"Elasticity" Force PPT Courseware 4

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"Elasticity" Force PPT Courseware 4

What changes occur before and after the object generates elasticity?

Deformation - change in shape

Elasticity and plasticity:

Elastic deformation and inelastic deformation:

The property that an object deforms when a force is applied and returns to its original shape when no force is applied is called elasticity. The deformation at this time is called elastic deformation.

The property that an object deformed by force cannot return to its original shape after the force is removed is called plasticity, and the deformation at this time is also called inelastic deformation.

Elastic performance: tension, pressure, support, push, tension, support, etc.

Dynamometer

(1) Structure and principle of spring dynamometer

①Light spring; ②Shell bracket with scale; ③Hook; ④Pointer.

The greater the tension on the spring, the longer it stretches. (proportional)

(ii) How to use a dynamometer?

The reading is similar to that of a scale. First read the whole scale, and then estimate the value where the pointer is.

Precautions

①Look at the measuring range

②Pointer zero adjustment

Question 1: If it is inconvenient to adjust the zero, is there a way to use it to measure the force?

(You can first read the reading when no tension is measured, and then measure the reading when a certain tension is measured. The difference between the two numbers is the magnitude of the tension)

③Apply tension along the direction of the spring axis

④Accurate reading

(1) Can you make a spring scale out of rubber bands?

Question 1. In addition to rubber bands, long wooden strips, nails and a standard force gauge have been provided. What other equipment is needed?

Question 2. How to determine the position of the tick mark?

Question 3. What are the steps?

Question 4. Is the scale of your rubber band dynamometer even?

Design

1. You also need a hook and a pointer.

2. You can use a standard dynamometer to calibrate and determine the scale.

3. Steps:

A. Fix one end of the rubber band to one end of the long wooden bar.

B. Fix the hook on the free end of the rubber band and place the pointer on the fixed point.

C. Hook the standard dynamometer and the homemade dynamometer hook together, and gradually increase the pulling force on the parallel wooden pole.

D. Corresponding to the standard dynamometer reading, mark the scale on the wooden pole until the maximum value.

4. The rubber band scales are unevenly distributed.

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Update Time: 2024-10-02

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

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