"Measurement of Elasticity and Force" Motion and Force PPT Courseware 3

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"Measurement of Elasticity and Force" Motion and Force PPT Courseware 3

Do you know how much force she used? How to know for sure?

The above objects are affected by _____, and their _______ changes. Due to ___________, these objects also produce force on the force-exerting object.

The force produced when an object changes shape is called elastic force

The greater the deformation of an object, the greater its elasticity.

The greater the tension on the spring, the longer the spring stretches

The working principle of the spring balance: In physics, we use the elongation of the spring to be proportional to the tensile force it receives, and make a spring dynamometer to measure force.

Use of spring dynamometer

1. Zero adjustment before use

2. See clearly its range and graduation value (roughly the same as those of the scale). The force applied to the spring dynamometer must not exceed its maximum measurement value, otherwise the spring dynamometer will be damaged.

3. When measuring, make sure the spring extension direction of the spring dynamometer is on the same straight line as the direction of the measured force.

Practice correct use of spring dynamometer

Equipment: spring dynamometer, wooden block, long board, a hair (or small piece of paper)

step 1. Recognize the measuring range of the spring dynamometer and how many cows each small grid represents.

2. Pull the scale hook with your hand until the pointer points to 1N and 5N, and feel the force of 1N and 5N.

3． On a long wooden board placed horizontally, use a spring dynamometer to pull the wooden block forward at a constant speed and read the pulling force.

4. Tie a piece of hair (or a small piece of paper) to the scale hook of the spring dynamometer, pull the hair hard, and read the pulling force when the hair (or small piece of paper) is pulled off.

In conclusion:

1. Before using the spring dynamometer, it is best to gently pull its hook back and forth several times. What are the benefits of doing this?

2. What should you do if the pointer of the spring dynamometer you use does not point to the zero position before use?

practise:

1. The pointer position of the spring scale is as shown in the figure. At this time, the pulling force on the spring scale is () N; its measurement range is () N.

2. Drawing question: Object A is subject to a gravity of 8 N, and the pulling force of the rope on Object A is 4 N. Draw these two forces using a force diagram.

3. The length of the spring is 10 cm. When the spring is pulled with a force of 1 Newton, the length of the spring is 11 cm. When the force of 5 Newton is used to pull it, the length of the spring is: ()

A. 10 cm; B. 15 cm; C. 50 cm; D. 55 cm.

4. When using a spring scale, the following practices are correct: ()

A. The spring scale should be adjusted before use so that its pointer is aligned with the zero point; B. The spring scale must be placed vertically and not tilted;

C. When in use, the spring, pointer, and hook of the spring scale must not rub against the outer casing; D. When in use, it must be noted that the measured force must not exceed the range of the spring scale.

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Update Time: 2024-11-21

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