"Curve Motion" Projectile Motion PPT

Description

"Curve Motion" Projectile Motion PPT

Part One: Learning Objectives

1. Understand curved motion.

2. Study the speed direction of curved motion.

3. Explore the conditions and characteristics of objects making curved motions.

4. Analyze examples of curved motion in life.

Curved motion PPT, part 2: content analysis

Observation: the movement trajectory of an object

Curved motion: The motion trajectory is a curved motion;

Concept: trajectory, displacement

Trajectory: the path followed by a moving object

Displacement: change in position of an object

Concept: secant, tangent

Secant: A straight line passing through two points on a curve is called the secant of the curve;

Tangent line: When point B is very close to point A, this secant line is called the tangent line of the curve at point A;

Thinking: What is the relationship between the velocity direction and trajectory of an object moving in a curve at a certain moment?

Speed ​​of curved motion:

What is the direction of velocity in curved motion?

The velocity direction of the particle at a certain point (or a certain moment) is along the tangent direction of the curve at this point.

Curved motion variable speed motion:

For objects that move in a curve, the direction of the speed changes all the time, and the direction of the speed is different at different times.

Curved motion conditions:

1) Conditions:

The direction of the resultant external force and the direction of the initial velocity are not in a straight line;

The direction of acceleration and the direction of initial velocity are not in a straight line;

2) Curved motion → variable speed motion, the resultant external force is not 0:

Curved motion → speed direction change → variable speed motion;

Variable speed motion → acceleration → the resultant external force is not 0;

Linear and curved motion conditions and characteristics

linear motion

1) If the object receives no force or the net external force it experiences is zero, the object must move in a straight line at a uniform speed;

2) If the net external force on the object is not zero, but the direction of the net external force (or acceleration) is on the same straight line as the speed direction, the object will move in a variable speed linear motion;

curved motion

1) If the direction of the resultant external force (or acceleration) on the object is not on the same straight line as the direction of the velocity, the object will move in a curve;

2) Curved motion must be a variable speed motion and must have acceleration;

3) The trajectory of a curved moving object is within the range between the speed and the resultant external force, and gradually bends in the direction of the resultant external force;

Curved motion PPT, the third part: content summary

1. Curved motion is a motion with a curved trajectory.

2. Characteristics of curved motion:

The trajectory is a curve

Change of direction of movement

Variable speed motion must have acceleration, and the total external force is not zero

3. The direction of the velocity of an object moving in a curve at a certain point is the tangent direction of the curve at that point.

4. Conditions for curved motion: The direction of the resultant external force on the moving object is not in the same straight line as the direction of its speed.

Curved motion PPT, part 4: Frequently asked questions

Question group 1: Conditions and characteristics of curved motion

Question 1 [2019•Jiangsu Xuzhou High School Grade 1 Midterm] Regarding the object moving in a curve, which of the following statements is correct ()

A. The speed direction of curved motion may not change

B. The speed change movement must be a curved movement

C. Objects cannot move in curves under the action of constant force

D. To determine whether an object is moving in a curve or a straight line, you should check whether the direction of the resultant force and the direction of the speed are on the same straight line.

[Analysis] Error A: The speed direction of the curved motion always changes along the tangent direction of the trajectory.

Wrong B: When the speed changes and the direction remains unchanged, the object moves in a straight line.

C is wrong, D is right: No matter whether the net force on the object is a constant force or a variable force, as long as the force and speed are not on the same straight line, the object will move in a curve.

◆Conditions for objects to move in curves

①The initial velocity is not zero;

②The resultant force is not zero;

③The direction of the resultant force is not collinear with the direction of the speed.

Question 2 [2019·Henan Anyang Senior High School Examination] Regarding the speed of curved motion, which of the following statements is correct ()

A. The magnitude and direction of the speed change all the time

B. The magnitude of the speed changes constantly, but the direction of the speed does not necessarily change.

C. The velocity direction of a particle at a certain point is the direction of the force at that point.

D. The velocity direction of the particle at a certain point is along the tangent direction of the point on the curve.

Question 3 [2019•End of the first semester of high school in Pinggu District, Beijing] When studying the conditions for curved motion, a student did an experiment as shown in Figure 5-1-1. When the magnet is not placed, the steel ball will move in a straight line on the horizontal plane. If a magnet is placed next to the movement path of the steel ball, the steel ball will move in a curve. The experiment description ()

A. The steel ball can also perform curved motion when the resultant force on it is zero.

B. The direction of the resultant force on the steel ball and the direction of the speed are not in the same straight line, and it will move in a curve.

C. If the direction of the resultant force on the steel ball and the direction of the speed are on the same straight line, it will move in a curve.

D. If the acceleration direction and speed direction of the steel ball are on the same straight line, it will move in a curve.

Question 4 [2019•Hebei Tangshan No. 1 Middle School and Senior High School Test] The conditions for an object to move in a curve are ()

A. The total external force on the object is a constant force

B. The net external force on the object is a variable force

C. The direction of the net external force on the object and the direction of the velocity are not in the same straight line

D. The direction of the net external force on the object and the direction of acceleration are not in the same straight line.

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"Curve Motion" Projectile Motion PPT quality courseware:

"Curve Motion" Projectile Motion PPT High-Quality Courseware Part One: Core Competency Objectives Physical Concepts Know what curvilinear motion is, understand the speed direction of curvilinear motion, and understand the conditions for objects to move in curves. Scientific thinking understands that curved motion is a variable speed...

"Curve Motion" Projectile Motion PPT Excellent Courseware:

"Curved Motion" Excellent Projectile Motion PPT Courseware Part One Content: Learning Objectives 1. Be able to determine the speed direction of curved motion and know that curved motion is a variable speed motion. 2. Know the conditions for objects to make curved motion. ... .. . ... Curved Movement PPT, Part 2..

"Curve Motion" Projectile Motion PPT courseware:

"Curve Motion" Projectile Motion PPT Courseware Part One Content: Foundation of Necessary Knowledge Literacy 1. Speed ​​Direction of Curve Motion [Thinking] When an athlete throws a hammer, the moment when the athlete lets go is different. The direction of the hammer fly is different. How to determine the speed of the hammer at different moments? direction..

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Update Time: 2024-10-10

This template belongs to Physics courseware People's Education Press High School Physics Compulsory Course II industry PPT template

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