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Can a body have constant speed and still be accelerating?
What is the nature of the displacement-time graph of a body moving with constant acceleration?
Can the speed of a body be negative?
What does the slope of a velocity – time graph represent?
Can the distance travelled by a particle be zero when displacement is not zero?
Give Reasons for the Following:
In a long distance race, the athletes were expected to take four rounds of the track such that the line of finish was same as the line of start. The motion of the athlete is non-uniform. Why?
If the reading on the odometer of a vehicle in the beginning of a trip and after 40 minutes were 1048 km and 1096 km respectively, will the reading on the speedometer show this velocity where the vehicle is moving? Support your answer with reason.
Can a body move with constant acceleration but with zero velocity? If yes, why?
Can a body move horizontally with acceleration in vertical direction? If yes, why?
Can a body move with a constant velocity in an accelerated motion? If yes, give reason.
Speed and velocity
Distance and displacement
Uniform and non-uniform motion
Uniform and variable velocity
Uniform and non-uniform acceleration
What do you understand by displacement-time graph? Draw a displacement-time graph for a girl going to school with uniform velocity. How can we calculate uniform velocity from it?
What is velocity-time graph? Sate how it can be used to find:
i. acceleration of a body
ii. the displacement of a body, and
iii. the distance travelled in a given time
The driver of a train travelling at 40 ms-1 applies the brakes as a train enters a station. The train slowsdown at a rate of 2 ms-2. The platform is 400 m long. Will the train stop in time?
A girl running a race accelerates at 2.5 ms-2 for the first 4 s of the race. How far does she travel in this time?
Two trains A and B of length 400 m each are moving on two parallel tracks with uniform speed of 72 kmh-1 in the same direction with A ahead of B. The driver of B decides to overtake Aand accelerate by 1 ms-2. If after 50 s, the guard of B just passes the driver of A, what was the original distance between them?
The velocity of car is 18 ms-1. Express this velocity in kmh-1.
An electric engine has a velocity of 120 kmh-1. How much distance will it travel in 30s?
A man is sitting in a train which is moving. Is he at rest or in motion?
When you return to your home from your school, what is your displacement?
When you apply brakes to a car, in which direction is its acceleration?
Which can produce more acceleration; a car or a motorcycle?
Give an example of negative acceleration from daily life situation.
The branch of Physics which deal with the motion of objects while taking into consideration the cause of motion is:
There is an argument about uniform acceleration between Mr X and Mr Y. Mr X says “acceleration means that farther you go faster you go”. Mr Y says “acceleration means that longer you go the faster you go”. Whose statement is correct?
Starting from rest at the top of an inclined plane a body reaches the bottom of the inclined plane in 4 second. In what time does the body cover one-fourth the distance starting from rest at the top?
A car travels 100 km east and then 100 km south. Finally, it comes back to the starting point by the south-east route. Throughout the journey the speed is constant at 60 kmh-1. The average velocity for the whole journey if time taken is 3.3 hours is:
The displacement of a body is proportional to the cube of the time lapsed. The magnitude of the acceleration is:
A particle accelerates from rest at a constant rate for some time and attains a constant velocity of 8 ms-1. Afterwards it decelerates with a constant rate and comes to rest. If the total time taken is 4 second, the distance travelled is:
A body moves on three quarters of a circle of radius r. The displacement and distance travelled by it are:
For the motion on a straight line path with constant acceleration the ratio of the magnitude of the displacement to the distance covered is:
A body moving with uniform acceleration has velocities 20 ms-1 and 30 ms-1 when passing two points A and B. Then the velocity midway between A and B is:
A. 25 ms-1
B. 24 ms-1
C. 25.5 ms-1
D. 106 ms-1
A moving body is covering a distance directly proportional to the square of time. The acceleration of the body is:
The area under the velocity – time graph gives the value of:
Which of the following is not a vector?
If the average velocity of a body is equal to mean of its initial velocity and final velocity, then the acceleration of the body is:
The speed-time graph of a body is straight line parallel to time axis. The body has:
The velocity-time graph of a body has a negative slope. The body is undergoing:
The distance-time graph of a body is parallel to time axis. The body is:
The distance-time graph of a body is a straight line inclined to time axis. The body is in:
Area under velocity-time graph is equal to the:
Area under speed-time graph is equal to the:
The direction of acceleration of an object moving in a circular path is:
Write true or false for the following statements:
The motion in animals is called locomotion. Mechanics deals with the motion of non-living objects.
Kinematics deals with the motion of non-living objects without taking into account the cause of their motion.
Motion along a curved line is called translator or rectilinear motion.
A body is said to be at rest, if it does not change its position with respect to the reference point.
A quantity which can be represented completely by magnitude alone is called a vector quantity.
A quantity which can be completely specified by magnitude as well as direction is called a scalar quantity.
Velocity and speed are measured in different units.
In one-dimensional motion, the average velocity and the instantaneous velocity are unequal.
A motion is said to be uniform, if a body undergoes equal displacements in equal intervals of time.
A motion is said to be uniform, if x t2
Acceleration is defined as the rate of change of velocity.
The graph between velocity and time for uniform acceleration is a curved line.
