Municipal educational institution secondary school No. 31, Krasnodar

PLAN-OUTLINE

PHYSICS LESSON IN 9TH GRADE

Conducted by: teacher of the highest category

Tarasova Olga Anatolyevna

November 2010

Krasnodar city

2010-2011 academic year.

Lesson type : lesson of generalization, systematization, updating of basic knowledge.

Lesson type : combined.

Methodological goal : systematization of knowledge on the topic, solving problems (graphical and combined) at the final stage of the lesson.

Goals and objectives:

Repeat the formulas and definitions of the topic “Uniform and uniformly accelerated motion”;

Improve skills in solving problems of various types (qualitative, graphic, analytical);

To form an idea of ​​the structure and relationship between physical theory and practice;

Cultivate interest in the subject.

LESSON PLAN:

	Lesson stage	Kind of activity	Time
	Organizing time	Conversation	2 minutes
	Repetition of the theory	Frontal survey	15 minutes
	Updating what has been learned	Problem solving	2 0 min
	Summing up the lesson	Conversation	3 min

Organizing time: setting goals and objectives for the lesson, preparing for the test.

Repetition of the theory of the topic “Uniform and uniformly accelerated rectilinear motion”

repetition of definitions (frontal survey based on presentation - slide No. 1-5): body coordinates, path and displacement, speed and acceleration, types of motion: uniform and uniform motion.

Repetition of formulas by types of movement (conversation based on presentation - slide No. 4-7)

Repetition of movement graphs (conversation based on presentation-slide No. 8-10)

Updating the studied material:

Solving quality problems :

Can the modulus of displacement of a body be equal to the length of the path traveled by it? Explain your answer.

You have to travel the same distance by boat back and forth: the first time along the river, the second time in still water. Will it take the same amount of time in both cases?

Under what conditions does a body move with constant acceleration?

Solving combined problems (including graphic ones) :

Describe the nature of the body’s motion and determine the quantities that characterize the body’s motion according to the equation of its motion

(slide 11,12).

Using the graph showing the dependence of the speed of a body on time, write down the equation for the dependence of speed on time (slide 13.14).

Solution of the analytical problem:

№ 86 –A.P. Rymkevich.

(Answer: 10s; 40m; 45m; 120m)

Summing up the lesson : analysis of problem solving, grading.

Homework: prepare for the test, No. 16,23,75 - Rymkevich A.P. "Collection of problems in physics"

Literature:

1)A.V. Peryshkin, E.M. Gutnik “Physics – 9”, Moscow: Bustard 2009.

2) A.P. Rymkevich “Collection of problems in physics”, Publishing house “Prosveshcheniye”

3) E.S. Eryutkin, S.G. Eryutkina, V.G. Pikes “Didactic materials in physics 9” Arkti Publishing House, Moscow 2000

4) A.I.Nurminsky, I.I.Nurminsky, N.V. Nurminskaya, “Unified State Examination: step by step”, Moscow “Drofa” 2011.

5) Physics, 9th grade: Lesson plans based on the textbook by A.V. Peryshkina, E.M. Gutnik / author S.V. Bobrova. - Volgograd: Teacher, 2005 /.

Uniformly accelerated motion. Acceleration.* Uniformly accelerated
movement.
What is acceleration?
Acceleration.
Physics teacher Fedorov
Alexander
Mikhailovich Municipal Educational Institution Kyukyai Secondary School
Suntarsky ulus Republic of Sakha

In case of uneven movement, determine the movement of the body along
formula
no longer possible because the speed is
S = V*t
different
places of the trajectory and in different
moments
time is different.
How to determine the movement of a body, and therefore its
coordinates for uneven movement?
We will use the concept of “instantaneous speed”.
The instantaneous speed of a body is the speed of the body at a given
moment in time or at a given point in the trajectory.
For simplicity, we will consider such an uneven
movement in which the speed of the body for each unit
time changes equally, i.e. uniformly accelerated
movement.
To characterize the rate of change of speed, enter
physical quantity – acceleration. Denoted by the letter a.

If at the initial moment of time the body already had some
speed V0, then the change in speed is V - V0, and for acceleration
the formula is:
a = (v – v0)/t.

a value equal to the ratio of the change in speed to the interval
the time during which this change occurred.
Acceleration is a vector quantity. She has the same
direction, as well as change in speed. Per unit acceleration in
The International System of Units accepts this acceleration
rectilinearly and uniformly accelerated moving point, with
in which in 1 s its speed changes by 1 m/s. This unit
acceleration is written as follows: 1 m/s2

Uniformly accelerated motion is motion with constant
acceleration.
Speed ​​at throttle: by definition
a = (v – v0)/t.
Where does it come from:
v = v0 + a t
The resulting expression is called the throttle velocity equation.
If v0 = 0, then the formula takes the form:
v = a t
Let us write down the equations for the projections of vectors onto the coordinate axis:
vx= v0x+ ax ·t ,
vx=ax ·t
,

When moving with increasing speed, the vectors v, v0 and a
co-directed

When braking, vector a is directed opposite to the vectors
v and v0

Graphical representation of speed
vx
vx
0
t
1
vx
0
t
2
0
3
t
1 – for the case v0 =0, 2 - v0 >0 the body moves with increasing
speed, 3 – movement slows down until it stops.

So, we have studied what RUD is 1. movement in which the speed of the body for each unit
time changes the same.
2. What is acceleration a = (v – v0)/t.
The acceleration of a body during its uniformly accelerated motion is called
a value equal to the ratio of the change in speed to
the period of time during which this change occurred.
3. We derived the equation for the thruster speed: v = v0 + a ·t

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Uniformly accelerated motion is a motion in which the speed of a body changes equally over equal periods of time.

Acceleration is a quantity equal to the ratio of the change in speed to the period of time during which this change occurred.

S x

S x

Task No. 1. With what acceleration does a racing car move if its speed increases from 144 to 216 km/h in 6 s?

Problem No. 2 How long will it take the rocket to reach its first escape velocity of 7.9 km/s if it moves with an acceleration of 50 m/s 2 ?

Task No. 3 Calculate the length of the runway if the plane's speed is 300 km/h and the acceleration time is 40 s.

Task No. 4

The speed of the racing car at the start of acceleration is 10 m/s, acceleration 5 m/s 2 . Determine the distance traveled by the car in 10 s after the start of movement. What is the speed of the car at the end of the tenth second of acceleration?

Problem No. 5 The braking distance of a car moving at a speed of 50 km/h is 10 m. What is the braking distance of the same car at a speed of 100 km/h?

Problem No. 6 What is the length of the plane's run when landing if its landing speed is 140 km/h and the acceleration during braking is 2 m/s 2 ?

Problem No. 7 With uniformly accelerated motion with an initial speed of 5 m/s, the body traveled 20 m in 3 s. With what acceleration did the body move? What is its speed at the end of the third second?