6. Teena is trying to measure the length of a pencil using a broken scale. The reading at the one end of the scale is 4 cm and the other end is 11.8 cm. How can you help her to find out the exact measurement of the pencil?
7. ‘‘All periodic motions are not oscillatory motion but all oscillatory motion are periodic’’. Do you agree to this statement? Justify your answer.
8. Riya is coming home from school on her bicycle. What are the different types of motion
shown by Riya and the bicycle?
9. Can a body be in translatory and rotational motion together? Explain your answer with an example.
10. Differentiate between motion and rest.
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6. If the edge of the scale is worn out or the zero mark is not clearly visible, then we should start measuring
from next clear full mark. Also subtract the reading of this mark from the reading at the other end. So
while measuring the length of the pencil, Teena should subtract 4 cm from 11.8 cm.
So the length of the pencil is 7.8 cm
7. Yes I agree to this statement. Periodic motions are the motions that repeats at equal interval of time. It need not be an oscillatory motion. But oscillatory motions are the type of motion when the object moves in a to and fro direction from the original position of rest. In oscillatory motion the object always repeats its motion at equal interval of time. Therefore, all periodic motions are not oscillatory motion but all oscillatory motion are periodic.
8. Riya and the bicycle are showing translatory motion, the handles are showing oscillatory motion and the wheels are showing rotational motion at the same time.
9. Yes, a body can be in translatory and rotational motion together. For example a moving screw driver is showing translatory motion and rotational motion at the same time.
10. If an object changes its position with respect to the stationary objects or object at rest around it, it is said to be in motion. If the object does not change its position with respect to the stationary objects around it or if the moving object stops moving, it is said to be at rest.
Hope it helps you dear
7. Yes I agree to this statement. Periodic motions are the motions that repeats at equal interval of time. It need not be an oscillatory motion. But oscillatory motions are the type of motion when the object moves in a to and fro direction from the original position of rest. In oscillatory motion the object always repeats its motion at equal interval of time. Therefore, all periodic motions are not oscillatory motion but all oscillatory motion are periodic.
8. Riya and the bicycle are showing translatory motion, the handles are showing oscillatory motion and the wheels are showing rotational motion at the same time.
9. Yes, a body can be in translatory and rotational motion together. For example a moving screw driver is showing translatory motion and rotational motion at the same time.
10. If an object changes its position with respect to the stationary objects or object at rest around it, it is said to be in motion. If the object does not change its position with respect to the stationary objects around it or if the moving object stops moving, it is said to be at rest.
Hope it helps you dear
Never mind dear
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