D. Short Answer Type Questions
1. What is the metric system of units?
2. What are fundamental quantities? Name them.
3. Differentiate between the CGS and the MKS systems of units.
4. What is an oscillatory motion? Give examples.
5. Give at least four examples where an object has multiple motions.
E. Long Answer Type Questions
1. What are SI units?
2. How will you measure the length of a curved line by using a thread?
3. What is translatory motion? Define it giving its types and examples.
4. Describe the motion of a ball rolling from an inclined plane.
5. Define periodic and nonperiodic motions, giving their examples.
F. HOTS Questions
1. What are multiples and submultiples of a unit? Write their uses.
2. What would happen if the earth were moving with rotatory motion only?
3. How would a drill machine work if it had only rotatory motion?
Answers
Answer - motion which repeats itself at regular intervals of time is called a periodic motion.
.a motion which repeats itself but not at regular intervals of time is called a
non-periodic motion
1) International unit of systems
3) there are two types of traslatary motion are
a.rectilinear motion
b.curvilinear motion
short type question answer :
2) fundamental quantities are those physical quantities that cannot be expressed in internal other quantities it is independent on its own for example mass length time temperature electric...
hots Q
1) multiple and submultiple are the prefix and suffix that we frequently used to express .
4) what is oscillatory motion give examples
Q)oscillatory motion is defined as the to and fro motion of the body about its fixed position oscillatory motion is the type of periodic motion..
example- oscillatory motion are the grating springs swinging of the swings etc
D. Short Answer Type Questions
1. What is the metric system of units?
The metric system uses units such as meter, liter, and gram to measure length, liquid volume, and mass, just as the U.S. customary system uses feet, quarts, and ounces to measure these.
2. What are fundamental quantities? Name them.
Fundamental quantities are those physical quantities that cannot be expressed in terms other quantities. It is independent on its own. For example: Mass, Length, time, temperature, electric current.
3. Differentiate between the CGS and the MKS systems of units.
- CGS system stands for centimeter-gram -second and it was used in earlier days where length was represented by centimeter , mass by grams and time by seconds.
- MKS stands for meter kilogram seconds, where length was measured in meter and mass in kilograms and time in seconds.
4. What is an oscillatory motion? Give examples.
Oscillatory motion is defined as the to and fro motion of the body about its fixed position. Oscillatory motion is a type of periodic motion. Examples of oscillatory motion are vibrating strings, swinging of the swing etc.
5. Give at least four examples where an object has multiple motions.
Four examples where an object has multiple motions :-
1) A vehicle moving show both rotatory and translatory motion.
2) A man driving a bicycle shows both rotatory and translatory motion.
3) The drill used by a Carpenter shows both rotatory and translatory motion.
4) A pulley shows both rotatory and translatory motion.
E. Long Answer Type Questions
1. What are SI units?
A system of physical units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten.
2. How will you measure the length of a curved line by using a thread?
A 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.
3. What is translatory motion? Define it giving its types and examples.
When a force acts on a stationary and rigid body, which is free to move, the body starts moving in a straight path in the direction of force. This type motion is called translation motion. Example: When you pusing a ball which is lying on a floor, it begans to move.
4. Describe the motion of a ball rolling from an inclined plane.
The motion of the ball is like the velocity of the ball increases. This is due to the ball accelerating as it travels farther down the inclined plane. There is constant acceleration, meaning that speed constantly increases per second.
5. Define periodic and nonperiodic motions, giving their examples.
Periodic motion, motion repeated in equal intervals of time. Periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave.
Non Periodic Motion. The name itself implies that this type of motion does not repeat itself after a fixed time interval. Even though the motion of a body repeats, it can be non-periodic motion if it does not have a fixed time for repetition. For example, Swaying of the branches of a tree. Motion of a bouncing ball under the action of gravity and friction, the running of a batsman between the wickets.
F. HOTS Questions
2. What would happen if the earth were moving with rotatory motion only?
If the Earth stopped spinning suddenly, the atmosphere would still be in motion with the Earth's original 1100 mile per hour rotation speed at the equator. All of the land masses would be scoured clean of anything not attached to bedrock.
3. How would a drill machine work if it had only rotatory motion?
A drill has a complimentary cutting surface which makes the drill helical in shape and the drill machine having both translatory and rotatory motion. Now if onle the rotatory motion was present then had to put extra force on the drill machine and it sometimes might not makes the holes as we want them to. This will happen because of the reduced efficiency of the drill machine on removal of the translatory motion.