"Force" Motion and Force PPT Courseware 4

Description

"Force" Motion and Force PPT Courseware 4

learning target

Know that force is the effect of an object on an object, and that force cannot exist without an object; be able to correctly identify the force-receiving object and the force-exerting object.

Know that force is a directional quantity; know that the international unit of force is N (Newton); and be able to use a spring balance to measure force.

Able to draw diagrams of force.

Know that the effect of force is to (1) deform the object; (2) change the motion state of the object.

Have a preliminary understanding of the classification method of force, and know that the name of force can be named according to the nature of the force, or according to the effect of the force.

Force is the action of an object on an object

The generation of force cannot be separated from objects (the force-exerting object - the object that generates the force, the force-receiving object - the object that receives the force), and at least two objects must exist at the same time to generate force.

The effects of force are mutual. Object A acts on object B, and object B also acts on object A at the same time. The object exerting force must also be the object receiving force, and the object receiving force must also be the object exerting force. When analyzing the force as the research object When looking at the force on an object, we analyze each force on the object from the perspective of the interaction between the objects. At the same time, we should also clarify the object exerting each force.

There are two situations when objects interact with each other: one is when two objects are in direct contact, such as a portable bucket, etc.; the other is when two objects are not in direct contact but interact through intermediary substances, such as between two magnets. The force between etc.

Three elements of force: magnitude, direction, and point of action

The size of force is measured with a dynamometer (spring balance), and the unit is N (newtons).

Force is a physical quantity with direction.

The point of action of the force is on the object receiving the force.

graphic representation of force

In order to express a force visually, it can be represented by a proportional line segment with an arrow (directed line segment):

The length of the line segment represents the magnitude of the force.

The arrow points in the direction indicating the force.

The nock (or arrow) is often drawn at the point of action of the force (in some problems, for convenience, the object is often represented by a point).

force effect

Deform an object under force.

Change the motion state of the object under force (change the motion state of the object).

Classification of forces

Forces named according to their properties: gravity, elasticity, friction, molecular force, electric force, magnetism, etc.

Forces named according to their effects: tension, pressure, support, power, resistance, etc.

Forces with different effects can be forces of the same nature. For example: the tension of the rope, the pressure of the wheel, the support force of the road surface, etc., are actually all elastic forces.

Forces with the same name named according to their effects may be forces with different properties.

For example: gravity, elasticity, friction, electricity, magnetism, etc., can all be driving forces.

1. If the air resistance is not taken into account, the hand grenade flying in the air is acted upon by the __________ force. The object exerting the force is ____________ and the object receiving the force is ____________.

2. Among gravity, elasticity, friction, buoyancy, supporting force, power, resistance, restoring force, molecular force, electric force, and magnetism, those named according to their effects are ____________, and those named according to their properties are ____________.

3. The effect of force is to change the _________ of the object, or to change the ___________ of the object.

Example: There is an object weighing 25 Newtons placed on an incline with an inclination of 30 degrees. Please use a graphic representation to express the gravity of the object.

Solution: 1. Select the point of action

2. Select scale

3. Draw the magnitude of the force based on its direction and selected scale.

The force exerted on an object due to the attraction of the Earth is called gravity.

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Update Time: 2024-11-22

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume 2 industry PPT template

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