NEET Physics Chapter 1 Motion Question And Answers
Question 1. What is the difference between speed and velocity?
Answer:
Difference between speed and velocity
The distance travelled per second by a body is called speed. It is a scalar quantity. It does not tell the direction of motion. Speed is always positive and value of average speed is never zero.
While distance travelled per second by the moving object in the specified direction is called velocity. It is a vector quantity. Velocity tells us the speed as well as direction of motion. It can be positive as well as negative. The average velocity can be zero.
Question 2. Differentiate between acceleration and retardation.
Answer:
Difference between acceleration and retardation
The rate of change of velocity with respect to time is called acceleration. While decrease in velocity per unit time is called retardation.
Question 3. How uniform acceleration different than variable acceleration?
Answer: When equal change in velocity takes place in equal interval of time, then it is called uniform acceleration. If the change in velocity is not same in the same interval of time, then it is called variable acceleration.
Question 4. Define acceleration due to gravity.
Answer:
Acceleration due to gravity
When an object falls freely, the acceleration produced in the body due to Earth’s gravitational attraction is called acceleration due to gravity. It is denoted by letter g is its value is 9.8 m/s2.
Question 5. What does the slope of distance-time graph denote?
Answer:
The slope of distance-time graph denote
The slope of distance-time graph denotes the magnitude of speed.
Question 6. What does the slope of the velocity-time graph denote?
Answer:
The slope of velocity-time graph denote:
The slope of velocity-time graph denotes the magnitude of acceleration.
Question 7. What does the slope of displacement-time graph denote?
Answer:
The slope of the displacement-time graph denotes:
The slope of the displacement-time graph denotes the magnitude of velocity.
Question 8. What does the area enclosed under the velocity-time graph denote?
Answer:
The area enclosed under velocity-time graph denote:
The area enclosed under the velocity-time graph denotes the magnitude of displacement.
Question 9. Write all three equations of motion.
Answer:
There are three equations of motion.
The expression for the first equation of motion is:
v = u + at
The expression for a second equation of motion is:
S = ut + 1/2 at2
The expression for a third equation of motion is:
v2 – u2 = 2aS
Where, u = Initial velocity, v = final velocity, a = acceleration S = distance travelled
Question 10. Define uniform circular motion.
Answer:
Uniform circular motion:
If an object is moving with a velocity of constant magnitude on a circular path, then its motion is known as uniform circular motion.
Question 11. A car runs at a uniform speed of 70 km/hr from Bangalore to Mysore in 2 hours. Find the distance between two cities.
Answer: 140 km
Question 12. Rita goes to the market, which is 10 km away from her home. She travelled back 5 km in the opposite direction and stopped at the park. What is the total distance travelled and her displacement?
Answer: Displacement = 5 m Distance = 15 m
Question 13. Rahul initially at rest runs with a constant acceleration of 5 ms-2. He travels a distance of 10 m. Calculate the final velocity and time taken.
Answer: V = 10 m/s, t = 2 s
Question 14. Write all the three equations of motion.
Answer:
There are three equations of motion.
The expression for first equation of motion is:
v = u + at
The expression for second equation of motion is:
S = ut + 1/2 at2
The expression for third equation of motion is:
v2 – u2 = 2aS
Where, u = Initial velocity, v = final velocity, a = acceleration S = distance travelled
Question 15. Define uniform circular motion.
Answer:
Uniform circular motion:
If an object is moving with velocity of constant magnitude on a circular path, then its motion is known as uniform circular motion.