"Elasticity" Force PPT Courseware 3

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"Elasticity" Force PPT Courseware 3

What are the effects of forces acting on an object?

1. It will cause the object to deform;

Deformation: The change in the shape or volume of an object is called deformation

1) Change in shape: refers to the change in the shape of the object under force.

If the spring is compressed, the length of the spring will become shorter or longer.

2) Change in volume: refers to the change in the volume of the object under force.

If you press the balloon hard, the volume of the balloon will become smaller.

The universality of deformation: any object can deform, and there is no object that cannot deform.

2. Can change the motion state of objects:

Changes in motion state include: from rest to motion, from motion to rest, change in speed, and change in direction of motion.

2. Elasticity:

1. Definition: The force generated by the elastic deformation of an object

When the book is placed on the desktop, both the book and the desktop undergo elastic deformation, but this deformation is very small. There is elasticity between the book and the tabletop

2. Conditions for occurrence:

1) Objects are in contact with each other

2) Elastic deformation occurs due to interaction

3. Factors affecting elasticity:

1) The elasticity of the object

2) The degree of elastic deformation of the object

(The greater the deformation, the greater the elasticity)

Example 1.

When a wooden block moves on a horizontal plane, which of the following forces is elastic ( )

A The pressure of the wooden block on the horizontal surface B The support force of the horizontal surface on the wooden block

C resistance force on the block D gravity force on the block

Example 2. Regarding elasticity, which of the following statements is correct ( )

A. The force generated when an object deforms is called elastic force

B. Elastic force can also be generated between objects that are not in contact with each other.

C. Tension is not elastic force

D. A compressed spring can produce elastic force

concept analysis training

Example 1. Is the following understanding of elasticity correct or incorrect?

A. As long as an object deforms, it can produce elasticity

B. Elastic force is generated when an elastically deformed object returns to its original shape.

C. Elasticity is mainly produced to resist its own deformation.

D. The longer the spring, the greater the elastic force; the shorter the spring, the smaller the elastic force.

A is wrong. Elastic deformation must occur;

B is correct;

C is correct;

D is wrong. When a spring is in an elongated state, the longer it stretches, the greater its elastic force; in a compressed state, the shorter it contracts, the greater its elastic force.

Example 2. Analyze which of the following phenomena are elastic forces at work, and how do they work?

A. The object is stationary on the table

B. The small balls tied with thin wires are hung on the wall nails.

C. Satellites orbit the earth

D. The shot arrow moves horizontally

E. The table tennis ball is hit back and forth by the racket on the table.

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Update Time: 2024-09-17

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

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