"Measuring the Size of Force" Motion and Force PPT Courseware 4

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"Measuring the Size of Force" Motion and Force PPT Courseware 4

What is elasticity?

When objects are acted upon by external forces, their shapes are easily changed. When their shapes change, they will generate a force to restore their original shape. This force is called elasticity.

The greater the force, the longer the extension

1. How to make these two rubber bands elastic

2. Can a rubber band be stretched infinitely?

3. Tell me, which of these two rubber bands has greater elasticity?

4. What conclusion can you draw from this?

How to ensure that the measured force does not exceed the measurement range

What should you pay attention to when using a spring dynamometer to measure force?

1. Understand the measuring range of the spring dynamometer and do not measure forces beyond its measuring range;

2. Understand the scale of the spring dynamometer. Each large square represents how many cattle, and each small square represents how many cattle;

3. Check whether the pointer is pointing at the "0" position. If there is a deviation, adjust it until the two are aligned.

4. Before measuring, gently pull it back and forth several times with your hands to avoid friction between the pointer, spring and housing, which may affect the accuracy of the measurement.

5. When reading, keep your sight level with the pointer.

Let's make a spring dynamometer

Materials: paper clips, cardboard, rubber bands

Steps: Use a paper clip to fix one end of the rubber band on the cardboard, and use a paper clip as a hook on the other end to mark the scale.

Thinking: How to correctly draw the scale of a rubber band dynamometer?

(Use hook code and other methods to mark the scale in time: each hook code weighs 50 grams)

Measuring force

1. “N” in the picture means ______.

2. The spring dynamometer is mainly composed of ______, ______, ______, ______, ______, etc.

3. When using a spring dynamometer, does it need to be zeroed? ______.

4. Can the force of 10N be measured using the spring scale as shown in the picture?

Measuring force - spring dynamometer

Principle: Within the elastic limit, the greater the pulling force, the longer the elongation.

Structure: spring, pointer, scale plate, hook, lifting ring, shell

use

1.The pointer points to “0”

2. Do not measure forces beyond the range;

3. Understand the scale.

4. The reading line of sight is level with the pointer.

Summary: Spring Dynamometer

① Structure: spring, dial, pointer, lifting ring, hook.

②Measurement principle: When the spring is stretched within a certain range, the greater the tension on the spring, the greater the elongation of the spring.

③Correct usage:

a. Understand the measuring range (range) of the spring dynamometer, and do not measure force beyond its range;

b. Understand the scale of the spring dynamometer. Each large square represents how many cattle, and each small square represents how many cattle;

c. Before measuring force, align the pointer with the zero scale line. If there is any deviation, adjust it until the two are aligned;

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"Measuring the Size of Force" Motion and Force PPT download:

"Measuring the Size of Force" Motion and Force PPT Download

Part One: Beginner’s Exploration

A spring dynamometer is a tool for measuring force. It is called a spring balance in life.

Classification of spring dynamometers

flat spring

Dynamometer

handle spring ..

"Measuring the Size of Force" Motion and Force PPT:

"Measuring the Size of Force" Motion and Force PPT

Part 1: Understanding the spring dynamometer

In-depth study of motion and force often requires knowing the size of force. A spring dynamometer is a tool for measuring force. It is often called a spring balance in life.

Use force..

"Measuring the Size of Force" Motion and Force PPT Courseware 3:

"Measuring the Size of Force" Motion and Force PPT Courseware 3 Observation Activity: Observe what parts does the spring dynamometer consist of? What is the function of each part? What is the unit of force? In science and technology, it is uniformly stipulated that "Newton" is used as the unit of force, referred to as "Niu", and "N..

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Update Time: 2024-09-23

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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