I. FILL IN THE BLANKS
1. We can use a _________to measure the length of a curved line.
2. A child swinging on a swing shows _________ motion.
3. Motion of a wheel of a bicycle is an example of_________motion.
4. Motion of pendulum of a clock is an example of ________ motion.
5. A _________ is used to measure the size of our chest.
II. MCQ
6. A ball rolling on the ground possesses
a) rectilinear motion b) rotational motion c) both a and b d) none of these
7.Motion of the needle of a sewing machine is
a) rectilinear b) circular c) periodic d) all of these
8. March past of soldiers in a parade is an example of
a) rectilinear b) circular c) periodic d) all of these
9. The motion of strings of a guitar is
a) rectilinear b) circular c) periodic d) all of these
10. The motion of a spinning top is linear motion
a) true b) false c) may be true or false d) none of these
III. ANSWER THE FOLLOWING:
11. Define motion
12. What is rectilinear motion? Give two examples.
13. How will you measure the length of a curved line? Explain with a diagram.
14. Give two examples of circular motion.
15. Differentiate between periodic motion and circular motion.
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Answers
Fill in the blanks:
1) thread
2) periodic
3) circular
4) periodic
5) measuring tape
Multiple Choice Questions:
1) rotational motion
2) periodic motion
3) rectilinear motion
4) periodic motion (simple harmonic motion)
5) false
Answer The Following:
1) Motion, in physics, change with time of the position or orientation of a body. Motion along a line or a curve is called translation. ... In both cases all points in the body have the same velocity (directed speed) and the same acceleration (time rate of change of velocity).
2) When we require only one co-ordinate axis along with time to describe the motion of a particle it is said to be in linear motion or rectilinear motion. Some examples of linear motion are a parade of soldiers, a train moving along a straight line, and many more.
Example-Kids sliding down from a slide is a rectilinear motion.The motion of planes in the sky is a rectilinear motion.
3) Measuring Length of a Curved line
Measuring Length of a Curved lineA curved line or surface cannot be measured by a straight scale, a measuring tape or thread must be used instead.To measure a curved line using a thread, follow the below steps:
Measuring Length of a Curved lineA curved line or surface cannot be measured by a straight scale, a measuring tape or thread must be used instead.To measure a curved line using a thread, follow the below steps:Tie a knot at one end of the thread.Place the thread at the beginning of the line and try to measure a small initial portion of the line which is relatively straight.Place your thumb at the other end of the measured portion and measure next straighter portion.Repeat the above step till the end of line is reached. Make a knot at the end of the line.Now, straighten the thread and measure the length of the two knots on a scale.
4) Giant wheel and ceiling fans are example of circular motion.
5) an object moving in periodic motion must move under the influence of a varying force which is directed to some equilibrium position or to some neutral position. In uniform circular motion this position is the center of the circle.
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