"Newton's First Law" Motion and Force PPT Courseware 5

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"Newton's First Law" Motion and Force PPT Courseware 5

The effect of force on the motion of an object

Skate, ski, brake, and eventually stop under force.

Demonstration experiment

Equipment: long plank ramp, trolley, towel, glass plate.

step:

① Use smooth wooden boards;

②Place a towel on the template;

③ Place a glass plate on top of the wooden board.

Summarize the phenomenon

①The rougher the surface, the closer the car slides; the smoother the surface, the farther the car slides.

②Conjecture result: If there is no resistance, the car will keep moving.

in conclusion

Without any resistance at all, the car can continue to move along the horizontal plane.

Explanation: Force is not what maintains motion.

Consolidation exercise: Analyze whether the following four sentences are correct?

A. Force is what causes objects to move. Without force, objects would not move.

B． Force is what changes the state of motion of an object. Without force, the state of motion of an object will not change.

C. An object can always move at a constant speed and requires an external force to maintain it.

D． When there is no force on a moving object, it will slowly become stationary.

Characteristics of objects - inertia

Ask the question: What property of an object is called inertia?

Answer: All objects have the property of maintaining their original state of rest or uniform linear motion. We call this property inertia.

Experiment: The small flat plate is struck and suddenly flies out. The ball does not receive horizontal force. Due to the inertia, it remains in its original static state, so it falls into the groove.

How do passengers behave when the bus starts and brakes?

When the car starts, the feet are immediately forced to move with the car, but the upper body needs to maintain its original static state due to inertia and cannot keep up with the movement of the car, so it has to lean backward relative to the car; when braking, the feet are forced to stop immediately, and the upper body needs to be moved due to inertia. Maintain the original state of exercise,

So fall forward.

analyze

1. After student A quickly pulled out the paper tape, he found that the chess piece did not fall.

Explanation: The paper twitched faster, and the chess piece did not suffer a large horizontal impact and remained in its original static state due to inertia.

2. Student B struck a chess piece horizontally, and the ones above moved down and were stacked together without falling.

Explanation: The unhit chess pieces, due to inertia, want to maintain their original static state, so they do not move in the horizontal direction and move down and are stacked together.

Applications and dangers of inertia

Question 1. The thrown stone is no longer affected by the force of the hand, so why is it still moving?

Question 2. Does the kicked football still have driving force as it continues to roll forward?

Question 3. After the bullet flies out of the muzzle, what does it rely on to move quickly?

Question 4. In a moving car, if the driver finds someone crossing the road in front of him, what measures should be taken? But the car still has to continue moving for a certain distance before stopping. Why? After the car stops, does the inertia disappear?

Think about the answer:

1. Inertia keeps the stone in motion.

2. Without driving force, it is a manifestation of inertia.

3. Rely on inertia to maintain the speed when leaving the muzzle.

4. Emergency braking is required. Although there is braking resistance, the car still has to move forward for a certain distance due to the large inertia. When the car stops, the inertia still exists, it just changes to a new stationary state.

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Update Time: 2024-09-16

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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