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Authoritative PPT Summary
"Power" PPT courseware 2
in conclusion:
1. Force is the effect of an object on an object.
1) When an object receives a force, there must be another object exerting force on it. The force-exerting object and the force-receiving object always exist at the same time.
2) Conditions for generating force: there must be at least two objects; there must be interaction between the objects.
Judge the thoughts of several classmates:
1. A single object can also produce force. ( )
2. Force can be produced even without objects. ( )
3. There must be no force between objects that are not in contact. ( )
What is the effect when one object exerts a force on another object?
1. When force is applied to an object, the object will deform;
Deformation includes changes in shape and volume, which can be obvious or very subtle.
2. When force is applied to an object, the motion state of the object will change.
Changes in movement status
(a) The speed changes;
(b) The direction of movement changes;
(c) The speed and direction of motion change simultaneously.
3. Unit of force
1. The unit of force is Newton, or Newton for short, and its symbol is N.
2. Newton was a famous British scientist
3. Understand some common values
.Pick up an apple with your hand. The force exerted by your hand on the apple is about 1N.
.The force used to hold up two eggs is approximately 1N;
.The grip strength of an adult man’s right hand is approximately 700N;
.The pressure exerted by a classmate with a mass of 40kg on the ground is approximately 400N and so on.
4. Schematic diagram of force
Use a line segment with an arrow to express the three elements of force.
The length of the line segment represents the magnitude of the force;
Arrow indicates the direction of force,
The starting or ending point of a line segment represents the point of application of the force.
5. The effects of forces are mutual
When skating, A has a pushing effect on B. A is the force-exerting object and B is the force-receiving object. At the same time, B also has a pushing force on A. At this time, B is the force-exerting object and A is the force-receiving object.
It can be seen that the object exerting force is also the object receiving force, and the effects of forces are mutual.
discuss:
1. Sit on the boat and push the other boat hard. Can you push another boat away while your own boat doesn't move?
Analysis: Because the forces between objects are mutual, when you push another boat hard, you are also pushed by the other boat, so the two boats move in opposite directions at the same time.
2. When rowing a boat forward with an oar, which object provides the force that makes the boat move forward?
A. Water B. Pulp
C. People D. Ship
Analysis: When rowing a boat with an oar, the oar exerts a force on the water. The forces are mutual and are also subject to the reaction force of water. Therefore choose A.
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