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Questions and Answers
What is the conversion of 1 meter in millimeters?
What is the conversion of 1 meter in millimeters?
- 10 mm
- 100 mm
- 1000 mm (correct)
- 500 mm
What is the scale used for drawing the map between Kota and Delhi?
What is the scale used for drawing the map between Kota and Delhi?
- 1 mm = 700 m
- 1 mm = 7 m
- 1 mm = 7000 m (correct)
- 1 mm = 70000 m
What is the actual distance between Kota and Delhi?
What is the actual distance between Kota and Delhi?
- 49000 m
- 490000 m (correct)
- 4900 m
- 490 m
What is the characteristic of distance that it never decreases with time?
What is the characteristic of distance that it never decreases with time?
What does the odometer of a vehicle measure?
What does the odometer of a vehicle measure?
What is the unit of distance in the C.G.S system?
What is the unit of distance in the C.G.S system?
What is the path that represents the distance covered by a particle?
What is the path that represents the distance covered by a particle?
What type of motion is exhibited by a car or cycle wheel?
What type of motion is exhibited by a car or cycle wheel?
What is the term used to describe the motion of an object that moves to and fro about its mean position?
What is the term used to describe the motion of an object that moves to and fro about its mean position?
What is the distance between Kota and Delhi in km?
What is the distance between Kota and Delhi in km?
What is the motion of a wheel also called?
What is the motion of a wheel also called?
What type of motion does the Earth exhibit in its revolution around the Sun?
What type of motion does the Earth exhibit in its revolution around the Sun?
What is the perimeter of the rectangular path traversed by the dog?
What is the perimeter of the rectangular path traversed by the dog?
What is the term used to describe a motion that occurs when an object moves in a repeated pattern over equal periods of time?
What is the term used to describe a motion that occurs when an object moves in a repeated pattern over equal periods of time?
What is the motion of a vibrating stretched string an example of?
What is the motion of a vibrating stretched string an example of?
What is the displacement of the dog after completing one round of the rectangular path?
What is the displacement of the dog after completing one round of the rectangular path?
What is the radius of the curved path traversed by the object?
What is the radius of the curved path traversed by the object?
What is the term used to describe the motion of an object that oscillates very fast?
What is the term used to describe the motion of an object that oscillates very fast?
What is the time taken by the object to move from A to B?
What is the time taken by the object to move from A to B?
What type of motion does a girl swinging on a swing exhibit?
What type of motion does a girl swinging on a swing exhibit?
What is the distance travelled by the object in moving from A to B?
What is the distance travelled by the object in moving from A to B?
What is the value of π used in the problem?
What is the value of π used in the problem?
What is the unit of speed in the C.G.S system?
What is the unit of speed in the C.G.S system?
What is the speed of the bus in km/hr if it travels 54 km in 90 minutes?
What is the speed of the bus in km/hr if it travels 54 km in 90 minutes?
What is the significance of speed in motion?
What is the significance of speed in motion?
What is the conversion of 1 km/h to m/s?
What is the conversion of 1 km/h to m/s?
What is the speed of the bus in m/s if it travels at 36 km/hr?
What is the speed of the bus in m/s if it travels at 36 km/hr?
What happens to the speed of an object when it is at rest?
What happens to the speed of an object when it is at rest?
What is the unit of speed in the S.I system?
What is the unit of speed in the S.I system?
Can speed be negative?
Can speed be negative?
What happens to distance and displacement when a particle changes its direction or follows a curved path?
What happens to distance and displacement when a particle changes its direction or follows a curved path?
What is true when an object is in uniform motion?
What is true when an object is in uniform motion?
What is represented on a number line?
What is represented on a number line?
What is denoted by –Z?
What is denoted by –Z?
What is true about the representation of integers on a number line?
What is true about the representation of integers on a number line?
What is the relationship between two integers on a horizontal number line?
What is the relationship between two integers on a horizontal number line?
What is denoted by Z or I?
What is denoted by Z or I?
What is the symbol commonly used to denote distance and displacement in numerical problems?
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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