"Exploration - Comparing the Speed ​​of Movement of Objects" Simple Movement of Matter PPT Courseware 4

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"Exploration - Comparing the Speed ​​of Movement of Objects" Simple Movement of Matter PPT Courseware 4

Question 1 In a 100-meter race, athlete A completes the distance in 10 seconds and athlete B completes the distance in 11 seconds. Which athlete runs faster?

Question 2: Car A travels 80km in 2 hours, and Car B travels 170km in 2 hours. Which car moves faster?

Summarize

There are two ways to compare movement speed:

One is to look at the length of time it takes when the displacement is the same;

The second is to look at the size of the displacement when the time is the same.

New question:

If the displacements are not the same and the times are not the same, how can we compare them?

Question 3: The athlete ran 100m in 10 seconds, and the car traveled 72km in 2 hours. Which one is faster, the athlete or the car?

Summary: When the displacement and time taken are different, use the displacement per unit time to compare (unified standard).

speed

Definition: It is a physical quantity that expresses the speed of motion. It is equal to the ratio of the displacement s to the time t used for this displacement to occur. (The distance traveled by a moving object in unit time)

Formula: speed = distance/time v=s/t (which is numerically equal to the displacement per unit time)

Unit: meter/second (m/s) in the SI (International Unit) system. Other units: km/h, cm/s

Direction: Same as the direction of motion of the object (vector)

The speed of the car is "10m/s", which is pronounced as 10 meters per second.

Its physical meaning: the distance a car passes in 1 second is 10 meters.

The speed of the aircraft is "500m/s" pronounced as 500 meters per second.

Its physical meaning is:

The distance traveled by the airplane in 1 second is 500 meters.

Another comparison method of speed -------Image method

Thinking: As shown in the figure, the s-t image of two particles A and B; who moves faster?

Uniform linear motion:

Movement that does not change speed and travels in a straight line is called uniform linear motion. Its important features are that the speed is constant and the motion route is a straight line, that is, the direction does not change; the speed of motion is constant, that is, the distance traveled is the same in any equal time. Both are indispensable. In short, uniform linear motion is motion in which the state of motion does not change. It is the simplest and most ideal mechanical movement.

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Update Time: 2024-11-18

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