"Elasticity" Force PPT Courseware 2

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"Elasticity" Force PPT Courseware 2

Review questions

What are the effects of forces acting on an object?

1. It will cause the object to deform;

Deformation includes changes in shape and volume, and the deformation can be very obvious or very subtle.

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.

Activity 1: Explore the deformation of objects

1. Activity requirements: Use your hands to exert force on rubber bands, springs, balloons, and plasticine, and observe what changes occur to the objects?

2. Communicate observed phenomena and own feelings

1. Deformation:

Changes in shape and volume of objects

1. Elasticity: The property of an object to deform when a force is applied and to return to its original shape when no force is applied.

Such as: rubber bands, balloons, sponges, springs

Hacksaw blades, rulers, erasers, skins, etc.

Elastic deformation:

A deformation in which an object can automatically return to its original shape when no force is applied.

2. Plasticity:

The property that an object deforms when a force is applied and cannot automatically return to its original shape when no force is applied.

Such as: plasticine, flour balls, mud balls, etc.

Inelastic deformation:

The deformation of an object that cannot automatically return to its original shape when no force is applied.

Example 1. 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

How to use and pay attention to the spring dynamometer

1. Before use:

1) Observe the measuring range and graduation value

2) Observe whether the finger points to the "0" marking line (zero calibration),

2. When using:

1) Pull the hook back and forth a few times to prevent the spring from jamming.

2) The force measured should not exceed its range to avoid damaging the spring dynamometer.

3) When measuring force, the direction of the spring should be consistent with the direction of the force being measured, and the spring should not lean against the scale plate.

4) When reading, the line of sight must be perpendicular to the scale surface

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.

Class exercises

1. ____________ is commonly used in physics laboratories to measure the size of force. It is made using the principle of ____________________. The force applied on both sides of it cannot exceed it _______.

2. It is not necessary to use a spring dynamometer ( )

A. The spring dynamometer is placed vertically or horizontally and must not be tilted

B. The pointer must be "zero calibrated" before use.

C. During use, the spring and pointer must not rub against the shell.

D. The pulling force shall not exceed the maximum force that the spring dynamometer can withstand

Summary of this lesson

1. Elasticity: An object can produce force when it deforms elastically

The greater the elastic deformation of an object, the greater the elastic force generated.

Tension, pressure, etc. are all elastic forces.

2. Measurement of force

Tools: dynamometer, spring dynamometer is a commonly used one in the laboratory

Principle: Within a certain limit, the greater the tension, the longer the spring stretches.

Instructions for use: Observe the zero adjustment reading

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

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Update Time: 2024-09-11

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

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