Lesson plan for 10th grade physics Uniform motin. + problems

Class

10^th grade

Date

Lesson

Physics

Period

1 hour

Subject

</<span>Uniform motion

Aim

To study Uniform motion

Materials

Mechanics

Methods and Techniques

Explaining, solving exercises

General Review of Previous Lesson :

Ask a few questions about last topic as : Uniform motion

The following equations of kinematics are used to

define uniformly accelerated motion:

where

a is the constant acceleration

v₀ is the initial velocity

v is the final velocity

x is the displacement

t is the time

The change in the position of an object is called the displacement which is also a vector quantity.

Displacement is defined by where is the position vector at time and is the position vector at time

1. Two automobiles are 150 kilometers apart and traveling toward each other. One automobile

is moving at 60 km/h and the other is moving at 40 km/h mph. In how many hours will they

meet? (1.5)

2. A car travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers atan average speed of 40 km/h. The average speed of the car for this 80-km trip is: (53 km/h)

3. In astronomy the light-year is used as a unit of distance. It is the distance that light can travel in one year. (For instance, our galaxy, the Milky Way, is about 150 000 light-years across). If light travels at a constant speed of 300 000 km/s, Calculate 1 light-year in km?

4.A car moving with an initial velocity of 25 m/s north has a constant acceleration of 3 m/s² south. After 6 seconds its velocity will be:

5.A car, initially at rest, travels 20 m in 4 s along a straight line with constant acceleration. The acceleration of the car is: 2.5m/s²

Evaluation:

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