elasticity and friction

Generate conditions

Elasticity

(1) Contact with each other

(2) Elastic deformation occurs

Friction

(1) squeeze each other

(2) Rough contact surface

(3) Two objects move relative to each other or have a tendency to move relative to each other

direction

Opposite to the direction of elastic deformation of the object:

(1) The direction of supporting force and pressure is perpendicular to the contact surface

(2) Rope tension along the rope

Opposite the direction of relative motion or relative motion trend

size

(1)Spring force: Hooke’s law

(2) The elastic force of an object undergoing slight deformation: balance of two forces

(1) Static friction is judged by two force balance

(2) Sliding friction: f=μN

2. How to determine the presence and direction of elasticity or friction

(1) Hypothesis method.

(2) Judgment based on the motion state of the object.

(3) Effect method.

[Example 1] As shown in the figure, a wooden block of mass m rests on a vertical rough wall and is acted upon by a horizontal force F. The correct statement below is ()

A. If the block is stationary, the static friction force on the block is equal to mg and is directed vertically upward.

B． If the block is stationary, as F increases, the static friction force on the block increases.

C. If the kinetic friction factor between the wooden block and the wall is μ, when F is removed, the sliding friction force on the wooden block is equal to μmg

D． If F is removed, when the wooden block slides along the wall, the wooden block is acted upon by three forces:

[One word to clear customs]

1The size of static friction has nothing to do with the size of pressure and is judged based on the state of the object.

2. Without elasticity, there is no friction; if there is elasticity, there may not be friction; if there is friction, there must be elasticity.

Force analysis of objects

When performing force analysis on an object, special attention should be paid to the following important links:

(1) Analyze forces in a certain order

According to the conditions under which various forces are generated and the direction of the force, the sequence analysis is based on gravity first, then contact force (elastic force, friction force), and then other forces.

(2) Clarify the research object and distinguish the object from the “outside world”

It is to isolate the object for force analysis from the surrounding objects and distinguish the object from the "outside world". When analyzing force, only consider the force exerted by the "outside world" on the object, and not the force exerted by the object on other objects in the "outside world"; at the same time, do not mistakenly believe that the force acting on other objects is through the "transmission of force" Act on the research object.

(3) Grasp the essence of power and do not blindly “add power”

Force is the effect of an object on an object. Force cannot exist independently of the object, so every force exerted on the object should have a corresponding force-exerting object. A force that cannot find a force-exerting object does not exist.

[One word to clear customs]

1. Only the force exerted by the research object is analyzed, and the force exerted by the research object on other objects is not analyzed.

2. Every time a force is analyzed, the object exerting the force should be found.

3. If the presence or absence of a force is difficult to determine, hypothesis analysis or analysis by changing the research object can be used.

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Update Time: 2024-06-24

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