"Scientific Inquiry: Newton's First Law" Force and Motion PPT Courseware 2

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"Scientific Inquiry: Newton's First Law" Force and Motion PPT Courseware 2

Observation: Apply a horizontal thrust to the car stuck in the snow, and the car will move in the horizontal direction.

A horizontal thrust is applied to the stationary wooden box, and the wooden box moves in the horizontal direction. After the thrust is removed, the wooden box stops.

Hit the nail with a hammer and the nail will move downward and sink into the board. Stop hammering and the nail will stop sinking.

The kicked football will continue to "fly", but it will always stop.

A train with its engine turned off will continue to run, but will eventually stop.

Is your understanding correct?

The movement of an object requires the action of force. Without force, the object will not move or stop moving.

Experimental exploration:

The effect of resistance on moving objects

1. Ask a question: If a moving object is not affected by other objects, will it continue to move?

2. Conjecture and hypothesis: The greater the resistance, the faster the speed of the car decreases.

3. Make plans and design experiments:

A. Based on the hypothesis, how do you plan to design the experiment?

B. What information needs to be recorded and whether a recording form needs to be designed

C. What influencing factors need to be controlled.

D. Prepare equipment:

Inclined surfaces, wooden boards with different roughness, cloth, towels, trolley scales, etc.

E. Design experiment:

Let the car slide down the inclined plane, gradually reduce the roughness of the plane, measure the distance of the car's movement, and deduce the movement of the car when there is no friction on the plane.

1. Newton’s first law

1. Contents of Newton’s first law:

All objects always maintain a state of uniform linear motion or a state of rest when they are not acted upon by external forces.

2. Understanding of Newton’s first law:

①All objects conform to Newton’s first law.

②The law is summarized by further reasoning based on a large number of empirical facts.

observation experiment

What condition are the original weights and pieces of paper in?

Later, the cardboard was bounced away. Where was the weight?

Due to its inertia, the weight still maintains its original resting state but is not bounced away.

What condition are the original cars and balls in?

Later, the car encountered an obstacle and stopped. Where was the ball?

Because the ball has inertia, it maintains its original state of motion and still moves forward.

2. Inertia

1. Inertia: The property of an object to remain in motion.

——Newton’s first law is also called the law of inertia.

2. Inertia is an inherent property of all objects:

Due to the existence of inertia, an object at rest maintains its state of rest; an object in motion maintains its state of uniform linear motion.

3. Utilization or prevention of inertia

① To prevent the driver from being injured due to inertia during emergency braking, the driver and front-seat passenger must use seat belts.

② If the ax head is loose, hit the tree stump with the lower end of the handle. The ax head will continue to move downward under the action of inertia, and the ax head will be tightened.

③Usually slapping the dust off your body and shaking off the raindrops from your umbrella are all using the inertia of objects.

What did you learn in this class?

1. Contents of Newton’s first law:

All objects always maintain a state of uniform linear motion or a state of rest when they are not acted upon by external forces.

2. Inertia: The property of an object to remain in motion.

3. Inertia is an inherent property of all objects.

Due to the existence of inertia, an object at rest maintains its state of rest; an object in motion maintains its state of uniform linear motion.

Consolidation exercises

1. On a smooth horizontal surface, use a rope to pull the car to move in a straight line. When the speed of the car reaches 4m/s, the rope falls off. At this time, the car makes ______ motion on the horizontal surface. The speed of the car is ______.

2. Experiment: Let the car slide down at the same position on the same slope and enter the horizontal plane. The surface of the horizontal plane is first a towel, then a cotton cloth, and finally a wooden board. It can be observed that the smoother the horizontal surface, the smaller the friction resistance, and the car will slide_ _____; Further reasoning: The smoother the horizontal surface, the more resistance the car will have to its movement, and the car will ______ at a speed of ______.

3. Please give examples of using and preventing inertia in your life.

(1) Utilize inertia: ______ (2) Prevent inertia: ______.

4. The property of an object that remains ______ unchanged is called inertia. Inertia is an inherent ______ of the object itself.

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Update Time: 2024-10-04

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