"Two Force Balance" Motion and Force PPT Download

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"Two Force Balance" Motion and Force PPT Download

Part One: Preview Perception

1. Balance

1. Equilibrium state: The object remains at rest or moves in a straight line at a constant speed.

2. Balance of forces: When an object is acted upon by several forces, if it remains in equilibrium, it is said that these forces are balanced.

2. Conditions for balance of two forces

1. Two forces acting on the same object.

2. Equal in size.

3. Opposite direction.

4. Act on the same straight line.

3. Application of two-force balance balance

1. When an object is in equilibrium under the action of two forces, the magnitude and direction of one force can be inferred from the magnitude and direction of the other force.

2. If an object is acted upon by a balancing force, the object is at rest or moving in a straight line at a constant speed.

Two Forces Balance PPT, Part 2: Interactive Classroom Understanding

How to determine the balance of two forces

(1) Judgment based on the conditions for the balance of two forces: the two forces are equal in size, opposite in direction, act on the same straight line, and act on the same object, that is, "equal magnitude", "opposite", "same body" and "collinear" . These four conditions are indispensable.

(2) Judgment based on whether the object is in a state of equilibrium: If an object is under the action of two forces, if it is in a state of equilibrium, then the two forces on the object are balancing forces.

[Example] The tea cup is stationary on a horizontal table. The following are a pair of balancing forces: ()

A. The gravity on the teacup and the pressure of the teacup on the table

B. The gravity on the teacup and the support force of the tabletop on the teacup

C. The pressure of the teacup on the tabletop and the support of the tabletop on the teacup

D. The gravity on the teacup and the gravity on the table

Tips The key to this question is to determine the conditions for the balance of two forces, and analyze it according to the following ideas:

Analysis This question tests the judgment of balance force. The gravity of the teacup and the pressure of the teacup on the tabletop act on the teacup and the tabletop respectively. These two forces do not act on the same object and are not balanced forces, so A does not meet the meaning of the question; the pressure of the teacup on the tabletop and the pressure of the tabletop on the teacup The supporting force of , these two forces act on two objects respectively, are not balanced forces, so C does not meet the meaning of the question; the gravity on the tea cup and the gravity on the table, these two forces also act on the two objects respectively, Moreover, the directions of these two forces are the same and are not balanced forces, so D does not meet the meaning of the question; only B meets the meaning of the question.

Answer B

Two force balance PPT, the third part: try the application

1. Balance state and balance force

1. In the scenario shown in the figure, the two-force balance is ()

2. In the following examples, the object acted upon by the balancing force is ()

A. A roller coaster moving on a circular track

B. The train slows down and enters the station

C. A rocket rising in the sky and accelerating

D. A car driving in a straight line at a constant speed on the road

3. Explore the conditions for the balance of two forces. The purpose of the experiment is to explore the relationship between the two forces when the object is only acted upon by two forces and is in a stationary or _______________ state. During the experiment, you need to write down the indication of ______________. If the two forces acting on the object have the same direction during the experiment, the object ____________________ (optional "possible" or "impossible") is in equilibrium.

3. Application of two force balance

4. As shown in the figure, when the lamp is stationary, the relationship between the gravity G on the lamp and the pulling force F of the rope on the lamp is ()

A.G>F

B.G=F

C.G

D. Unable to determine

5. As shown in the figure is a schematic diagram of an elevator moving upward at a constant speed. If F is used to represent the tension of the steel cable, and G is used to represent the gravity on the elevator, then the schematic diagram that can correctly represent the force on the elevator is ()

6. As shown in the figure, the skydiver and the parachute are falling in a straight line at a constant speed in the air. It is known that the total weight of the parachutist and the parachute is 750 N, then the resistance force experienced by the parachutist and the parachute is ________N, and the direction is ________.

Keywords: Free download of PPT courseware for the second volume of eighth-grade physics published by the People's Education Press, download of two-force balance PPT, download of motion and force PPT, .PPT format;

For more information about the PPT courseware "Motion and Forces and Balance of Two Forces", please click on the "Movement and Forces ppt Two Forces Balance ppt" tab.

"Two Force Balance" PPT teaching courseware on movement and force:

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"Two Force Balance" Motion and Force PPT:

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Update Time: 2024-07-08

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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