CLASS IX- Physics Worksheet
MOTION
LEVEL I:
1. A car travels 300 km at a uniform speed of 15km/hr and the next 600km at
a uniform speed of 30km/hr.Find its average speed
2. A body is moving in a circle of radius R. The body moves through half the
circle. Calculate the distance and displacement.
3. The graph given below shows the velocity of a body at different time intervals. .
7
velocity
D
3
A
0
time
B
C
5
7
9
a) What type of motion is represented by AB & CD of the graph?
b) What type of motion is represented by BC of the graph?
c)Find out the acceleration of the body in the time
interval
1) 0s to 5s
2) 7s to 9s
d)Distance travelled by the body in the time
interval
1)0 to 5s
2)5s to 7s
3) 7s to 9s
4) The table below shows the distance covered by a car at regular intervals of time.
Plot the graph and calculate the velocity from the graph
Time in
0
seconds
Distance in 0
meters
3
6
9 12 15 18
15 30 45 60 75 90
5) Velocity –Time graph of a body is shown below. Answer the questions given
below referring to the graph
5m/s
velocity
o
1
2
3
4
6
7
Time (seconds)
a) For how many seconds was the body in accelerated motion?
b) For how many seconds was the body in uniform motion
c) Find the acceleration of the body
d) Find the distance covered by the body when it was in uniform motion
e)What is the retardation of the body
f) What is the total distance covered by the body ?
LEVEL II:
6) A body starts from rest. Then its velocity uniformly increases to 10m/s in the next
5seconds. Then it moves with this velocity 10m/s for the next 2secs. Thereafter its
velocity begins to decrease at a uniform rate and comes to rest after 8 seconds.
a) Plot a velocity – time graph
b) Calculate the acceleration of the body
c) Find the distance covered during acceleration
7) A train moving with a velocity of 20m/s is brought to rest by applying brakes in
5s.Calculate the retardation.
8) A train travels with a speed of 60km/h from station ‘A’ to station ‘B’ and the returns
back with a speed of 80km/h from station ‘B’ to station ‘A’. Find:
(i) The average speed (ii) and the average velocity of the train
9) A train is moving with a velocity of 90km/h. When the brakes are applied, the
retardation is produced is 0.5m/s2. Find:
(i) The velocity produced after 10s
(ii) The time taken by the train to come to rest
10) A car travels a certain distance with constant acceleration and average velocity of
20m/s. The final velocity acquired by the car is 25m/s. Find the initial velocity of the car
LEVEL III
11) When the brakes are applied to a bus, the retardation produced is 25cm/s2 and the bus
takes 20s to stop. Calculate:
(i) The initial velocity of bus
(ii) The distance travelled by the bus during this time
12) A body moves from rest with uniform acceleration and travels 270m in 3s. Find the
velocity of the body at 10s after the start.
13) A body moving with constant acceleration travels the distances of 3m and 8m
respectively in 1s and 2s. Calculate:
(i) The initial velocity
(ii) The acceleration of the body
14) A car travels with a uniform velocity of 25m/s for 5s. The brakes are then applied and
the car is uniformly retarded and comes to rest in further 10s.Find:
(i) The distance which the car travels before the brakes are applied
(ii) The retardation
(iii) The distance travelled by the car after applying the brakes
15) A train starts from rest and accelerates at a rate of 2m/s2 for 10s. It then maintains a
constant speed for 200s. The brakes are then applied and the train is uniformly retarded
and comes to rest in 50s. Find:
(i) The maximum velocity reached.
(ii) The retardation in the last 50s
(iii) The total distance travelled
(iv)the average velocity of the train.