"Newton's First Law" Motion and Force PPT Courseware 8

Description

"Newton's First Law" Motion and Force PPT Courseware 8

force effect

What are the effects of a force acting on an object?

deform an object

Change the motion state of an object

Question: What would the object do if no force was acted upon?

An object at rest always remains at rest when there is no external force acting on it.

Explore

Experimental equipment: inclined plane, towel, tabletop, cylinder

1. Why does the cylinder finally stop on the horizontal surface after sliding down the incline?

Because the cylinder is subject to resistance during movement.

2. If the materials on the horizontal surface are different, will the speed of the cylinder's movement on the horizontal surface decrease at the same rate?

The greater the resistance, the faster the cylinder's speed decreases.

3. Discussion: Using the equipment provided, how do you check whether your idea is correct?

Compare the distance traveled by the cylinder when laying different materials on a horizontal surface.

What information needs to be recorded during the experiment? Draw an experiment record sheet in your notebook.

The material laid on the horizontal surface, the distance that the cylinder can pass on the horizontal surface, the resistance of the cylinder, the roughness of the surface,...

What issues should we pay attention to during the experiment?

Each time the cylinder starts to slide down from rest on the incline from the same position.

Newton's first law

1. Newton’s first law

1. Content: All objects always maintain a state of uniform linear motion or a state of rest when no external force is applied.

2. Understand:

(1) "All objects" - universally applicable to all objects

(2) "No external force" - a specific condition

(3) "Always" - always like this, no exceptions!

(4) "Or" - the two must be one of them, and only one of them, not at the same time

give it a try

1. According to Newton's first law, an object that is originally at rest will _______ when there is no force on it, and an object that is originally in motion will _______ when there is no force on it.

2. Newton’s first law is ( )

A. This is a conclusion obtained directly from the inclined plane trolley experiment.

B． It is just a rule derived from theoretical analysis.

C. Just rules learned through daily life

D． It is a conclusion reached through analytical reasoning based on experiments.

3. The following exercises must be performed with force ( )

A. The object makes a curved motion B. Object moves in a straight line with uniform speed

C. The object is at rest D. The object is in high-speed motion

Extracurricular thinking

A small ball is tied to a rope and moves in a circular motion on a smooth horizontal surface. When the rope suddenly breaks, the ball will ( )

A. Maintain the original circular motion state

B． Keep the speed at which the rope was broken and move in a straight line at a constant speed

C. The speed of the ball decreases rapidly

D． The above three situations are possible

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Update Time: 2024-08-15

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