Very Short Answer Questions (7 Q.)
change in position of a body with respect to time is called motion.
Write S.I. unit of speed and time.
unit of speed is metre per second (m/s) and S.I. unit of time is second (s).
What is a speedometer?
is a device that is used to measure the speed of the vehicle in km/h.
Define time period of a simple pendulum.
time taken by a simple pendulum to complete one oscillation is called its time
any two ancient clocks that are used to measure time?
Sand clock and water clock
Short Answer Questions (7 Q.)
Define distance and speed.
Distance: The distance covered by a
moving object is the actual length of the path followed by the object.
Speed: Speed is the total
distance covered divided by the total time taken.
Define periodic motion and give an example.
an object repeats its motion after an equal interval of time, this type of
motion is called periodic motion.
Motion of a simple pendulum
What is odometer? What is its function?
It is a device that records total distance covered by
the vehicle. It is used in vehicles to calculate the distance travelled in a
Define oscillation? On which factor does the time
period of a pendulum depend?
pendulum completes one oscillation when its bob moves from one extreme position
A to the other extreme position B and comes back to A.
time period of a simple pendulum depends on the length of the pendulum.
Express 72 km/h in m/s.
72 km/h = 20 m/s
The distance between two stations is 120 km. A train
takes 2 hours to cover this distance. Calculate the speed of the train.
travelled= 120 km
taken = 2 h
Long Answer Questions (6 Q.)
What are the different types of motion?
motion: Motion of an object along a straight line is called a rectilinear motion.
Example A parade
motion: Motion of an object along a circular path is called a circular motion.
Example A spinning top
motion: The to and fro motion of an object is called an oscillatory motion.
Example A simple pendulum
motion: The motion of an object that is repeated at regular interval is called
a periodic motion. Example Revolution of Earth around the Sun
The odometer of a car reads 5500.0 km when the clock
shows the time 06:30 p.m. What
is the distance moved by the car, if at 06:50 p.m., the odometer reading has changed to 5530.0 km?
Calculate the speed of the car in km/h for this duration.
travelled by the car between 06:30 p.m. and 06:50 p.m.
= 5530.0 km − 5500.0 km
taken by the car to cover that distance
06:50 p.m. − 06:30 p.m.
of the car in km/min
of the car in km/h
A simple pendulum takes 20 seconds to complete 5
oscillations. Calculate the time taken by the pendulum to complete 20
time taken by a pendulum to complete 5 oscillations = 20sec
time taken by the pendulum to complete 1 oscillation 4 sec
the time taken by the pendulum to complete 20 oscillations
The given figure represents distance-time graph.
Answer the following questions.
What is the distance covered after
Calculate the speed of the object between 12 s and 20 s.
The distance covered by the object after 8 second is 4 m.
travelled between 12th sec and 20th sec
Speed = 0.25 m/s