"Motion and Friction" Motion and Force PPT Download

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"Motion and Friction" Motion and Force PPT Download

Part One Content: Preliminary Study of the New Course

When an object moves on the surface of another object, friction occurs at the contact surface between the two objects. Therefore, the moving object experiences a force that hinders its movement. This force is called friction.

Can the friction be felt?

Method: Put your hand on the desktop and drag it. How much force do you feel? Lift your hands off the table and do the same movement. How much force does it feel like? In comparison, what is the difference between the two force levels?

Can friction be measured?

Experiment name: Measuring the friction force

Experimental method: Use a dynamometer to pull an object in the horizontal direction, just enough to make the object move. Do you feel that the friction force on the movement of these objects is the same?

Motion and friction PPT, part 2: expansion and extension

friction in life

1. Friction when holding chopsticks;

2. Friction between people and trees when climbing trees;

3. Friction when holding the oil bottle;

4. When braking, the friction between the car tires and the ground;

5. When writing with a pencil, the friction between the pencil tip and the paper;

We cannot live without friction, and some friction is beneficial to life. For example: shoes rub against the ground to make people move forward; brushes brush the floor to remove dirt; chopsticks pick up food, etc. Some friction is harmful, such as mechanical wear and tear, rusty wheels that cannot rotate, etc. So friction is both beneficial and harmful.

So how to increase friction and reduce friction?

Ways to increase friction:

(1) Increase the roughness of the contact surface;

(2) Increase the weight of the object.

Ways to reduce friction are:

(1) Add lubricating oil;

(2) Form a layer of air cushion on the contact surface of the object;

(3) Reduce the roughness of the object contact surface.

Motion and Friction PPT, Part 3: Classroom Training

1. Fill in the blanks

1. The size of the friction force is related to the smoothness of the contact surface of the object, and also related to the ( ) of the object.

2. The lighter the object, the greater the friction force ( ); the heavier the object, the greater the friction force ( ). The closer the surface of the object is ( ), the greater the friction force is ( ); the closer the surface of the object is ( ), the greater the friction force is ( ).

2. Judgment

1. The amount of friction cannot be measured. ( )

2. Friction can be felt. ( )

3. Friction is both beneficial and harmful. ( )

4. When the car is moving, the tires will rub against the ground. ( )

Motion and Friction PPT, Part 4: Homework

Check the information to explain under what circumstances friction is harmful? Under what circumstances is it beneficial?

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For more information about the "Motion and Forces Motion and Friction" PPT courseware, please click the Motion and Forces PPT Motion and Friction PPT tab.

"Motion and Friction" Motion and Force PPT:

"Motion and Friction" Motion and Force PPT Part 1: Object Movement and Friction When an object moves on the surface of another object, friction will occur at the contact surface of the two objects, so the moving object will experience a force that hinders the movement. , this force is called friction..

"Motion and Friction" Motion and Force PPT Courseware 5:

"Motion and Friction" Motion and Force PPT Courseware 5 When an object moves on the surface of another object, friction will occur at the contact surface of the two objects. When friction occurs, a moving object experiences a force that hinders its movement. This force is called friction. We used a dynamometer along the water...

"Motion and Friction" Motion and Force PPT Courseware 4:

"Motion and Friction" Motion and Force PPT Courseware 4 When an object moves on the surface of another object, friction will occur at the contact surface of the two objects. A moving object is subject to a force that hinders its movement. This force is called friction. Experiment 1: Friction force and contact..

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Update Time: 2024-11-22

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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