"Newton's Third Law of Motion" Newton's Laws of Motion PPT teaching courseware

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"Newton's Third Law of Motion" Newton's Laws of Motion PPT teaching courseware

Part 1: Essential knowledge and foundation of literacy

1. Action force and reaction force

1. Definition: A pair of interaction forces between objects is called _______ and _________. Any one of the forces can be called an action force, and the other force is called _________.

2. Characteristics: The action of force is always _______. Mutual action and reaction forces can exist between objects that _____ each other, or between objects that _______ each other.

2. Newton’s third law

1. Content: The action force and reaction force between two objects always have magnitude _____, direction _____, and act on ___________;

2. Place two bar magnets A and B on a smooth table. A has a strong effect on B, and B has a strong effect on A. Then the force of A on B and the force of B on A have the following characteristics:

(1) Size: The force of A on B and the force of B on A, the size is _____;

(2) Line of action: The force of A on B and the force of B on A act on ________;

(3) Survival or death: When A’s force on B disappears, B’s force on A _____ (optional “disappear” or “not disappear”), when A’s force on B changes, B’s force on A changes _____(optional "change" or "no change");

(4) Properties: The force of A on B is gravity, and the force of B on A is _____; the force of A on B is elastic force, then the force of B on A is _____;

(5) Direction: the direction of the force of A on B and the direction of the force of B on A _____;

(6) Acting objects: The force of A on B and the force of B on A act on _____ (optional "same" or "different") objects.

Newton's third law of motion PPT, part 2 content: key abilities and literacy formation

1. Understanding Newton’s third law

1. The relationship between a pair of action force and reaction force:

2. Universality of action and reaction forces:

The relationship between action force and reaction force applies to any object and has nothing to do with the motion state of the object or the choice of reference system.

【Think·Discussion】

When a horse-drawn cart moves forward on the road, while the horse gives the cart a force, the cart also gives the horse a reaction force. The two forces are equally strong. Why does the cart move forward instead of the horse moving backward? (physical concept)

Tip: The motion state of an object is determined by the resultant force on the object. The resultant force on the horse and the cart is different.

[Typical example demonstration]

(Multiple choices) As shown in the picture, "Adjia" is a popular national sport in Guangxi, my country. It is actually equivalent to a tug-of-war between two people, so it is also called "elephant tug-of-war". If A and B If person A wins in the betting game, then the following statement is correct ()

A. The pulling force of A on B is greater than the pulling force of B on A, so A wins.

B. When A pulls B over at a constant speed, the pulling force of A on B is equal to the pulling force of B on A.

C. When A accelerates and pulls B, the pulling force of A on B is greater than the pulling force of B on A.

D. The pulling force of A on B is always equal to the pulling force of B on A, but the friction force of the ground on A is greater than the friction force of the ground on B, so A wins.

[Analysis] Choose B or D. According to the concepts of action force and reaction force, it can be judged that the force of A on B and the force of B on A are action force and reaction force. According to Newton's third law, the two forces are always equal in magnitude, regardless of the state of the object. A The reason for winning is that the friction force on A is greater than the friction force on B, so the resultant force is different.

[Law method] Method of judging action force and reaction force

(1) Look at the point of action: action force and reaction force act on two objects;

(2) Look at the nature of force: action force and reaction force are generated due to interaction and must be forces of the same nature;

(3) Look at the number of force-receiving objects: there are only two force-applying objects and force-receiving objects for the two forces of action force and reaction force.

【Literacy Training】

As shown in the figure, the moment a baseball player hits the ball, when the batter hits the flying baseball back with a baseball bat, the force of the bat hitting the baseball ()

A. The ball first exerts a force on the bat, and then the bat exerts a force on the ball.

B. Produced simultaneously with the force of the ball on the bat

C. Greater than the force of the ball hitting the bat

D. Less than the force of the ball hitting the bat

【Compensation training】

An object is affected by the tension of a rope and starts to move forward from rest. It first accelerates, then changes to uniform motion, and then changes to decelerating motion. The following statement is correct ()

A. When accelerating forward, the force of the rope pulling the object is greater than the force of the object pulling the rope.

B. When decelerating and moving forward, the force of the rope pulling the object is less than the force of the object pulling the rope.

C. Only when moving forward at a constant speed, the force of the rope pulling the object is equal to the force of the object pulling the rope.

D. No matter how the object moves forward, the force of the rope pulling the object is always equal to the force of the object pulling the rope.

2. The difference between a pair of interacting forces and a pair of balancing forces

【Think·Discussion】

Situation: A little boy holds a hydrogen balloon of no mass in his hand and keeps it stationary in the air.

Discussion: (1) Which force is used to balance the tension of the rope? (scientific inquiry)

Hint: The buoyant force on the balloon.

(2) The pulling force of the rope on the balloon is the force exerted by which object on which object? (scientific inquiry)

Hint: The force of the rope on the balloon.

[Typical example demonstration]

"Weight loss" has become a current fashion topic. In order to maintain a "slim" figure, weighing has become an essential daily activity. As shown in the picture, a girl is measuring her weight. The following statement the correct one is()

A. The pressure of people on the scale and the support of the scale on people are a pair of balancing forces.

B. The gravity exerted by the person and the pressure exerted by the person on the scale are a pair of balancing forces.

C. The gravity experienced by a person and the pressure exerted by the person on the scale are a pair of action and reaction forces.

D. The pressure exerted by the person on the scale and the support force exerted by the scale on the person are a pair of action and reaction forces.

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For more information about the "Newton's Laws of Motion Newton's Third Law of Motion" PPT courseware, please click the Newton's Laws of Motion ppt Newton's Third Law of Motion ppt tag.

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Update Time: 2024-07-06

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