AIR FORCE BAL BHARATI SCHOOL
PRACTICE WORKSHEET 4
CLASS 9 (PHYSICS)
CHAPTER- MOTION
(Topic – Equations of motion and Uniform Circular Motion)
1. A body is thrown vertically upward with velocity u, the greatest height h to which it
will rise is,
(a) u/g (b) u2/2g (c) u2/g (d) u/2g
2. Suppose a boy is enjoying a ride on a merry-go-round which is moving at a constant
speed of 10 m/s. It implies that the boy is
(a) at rest (b) moving with no acceleration
(c) in accelerated motion (d) moving with uniform velocity
3. A particle revolves around a circular path. The velocity of the particle is
(a) Along the circumference of the circle (b) Along the tangent
(c) Along the radius (d) Zero
4. A stone released with zero velocity from the top of a tower, reaches ground in 4s. The
height of the tower is about
(a) 20m (b) 40m (c) 80m (d) 160m
5. When displacement made is directly proportional to the time, object is said to travel
with
(a) Zero velocity (b) Constant speed
(c) Uniform Velocity (d) Constant Acceleration
6. How will the equations of motion for an object moving with a uniform velocity
change?
7. A car starts from rest and moves along the x-axis with a constant acceleration of
5m/s2 for 8 seconds. If it then continues with constant velocity, what distance will the
car cover in 12 seconds since it started from the rest? (Ans: 320 m)
8. An electron moving with a velocity of 5 × 104 m/s enters into a uniform electric field
and acquires a uniform acceleration of 104 ms-2 in the direction of its initial motion.
(i) Calculate the time in which the electron would acquire a velocity double of its
initial velocity. (Ans: 5s)
(ii) How much distance would the electron cover in this time? (Ans: 37.5 × 104 m)
PRACTICE WORKSHEET 4
CLASS 9 (PHYSICS)
CHAPTER- MOTION
(Topic – Equations of motion and Uniform Circular Motion)
1. A body is thrown vertically upward with velocity u, the greatest height h to which it
will rise is,
(a) u/g (b) u2/2g (c) u2/g (d) u/2g
2. Suppose a boy is enjoying a ride on a merry-go-round which is moving at a constant
speed of 10 m/s. It implies that the boy is
(a) at rest (b) moving with no acceleration
(c) in accelerated motion (d) moving with uniform velocity
3. A particle revolves around a circular path. The velocity of the particle is
(a) Along the circumference of the circle (b) Along the tangent
(c) Along the radius (d) Zero
4. A stone released with zero velocity from the top of a tower, reaches ground in 4s. The
height of the tower is about
(a) 20m (b) 40m (c) 80m (d) 160m
5. When displacement made is directly proportional to the time, object is said to travel
with
(a) Zero velocity (b) Constant speed
(c) Uniform Velocity (d) Constant Acceleration
6. How will the equations of motion for an object moving with a uniform velocity
change?
7. A car starts from rest and moves along the x-axis with a constant acceleration of
5m/s2 for 8 seconds. If it then continues with constant velocity, what distance will the
car cover in 12 seconds since it started from the rest? (Ans: 320 m)
8. An electron moving with a velocity of 5 × 104 m/s enters into a uniform electric field
and acquires a uniform acceleration of 104 ms-2 in the direction of its initial motion.
(i) Calculate the time in which the electron would acquire a velocity double of its
initial velocity. (Ans: 5s)
(ii) How much distance would the electron cover in this time? (Ans: 37.5 × 104 m)
