"Elasticity" force PPT download

"Elasticity" force PPT download

Part One: Preview Perception

1. Elasticity

1. Elasticity: The property that an object will ______________ when a force is applied and ______________ when no force is applied.

2. Plasticity: The property that an object will deform when it is subjected to force, and ________ will automatically return to its original shape after deformation.

3. Elasticity

(1)Definition: The force generated by an object due to _______________.

(2) Examples: __________, support, __________, etc.

2. Spring dynamometer

1. Purpose: measure ______________.

2. Structure: As shown in the figure, the spring dynamometer is mainly composed of ________, hook, ________ and ________.

3. Principle: Within the elastic limit, the tension on the spring is __________, and the elongation of the spring is _________.

4. When using a spring dynamometer, you must first see its ______________. The force applied to the spring dynamometer is not allowed to exceed ______________.

Elasticity PPT, part 2: interactive classroom understanding

Spring dynamometer usage requirements

When using a spring dynamometer to correctly measure force, "three clears, one check, and no upside down" must be achieved.

(1) "Three Purities":

① Understand the measuring range: Each spring dynamometer has its measuring range. When using it, first estimate the size of the measured force and select a spring dynamometer with an appropriate range. ② Recognize the zero scale line: Before testing, check whether the pointer of the spring dynamometer points to the zero scale line. Otherwise, adjust the pointer to the zero scale line through the zero adjustment knob. If it cannot be adjusted to zero, note the zero point error. ③Recognize the graduation value: Each spring dynamometer has its graduation value, so before use, you must clearly understand how many cows each small grid represents.

(2) "First check": Check whether the spring is damaged and whether the pointer rubs against the shell of the spring dynamometer.

(3) "Do not hang upside down": The measured force (or weight of the object) must act on one end of the hook of the spring dynamometer and cannot be hung upside down.

[Example] Using a spring dynamometer, which of the following statements is incorrect ()

A. When using a spring dynamometer, it must be placed vertically and not tilted.

B. Before use, you must check whether the zero point is accurate.

C. During use, springs, pointers, and hooks must not rub against the shell.

D. When using, it must be noted that the force measured cannot exceed the measuring range of the spring dynamometer.

Before using a spring dynamometer, you should observe: (1) The measuring range is to select a dynamometer with a suitable range to ensure that the force exerted on the spring dynamometer does not exceed its measuring range; (2) The graduation value is conducive to Read quickly and accurately; (3) Is the pointer aligned with the zero scale line? If not, calibrate it to zero; if it cannot be adjusted to zero, remember the zero point error.

Analysis: This question examines the precautions for using the spring dynamometer: before measurement, observe the range and graduation value of the spring dynamometer. The measured force cannot exceed the measurement range of the spring dynamometer. Observe whether the pointer points to the zero scale line. on, otherwise the pointer must be adjusted to zero; the force acting on the hook during measurement must be along the axis of the spring of the spring dynamometer; when reading, the line of sight should be perpendicular to the scale plate; when measuring, do not pull the spring hard or let it The spring dynamometer is stressed for a long time to avoid damage. It can be seen from the above precautions that the spring dynamometer can be tilted, as long as the force acting on the hook can be ensured along the axis of the spring dynamometer spring, for example, to measure the tensile force on the object along the inclined plane.

AnswerA

Elasticity PPT, the third part: try to apply

1. Elasticity

1. Among the following deformations, the one that is not elastic deformation is ()

Analytical elastic deformation is a deformation that deforms under force and returns to its original shape when no force is applied. When an apple falls to the ground, the soil deforms. After the apple is removed, the soil cannot return to its original shape, so this deformation of the soil does not belong to Elastic deformation.

2. Among the following competition scenarios, elasticity is not used in ()

Analysis: Pole vaulting relies on the elasticity of the pole; archery athletes rely on the elasticity of the bow to shoot arrows; divers rely on the elasticity of the springboard to move forward; swimmers use the elasticity of the springboard to move forward in the water. It is the principle that the effects of forces between objects are mutual.

2. Spring dynamometer

3. Before using the spring dynamometer, you must first ______________. As shown in the figure, the spring dynamometer indicates __________.

Analysis Before using the spring dynamometer, you must first observe the range and graduation value of the spring dynamometer. The graduation value of the spring dynamometer is 0.2 N, and the indication of the spring dynamometer is 3.2 N.

Answer Observe the range and graduation value of the spring dynamometer 3.2 N

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For more information about the "Force and Elasticity" PPT courseware, please click on the "Force ppt and Elasticity ppt" tab.

"Elasticity" force PPT teaching courseware:

"Elasticity" force PPT teaching courseware Part 1: Classification practice of knowledge points Knowledge point 1 Elasticity 1. Objects such as rubber bands and springs will _____ when they are stressed, and _______________ when they are not stressed. This property of objects is called elasticity; plasticine, etc..

"Elasticity" force PPT:

"Elasticity" Force PPT Part 1 content: Basic knowledge points Knowledge point 1 Elasticity 1. When the rubber band is pulled hard, the rubber band will deform, and will return to its original shape when no force is applied, indicating that the rubber band has elastic deformation. 2. The basketball hits the backboard and is bounced back, causing the ball to bounce back.

"Power" Power PPT courseware download:

"Force" Force PPT courseware download Part 1: Classification practice of knowledge points Knowledge point 1 The three elements of force and the schematic diagram of force 1. The ______, ______, and _______ of force are called the three elements of force, and they affect the ________ of force. 2. As shown in Figure 7-1-4,...