"The Secret of the Pendulum" PPT courseware

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"The Secret of the Pendulum" PPT courseware

Part One: Creating the Situation

Pendulum in life:

1. Observe the pendulum clock

2. Swing

Inquiry activities

Make a pendulum:

Experimental materials: bracket, thin wire, screw cap

1. In order to make the pendulum close to idealization, the cycloid selection avoids using thick wires with a certain mass and chooses thin wires with light mass;

2. Pendulum selection. In order to reduce the impact of air resistance on the swing amplitude, it is recommended to choose a steel ball with a smaller volume and a larger mass as the pendulum ball. If there is no steel ball, a nut can also be used.

Factors affecting the speed of the pendulum.

① The speed of the pendulum and the length of the cycloid.

② The speed of the pendulum depends on the weight of the pendulum and the size of the swing.

Kind tips:

1. The length of the pendulum is the distance from the bracket to the center of gravity of the pendulum.

2. When calculating the number of vibrations of the pendulum ball, it is more accurate to start timing when the pendulum passes the lowest position.

3. One cycle of the pendulum passing through the lowest point is a cycle, and the final experimental data can be averaged or moden.

4. Wind up the clock before using the stopwatch. After returning the watch, if the stopwatch does not point to zero, write down its value (zero reading) and then subtract it from the measured value.

5. Clamp the pendulum with your fingers, straighten the cycloid and slowly raise it (not too high). Check whether the cycloid and the crossbar are perpendicular.

6. Release your hands and let the pendulum swing naturally. The pendulum swing must be strictly controlled to vibrate in a vertical plane.

Part Two: Expansion and Extension

Galileo discovered the isochronism of the pendulum.

The simple pendulum vibrates when the deflection angle is very small (within about 5 degrees). At this time, the vibration of the simple pendulum

The period is directly proportional to the square root of the length of the pendulum, inversely proportional to the square root of the acceleration due to gravity, and has nothing to do with the weight and amplitude of the pendulum. The property that the vibration period of a simple pendulum has nothing to do with the amplitude is called the isochronism of the pendulum.

Part Three: Complying with Standards in the Hall

1. Fill in the blanks.

1. The pendulum is composed of ____ and _____. When the pendulum swings, it swings out and comes back again, which is called ______.

2. The _____ required for each swing of the same pendulum is the same.

3. The swing speed of the pendulum is related to ____________.

4. The pendulum length refers to the distance from the fixed point of the bracket to __________.

2. Judgment.

1. The swing speed of the pendulum is related to the pendulum. ( )

2. For the same pendulum, the longer the pendulum is, the faster it swings. ( )

3. The swing speed is related to the weight of the person on it. ( )

4. The energy of the swing is continuously transformed during the swing, and will stop under the action of external force. ( )

3. Multiple choice questions:

1. The same pendulum must be made to swing faster ( ).

A. Make the cycloid longer B. Increase the weight of the pendulum C. Make the cycloid shorter D Reduce the weight of the pendulum

2. The swing speed of the pendulum is related to ( ).

A. Cycloid B. Pendulum C. Swing amplitude

Keywords: Qingdao version fifth grade science PPT courseware for the second volume free download, The Secret of the Pendulum PPT download, .PPT format;

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"The Secret of the Pendulum" PPT:

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Update Time: 2024-09-11

This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 2 industry PPT template

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