"How to measure and express force" Force and Machinery PPT Courseware 2

Description

"How to measure and express force" Force and Machinery PPT Courseware 2

learning target

1. Understand the spring dynamometer and its measurement principle;

2. Be able to use a spring dynamometer to measure force;

3. A schematic diagram showing force can be used.

Self-study guide 1: Tool for measuring force-spring dynamometer

Student Activities:

1. Self-study textbook 8 pages;

2. Understand the structure and use of spring scales.

1. Understand the spring dynamometer

Structure, range, graduation value

Scale plate, spring, pointer, hanging ring, hook

principle:

Within a certain range, the elongation of a spring is proportional to the tension it experiences

2. Use of spring dynamometer

(1) Zero calibration

(2) The size of the force being measured should be within the measuring range

(3) The extension direction of the spring is on the same straight line as the direction of the measured force.

Class surfing

Measurement of force - spring dynamometer:

(1) Structure: scale plate, spring, pointer, lifting ring, hook.

(2) Principle: Within a certain range, the _____ of the spring is _________ with the tensile force it receives.

(3)Use:

①Pointer_______;

②Clear _______ and ________;

③The extension direction of the spring and the direction of the measured force are on ________;

(4)Note:

① After stabilization, take the reading with your eyes level (can estimate one digit);

②Test pulling back and forth to prevent jamming.

Self-study guide 2: How to express force

(1) Three elements of force

size, direction, point of action

(2) Schematic diagram of force

(3) How to use schematic diagrams to represent force

⑴Determine the force-bearing object

⑵ Determine the point of application of the force and the direction of the force

⑶Draw line segments and arrows to represent force

⑷ Mark the size and sign of force

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Update Time: 2024-10-20

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume 2 industry PPT template

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