"Power" Mechanical and Power PPT Courseware 3

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"Power" Mechanical and Power PPT Courseware 3

Compared with walking or climbing stairs, which one is more difficult?

When climbing stairs of the same height, what is the difference between walking up slowly and running up quickly?

People don’t do as much work when walking as they do when climbing stairs.

Climbing the same height of stairs, the same person does the same work, but the time spent "walking" and "running" is different. How to distinguish them physically?

The physical meaning of power: a physical quantity that indicates how quickly an object does work.

Knowledge goal:

(1) Understand the concept of power and know the physical meaning of power;

(2) Know the formula for calculating power and the unit of power

Competency goals:

(1) Learn to use analogies to learn new knowledge;

(2) Be able to use power formulas to solve related simple practical problems.

Physical meaning: a physical quantity that expresses how quickly an object does work.

How to compare how fast an object is moving:

(1) Audience: Compare exercise distances at the same time

(2) Referee: Compare times for the same distance

Comparison of work speed:

(1) Compare the amount of work done in the same time

(2) Do the same work and compare the work time

Decide whether the following statements are correct:

1. The more work a machine does, the greater its power.

2. The shorter the time for one person to perform a function, the greater the efficiency.

3. The more work done in the same time, the greater the power.

4. The more time it takes to do the same work, the greater the power.

Example: A crane uses a steel rope to lift a load weighing 10,000N. It rises 10m in the vertical direction at a constant speed within 10 seconds. What is the power of the steel rope to pull the heavy object?

Known: G=104N, t=10s, h=10m

Request: P

Solution: W=Gh=104N×10m=105J

P=W/t=105J/10s=104W

Answer: The power of the steel rope to pull the heavy object is 104W.

Information window: Generally, there is a small brand on the machine called the nameplate, which contains some data, and power is one of them.

Model: 5C11

Flow: 52m3/h

Suction distance: 10m

Power: 1.2kw

What is the physical meaning of power 1.2kW?

It means that the object does 1200J of work in 1s.

Keywords: Power teaching courseware, Machinery and work teaching courseware, Beijing Normal University version eighth grade physics PPT courseware download, Volume 2, Eighth grade physics slide courseware download, Power PPT courseware download, Machinery and work PPT courseware download, .PPT format;

For more information about the PPT courseware "Power Machinery and Work", please click the Power ppt Machinery and Work ppt tab.

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Update Time: 2024-10-27

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume 2 industry PPT template

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