Questions and Answers
What is the conversion of 1 meter in millimeters?
1000 mm
What is the scale used for drawing the map between Kota and Delhi?
1 mm = 7000 m
What is the actual distance between Kota and Delhi?
490000 m
What is the characteristic of distance that it never decreases with time?
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What does the odometer of a vehicle measure?
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What is the unit of distance in the C.G.S system?
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What is the path that represents the distance covered by a particle?
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What type of motion is exhibited by a car or cycle wheel?
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What is the term used to describe the motion of an object that moves to and fro about its mean position?
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What is the distance between Kota and Delhi in km?
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What is the motion of a wheel also called?
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What type of motion does the Earth exhibit in its revolution around the Sun?
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What is the perimeter of the rectangular path traversed by the dog?
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What is the term used to describe a motion that occurs when an object moves in a repeated pattern over equal periods of time?
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What is the motion of a vibrating stretched string an example of?
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What is the displacement of the dog after completing one round of the rectangular path?
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What is the radius of the curved path traversed by the object?
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What is the term used to describe the motion of an object that oscillates very fast?
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What is the time taken by the object to move from A to B?
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What type of motion does a girl swinging on a swing exhibit?
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What is the distance travelled by the object in moving from A to B?
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What is the value of π used in the problem?
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What is the unit of speed in the C.G.S system?
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What is the speed of the bus in km/hr if it travels 54 km in 90 minutes?
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What is the significance of speed in motion?
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What is the conversion of 1 km/h to m/s?
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What is the speed of the bus in m/s if it travels at 36 km/hr?
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What happens to the speed of an object when it is at rest?
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What is the unit of speed in the S.I system?
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Can speed be negative?
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What happens to distance and displacement when a particle changes its direction or follows a curved path?
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What is true when an object is in uniform motion?
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What is represented on a number line?
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What is denoted by –Z?
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What is true about the representation of integers on a number line?
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What is the relationship between two integers on a horizontal number line?
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What is denoted by Z or I?
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What is the symbol commonly used to denote distance and displacement in numerical problems?
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Study Notes
Motion
- Motion of a car or cycle wheels is a combination of translational and rotational motion.
- Rotational motion is also called 'rolling motion'.
Periodic Motion
- A motion that occurs when an object moves in a repeated pattern (a cycle) over equal periods of time is called a periodic motion.
- Examples: motion of a pendulum, rotational motion of Earth, revolution of Earth around the Sun.
Oscillatory Motion
- A motion that occurs when an object moves to and fro about its mean position over equal periods of time is called an oscillatory motion or vibratory motion.
- Examples: motion of a simple pendulum, motion of a vibrating stretched string, motion of an oscillating spring.
- The term 'vibratory motion' is used when an object oscillates very fast.
Distance
- Distance is the length of the actual path between initial and final positions of a particle.
- Distance is a scalar quantity.
- Distance depends on the path.
- Distance never decreases with time.
- Distance is always taken positive.
- Unit: C.G.S. system - centimeter (cm); S.I. system - metre (m).
- Odometer of a vehicle measures the distance.
- Distance is greater than displacement on a curved path.
- Distance is exactly equal to displacement when it follows a straight path without changing its direction.
Displacement
- Displacement is the shortest distance between initial and final positions of a particle.
- Displacement can be negative.
- Unit: same as distance.
Number Line
- Integers can be represented on a number line.
- The number line shows that every integer has an opposite number except '0'.
- The numbers +1, +2, +3..... are positive numbers, denoted by +Z.
- The numbers –1, –2, –3..... are negative numbers, denoted by –Z.
- The positive and negative integers together with 0 are integers, denoted by Z or I.
Speed
- Speed gives no idea about the direction of motion of the object.
- Speed can never be negative; in motion, it is taken positive; at rest, it is zero.
- Unit: C.G.S. system - centimeter/second (cm/s); S.I. system - metre/second (m/s).
- 1 km/h = 5/18 m/s.
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