"Newton's First Law" PPT courseware

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"Newton's First Law" PPT courseware

Contents of Part One: Review: Contents of Newton’s First Law

Why do objects maintain uniform linear motion or rest when no external force acts on them?

All objects have the property of maintaining their original speed and direction of motion.

The property of an object to maintain uniform linear motion or rest is called inertia.

Newton's first law is also called the law of inertia.

Newton's First Law PPT, Part 2: Experiment

1. Place a piece of cardboard on a glass and put an egg on it. When the paper is popped out, will the egg fly out?

The egg and the piece of paper were stationary at first, and the piece of paper was bounced out. The egg still maintained its original stationary state due to inertia, so the egg did not fly out with the piece of paper, but fell into the water under the action of gravity.

2. When the car is suddenly pulled to the right or the car suddenly stops moving, what will happen to the wooden block on it? Why?

3. As shown in the picture, use a cardboard box with a hole (the other seams of the cardboard box are sealed with adhesive tape). Hold the carton with your elbows or knees, let the hole face the lit candle, and clap it with both hands. What do you see?

The candle went out.

The air in the cardboard box moves due to the squeezing of the hand. The air still maintains its original motion due to inertia and continues to move forward, so the candle is blown out.

4. As shown in the picture, if a cup is filled with water and the cup is suddenly pulled rapidly, what will happen? why?

Liquids have inertia.

in conclusion:

1. Inertia is an inherent property of all objects. Whether solid, liquid or gas, whether an object is in motion or at rest, it has inertia.

That is: inertia has nothing to do with the motion state of the object, and has nothing to do with the force on the object.

2. Inertia is only related to mass. The greater the mass, the greater the inertia of the object.

For example: the train must brake early before entering the station.

Newton's First Law PPT, Part 3: Utilization of Inertia

1. The impact can make the hammer and ax head tightly fit on the handle.

2. Shake your hands hard to get rid of the water on your hands.

3. Pat the clothes to remove dust.

4. Run before taking off in high jump and long jump.

5. The bullet can hit the target after exiting the chamber.

6. Planes are dropping relief supplies.

The dangers of inertia

When braking, the vehicle cannot stop immediately due to inertia, resulting in accidents, etc. Therefore, the "overloading is strictly prohibited" and "seat belts must be worn" stipulated by the transportation department are all to avoid harm caused by inertia.

Newton's First Law PPT, Part 4: Class Summary

1. The difference between inertia and Newton’s first law.

①Inertia is ____________ of all objects, and exists at any time along with all external factors such as whether the object is subject to force and its state of motion.

②Newton's first law describes the ___________ that an object follows when there is no external force. It is conditional, that is, it only obeys when the object _________.

2. General steps for explaining inertia phenomena:

①Determine the research object:

②What kind of exercise the research subject originally did;

③What changes have occurred;

④How the research object behaves due to inertia.

Newton's First Law PPT, Part 5: Classroom Exercises

1. Regarding the inertia of an object, which of the following statements is correct ( )

A． Moving objects have inertia, stationary objects have no inertia

B. An object has inertia when there is no force on it, but there is no inertia when there is a force on it.

C. An object has inertia when its state of motion changes, but it has no inertia when its state of motion remains unchanged.

D. Objects have inertia under any circumstances

2. When a hot air balloon rises vertically to a certain height at a certain speed, an object falls out of the hot air balloon. After the object leaves the hot air balloon, it will ( )

A． Continue to rise for a certain distance and then fall

B. whereabouts immediately

C. Rise forever at the original speed

D. None of the above statements are correct

3. Which of the following phenomena prevents inertia ( )

A. When patting the clothes, the dust comes off the clothes

B. The driver and front-seat passengers must wear seat belts

C. After washing your hands, shake off the water droplets on your hands vigorously

D. Long jump athletes should run as hard as possible before taking off.

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Update Time: 2024-09-21

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