"How to Understand Force" Force and Machinery PPT Courseware 3

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"How to Understand Force" Force and Machinery PPT Courseware 3

1. Mechanical Motion

The change in the position of an object is called mechanical motion, or motion for short.

Movement is a universal phenomenon in the universe. The universe is in motion, and all objects in the universe are in motion.

Classification of sports:

Straight line motion: motion that passes through a straight line

Curved motion: motion that follows a curve

To determine whether and how an object moves, you must first select a standard object, which is called a reference object.

Reference object

The object selected as the standard when judging whether an object is moving or stationary.

1. In physics, the ________ changes of objects are called mechanical motion. All objects in the world are ________, and absolutely stationary objects are ________. For the same object, whether it is _______ or _______ depends on the reference object selected. If the reference object is different, the motion state described is generally _______. This is the _______ of motion and rest.

2. "The sun rises from the east" in the morning is based on _______. At night, saying "dark clouds covered the moon" is based on _______.

3. The goods in the moving truck are moving relative to _______; they are stationary relative to _______.

4. The passengers sitting in the car traveling eastward are moving with _______ as the reference object, and they are stationary with _______ as the reference object. If the car is used as a reference object, the trees he sees are moving toward _______.

5. Two cars are traveling in the same direction. The passenger in car A sees car B moving backwards. The passenger is using _______ as a reference. Comparing these two cars, _______ car drives faster

Example 1. If the distance between two cars driving on the road remains unchanged during a certain period of time, then during this period of time, if ______________ is used as the reference object, the two cars are stationary; if Using ______ as a reference, they are all in motion.

Example 2. A person rides a bicycle from east to west. At this time, a car speeds past him from behind to the west. If this car is used as a reference, this person ( )

A.To move eastward B.To move westward

C. No movement D. The direction of movement cannot be determined

Example 3. Observing the small flag in the picture, what are the possibilities for judging the movement status of the ship relative to the buildings on the shore?

1.still

2.Movement to the left

3. Move to the right (the ship speed is less than the wind speed)

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"How to Understand Force" Force and Machinery PPT Courseware 2:

"How to Understand Force" Force and Machinery PPT Courseware 2 Force is all around us, and powerful effects are everywhere (a) Ants are carrying food (b) Weightlifters lift barbells (c) Cranes lift heavy objects (d) Due to the magnetic pole of the same name Repulse each other and levitate the magnetic ring.

"How to Understand Force" Force and Machinery PPT Courseware:

"How to Understand Force" Force and Machinery PPT Courseware Learning Objectives: 1. What is force? (Symbol, unit) 2. What effects does force have? (What factors are related to it) 3. Why is it said that the effects of force are mutual? (Application) 1. What is force? The role of force: ..

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Update Time: 2024-10-03

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume 2 industry PPT template

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