"Centripetal Acceleration" Circular Motion PPT

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"Centripetal Acceleration" Circular Motion PPT

Part One: Learning Objectives

1. Know that uniform circular motion is a variable-speed motion with acceleration directed toward the center of the circle - centripetal acceleration.

2. Know the expression of centripetal acceleration, be able to choose the appropriate expression of centripetal acceleration according to the problem situation, and be able to use it to perform simple calculations.

3. Be able to use vector diagrams to represent the relationship between velocity change and velocity, and understand the difference between acceleration, speed, and velocity change.

4. Understand the analysis method of the centripetal acceleration direction of uniform circular motion.

5. Know the direction and formula of centripetal acceleration of variable speed circular motion.

Centripetal acceleration PPT, part 2: content analysis

How many forces act on the ball?

In what direction does the resultant force of these forces follow?

The ball is affected by gravity, the support of the table and the pull of the rope.

The gravity and support forces cancel each other out, and the resultant force is the tension of the rope, pointing along the rope towards the center of the circle.

According to Newton's second quantification, the direction of acceleration of a moving object is the same as the direction of the resultant external force.

The acceleration of an object in uniform circular motion points toward the center of the circle. This acceleration is called centripetal acceleration.

1. The direction points to the center of the circle

2. Meaning: a physical quantity that reflects the speed of change in speed direction.

According to Newton's second law, combined with the expression of centripetal force learned in the previous section, the expression of centripetal acceleration is derived:

1. Centripetal acceleration of uniform circular motion:

2. Use ω and r to represent centripetal acceleration:

3. Please use v and ω to express centripetal acceleration:

4. Please use T and r to express the centripetal acceleration:

5. Please use n ( f ) and r to express the centripetal acceleration:

Centripetal acceleration PPT, part 3: Frequently asked questions

Question Group 1: Understanding Centripetal Acceleration

Question 1 [2019•Yunnan Yuxi No. 1 Middle School and Senior High School Test] Which of the following statements about centripetal acceleration is correct ()

A. Centripetal acceleration indicates how quickly the velocity of an object in circular motion changes.

B. Centripetal acceleration represents the speed of change of angular velocity

C. The centripetal acceleration of uniform circular motion remains unchanged.

D. As long as it is circular motion, its acceleration remains unchanged.

[Analysis] There are two situations of circular motion: one is uniform circular motion, and the other is non-uniform circular motion. In uniform circular motion, the direction of acceleration points to the center of the circle, which is called centripetal acceleration (the magnitude remains unchanged, but the direction changes all the time); in non-uniform circular motion, acceleration can be decomposed into centripetal acceleration and tangential acceleration. Acceleration in circular motion is a physical quantity that reflects the speed of speed change, so option C is correct.

Question 2 [Multiple Choice] Regarding circular motion, which of the following statements is correct ()

A. When an object makes uniform circular motion, the centripetal acceleration is the total acceleration of the object.

B. When an object makes circular motion, the centripetal acceleration is the total acceleration of the object.

C. When an object moves in a circle, the direction of acceleration always points to the center of the circle.

D. When an object moves in a uniform circular motion, the direction of acceleration always points to the center of the circle.

Question 3 [2019•Shandong Yantai Simulation] As shown in the figure, a sphere with a radius R rotates uniformly around the axis O1O2 at an angular speed ω. A and B are two points on the sphere. Which of the following statements is correct ()

A. Two points A and B have the same angular velocity

B. Two points A and B have the same linear speed.

C. Two points A and B have the same centripetal acceleration.

D. The centripetal acceleration directions of points A and B both point to the center of the sphere.

Question 4 [2019·Fujian Normal University High School Affiliated Senior High School Final] Swinging is a favorite sport for children. When the swing reaches the highest point, the child’s acceleration direction is () in the picture

A.a direction B.b direction

C.c direction D.d direction

Question 5 As shown in the figure, one end of the light rope is tied to a small ball, and the other end is fixed at point O. Dice a nail at point P directly below point O, so that the suspension line is tightened to form an angle θ with the vertical direction, and then The ball is released from rest, when the suspension line hits the nail ()

A. The instantaneous speed of the ball suddenly increases

B. The angular velocity of the ball suddenly decreases

C. The tension on the rope suddenly decreases

D. The acceleration of the ball suddenly increases

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For more information about the "Circular Motion Centripetal Acceleration" PPT courseware, please click the Circular Motion PPT Centripetal Acceleration PPT tag.

"Centripetal Acceleration" Circular Motion PPT high-quality courseware:

"Centripetal Acceleration" Circular Motion PPT Premium Courseware Part One: Core Competency Objectives Physical Concepts Centripetal acceleration and its direction, the relationship between centripetal acceleration and linear velocity, and the relationship between centripetal acceleration and angular velocity. Scientific thinking Able to use centripetal acceleration..

"Centripetal Acceleration" Circular Motion PPT Excellent Courseware:

"Centripetal Acceleration" Circular Motion PPT Excellent Courseware Part One Content: Learning Objectives 1. Understand the concept of centripetal acceleration. 2. Know the relationship between centripetal acceleration, linear velocity, and angular velocity. 3. Be able to use the centripetal acceleration formula to solve related problems question. ... ... ...

"Centripetal Acceleration" Circular Motion PPT Courseware:

"Centripetal Acceleration" Circular Motion PPT Courseware Part One Content: Foundation for Necessary Knowledge Literacy [Thinking] When a ball makes uniform circular motion around one end of a rope, what is the direction of its acceleration? How to calculate its size? Does its speed change? Tips: The direction of acceleration refers to...

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Update Time: 2024-10-19

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