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science-physics

class VI

#### Key Concepts

circular motion, distance, measurement, periodic motion, rectilinear motion, SI units, units of measurement

#### essential questions

1. How can we analyze the motion of objects?
2. How do we measure distance?

#### Remembering:

1. Define motion.
2. What are the various types of motion. Give examples of each type.
3. Give two examples of periodic motion.
4. Fill in the blanks: a) motion in a straight line is called______ motion  b) Motion that repeats itself after some time is_____  c) ___ is the unit of length in SI units

#### understanding:

1. What are the precautions one has to take while taking measurements.
2. Write the difference between periodic motion and rectilinear motion.
3. In circular motion, the: a) direction of motion is fixed  b) direction of motion changes continuously  c) acceleration is zero  d) velocity is constant
4. How many seconds are there in 1 day? A)1,24,400 Seconds b) 92,400 Seconds c) 86,400 Seconds d) 64,400 Seconds
5. Convert: a) 1 Km into meter  b) 250cm in to meter  c) 25mm into meter

#### Application:

1. Think of 2 real life situations where more than two types of motions are involved. Explain in detail.
2. Consider the following statements and choose the correct one(s): a). The movement of an object is called motion b) An object is said to be in motion or moving when its position changes with time c) When the position of a car changes with time, we say that the car is moving or that the car is in motion d) All the above.
3.  One of the following types of motion will not be exhibited by the moon moving around the earth. This one is: a) Rotational motion b) Rectilinear motion c) Circular motion d) Periodic motion
4. A bicycle is moving on a straight road. Which of the following types of motion are exhibited by it? a) Periodic motion and Rotational motion b) Rotational motion and Rectilinear motion c) Rectilinear motion and Circular motion d) Periodic motion and Circular motion
5. The distance between anushka’s home and devika’s home is 1425 m. This distance is equal to: a) 14.25 km b) 142.5 km c) 1.425 km d) 0.1425 km
6. A rider on a horse falls back when horse starst running all of a suden because: a) rider is taken back  b) rider is suddenly afraid of falling   c) rider is suddenly afraid of falling  d) inertia of rest keeps the upper part of the body at rest while lower part of the body moves forward with the horse  d) Inertia of motion keeps the uper part of body at rest while lower part of the body moves forward with the horse
7. Motion of strings of a guitar shows: i) oscillatory motion  ii) vibratory motion  iii) random motion  iv) rotational motion   a) i and ii  b) i and iii  c) ii and iii  d) ii and iv
8. What causes a moving body to resist a change in its state of motion: a) its acceleration  b) speed   c) inertia  d) weight
9. One centimeter on a scale is divided into 20 equal division. The least count of tis scale will be: a) 20 cm  b) 1 mm  c) 0.1 mm   d) 0.5 mm
10. Four pieces of wooden sticks P, Q, R and S are placed along the length of 15cm long scale as shown in figure. What is the average length of these sticks  a) 2.0 cm   b) 2. cm   c) 2.6cm   d) 2.9cm
11. In a science quiz competition, Jassi was asked a question where she had to choose the statement which was/were correct?  a) When the stretched string of a sitar or guitar is plucked, it starts vibrating to and fro and shows periodic motion  b) When we strike the stretched membrane of a drum, the membrane starts vibrating (or moving up and down) by a small distance  c) Tabla or Dholak is actually a special type of periodic motion which is more commonly known as vibratory motion or oscillatory motion  d) All the above.
12.  A carpenter is fixing a certain rod on the wall by tightening a screw. How many different kinds of motion is the screw undergoing? a) Rotational motion and Random motion b) Rotational motion and Oscillatory motion c) Periodic motion and Circular motion d) Circular motion and Rectilinear motion

#### Analysis:

1. Give reasons: a) the needle of a sewing motion undergoes periodic motion  b) pulling strings of a guitar is  periodic motion
2. Why do we have standard form of measurements for length? Give reasons.
3. While measuring the length of a wooden box, the reading at one end is 1.5 cm and the other end is 4.7 cm. What is the length of the wooden box: a) 4.7 cm  b) 1.5 cm   c) 3.2 cm  d) 6.2 cm
4. Read the given statements and select the correct option: statement1: The displacement of a body may be zero, though distance can be finite. Statement2: If a body moves such that finally it arrives at initial point, the displacement is zero while displacement is zero while distance is finite.  a) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.  b) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. c) Statement 1 is true and statement 2 is false  d) Statement1 is false and statement 2 is true
5. Which of the following statement is correct: a) motion of soldiers on march past is a periodic b) motion of train along a curved track on hill is the example of curvilinear motion c) every periodic motion is also a oscillatory motion d) Hockey player running after a ball is a combined motion
6. Nidhi is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Nidhi wants to take help from you:  a)The motion which repeats itself after regular intervals of time is called periodic motion b) The revolution of earth around the sun is a periodic motion c) The revolution of moon around the earth is also a periodic motion d) None of the above
7. Study the given Venn Diagram, which of the motions described by different bodies are most likely to be I, II and III: a) I- hands of clock     II- Motion of moon around the earth  III- The blades of a fan        b) I- motion of a top   II- the wheels of a bullock cart   III- Ball moves around its center    c) I- to and fro motion of a swing   II- Hands of a clock   III- Motion of a top     d) I-Motion of skin of table    II- Child playing in a play ground  III- A flying bird
8. Two identical metal balls A and B moving in opposite directions with different speeds hit each other at point X as shown in the figure. Changes will most likely appear in their: 1. Shape   2. Volume  3. Speed  4. Direction      a) 1 and 3    b) 3and 2    c) 3and 4    d) 2 and 4
9. Consider the following statements and choose the correct one: a) One complete cycle from the point of release to the other extreme and back to the initial point is called one oscillation b) When a body moves in different direction and does not have a fixed path, it is called random motion c) An object that does not change its place or position with time, relative to its surrounding is said to be stationary or at rest d) All the above
10. Read the following sentences carefully, and choose the incorrect one: a) Transport means to carry people and goods from one place to another b) People learnt to join together plank on wood to make boats having a streamlined shape c) The invention of wheel made a great change in the modes of transport  d) In the beginning of 18th century, the invention of steam engine introduced a new source of power to run transport vehicles.