Motion and Types of Motion Q & A
Q.1. Identify the types of motion.
(a) Movement of the earth around the sun: Periodic motion.
(b) Movement of ceiling fan: Circular motion.
(c) A rocket launched from the ground: Linear motion.
(d) A fish swimming in water: Random motion.
(e) The plucked string of a sitar: Oscillatory motion.
Q.2. Fill in the blanks.
(linear, non-linear, uniform linear, non-uniform linear, uniform circular, random, circular, non-uniform circular)
(a) If a ball is released from the terrace of a building, it comes down in uniform linear motion. On the other hand, it reaches the ground in non-uniform linear motion if it is thrown with a force away from the terrace in a direction parallel to the terrace.
(b) The motion of an aeroplane on the runway before take off is linear .
(c) The kite looking for its prey flies with circular motion in the sky.
(d) Children sitting in a rotating giant wheel have uniform circular motion, while those sitting in a merry-go-round have a non-uniform circular motion.
(Linear, non-linear, uniform linear, non-uniform linear, uniform circular, random, circular, non-uniform circular)
Q.3. How are we different?.
(a) Oscillatory motion and Linear motion.
Ans: In oscillatory motion, body swings back and forth like Motion of a swing or motion of pendulum of a clock but in linear motion, an object shows displacement in a straight line like a train in motion or motion of soldiers on a parade.
(b) Linear motion and Random motion.
Ans: Motion in a straight line is called linear motion and the motion that changes its direction and speed continuously is called random motion.
(c) Random motion and Oscillatory motion
Ans: The motion that changes its direction and speed continuously is called random motion and the motion of a body that is swinging back and forth is called oscillatory motion.
Q.4. Explain in your own words, giving one example each.
(a) Linear motion
Ans: An object that shows displacement along a straight line is called linear motion.
(b) Oscillatory motion
Ans: The motion of a body swinging back and forth like a pendulum of a clock is called oscillatory motion.
(c) Circular motion
Ans: The motion of an object along a circular path like a ceiling fan is called circular motion.
(d) Random motion
Ans: The motion that changes its direction and speed continuously is called random motion.
(e) Periodic motion
Ans: The motion of an object which passes through a certain point again and again after a fixed period is called as periodic motion.
Q.5. Answer the following questions in your own words.
(a) Which types of motion are seen in birds flying in the sky?
Ans: The birds flying in the sky exhibit random motion and their wings show oscillatory motion.
(b) Write in detail about your experience of various types of motion while riding a bicycle on a road.
Ans:
- The bicycle itself shows linear motion.
- The wheels of the bicycle show circular motion.
- The bicycle chain shows periodic motion, if the speed is uniform.
- The handle bar shows random motion.
Q.6. Complete the puzzle using words for types of motion:
(1) A spring is stretched and one end is released.
Ans: Oscillatory
(2) A minute hand.
Ans: Circular
(3) A see-saw.
Ans: Periodic
(4) Children in a march past.
Ans: Linear
(6) A stone rolling down a hillside.
Ans: Random