Class 11 Physics
Motion In A Straight Line
Question 1.
What do you understand by “uniform motion” and “non-uniform motion”?
Question 2.
What do you understand by the terms “average velocity” and “average speed”?
Question 3.
A bus is moving along a straight line. It moves from point A to point B in 15s and return from point B to point A in 5.0s. Calculate: the average velocity and average speed of the car in going from A to B? (Distance between point A and point B is 450m.)
Question 4.
Define: Instantaneous velocity.
Question 5.
The position of an object moving along x-axis is given by: x=b+ct2; where a=9.0m., b=4.5ms-2and t is measured in seconds. What is its velocity at t=0s and t=3.0s. What is the average velocity between t=3.0s and t=6.0s?
Question 6.
A ball thrown vertically upwards with a velocity of 15ms-1 from the top of a complex. The height of the point from where the ball is thrown is 30.0m. from the ground. How high will the ball rise?
Question 7.
Two parallel rail tracks run north-south. Train P moves north with a speed of 63kmh-1, Q moves south with a speed of 81kmh-1. What is the
Question 8.
How do you define “average acceleration”?
Question 9.
A car moving along a straight highway with speed of 159kmh-1 is brought to a stop within a distance of 300m. What is the retardation of the car (assumed uniform), and how long does it take for the car to stop?
Question 10.
Megha starts from her home at 11:00 AM, walks with a speed of 4kmh-1 on a straight road up to the market 2.0km away, visited market up to 3:00PM, and returns home by a cab with a speed of 30kmh-1. Choose the suitable scales and plot x-t graph of her motion.
Question 11.
What are the dimensions and units for “path length” and “displacement”?
Question 12.
Write down the three kinematic equations of motion.
Question 13.
Differentiate between “path length” and “displacement”.
Question 14.
In which case, the average velocity and the average speed of an object would be the same?
Question 15.
Does the zero velocity of a particle at any instant necessarily imply zero acceleration?
Question 16.
A jet airplane travelling at the speed of 600kmh-1 ejects its products of combustion at the speed of 1800kmh-1 relative to the jet plane. What is the speed of the latter with respect to an observer on the ground?
Question 17.
A ball is dropped from a height of 80m. on a floor. At each collision with the floor, the ball loses one-eighth of its speed. Plot the speed-time graph of its motion between t=0 to 11s.
Question 18.
Explain with example that how the magnitude of displacement may or may not be equal to the path length traversed by an object.
Question 19.
Anil standing on a stationary lift (open from above) throws a ball upwards with the maximum initial speed he can, equal to 55ms-1. How much time the ball takes to return to his hands?
Question 20.
A person walking in a narrow lane takes 3 steps forward and 2 steps backward, followed again by 3 steps forward and 2 steps backward, and so on. Each step is 1m. long and requires 1 s. Plot x-t graph of his motion. Determine graphically and otherwise how long the man takes to reach a wall 5m. away from the start.
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All About Daily Practice Problems on Class 11 Physics Motion In A Straight Line NCERT Chapter 3
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