ICSE Worksheet for chapter-4 Motion in One Dimension class 9
Worksheet For class 9
Summary
- REST AND MOTION, DISTANCE AND DISPLACEMENT
- SPEED AND VELOCITY, ACCELERATION AND RETARDATION
- MOTION UNDER GRAVITY, UNIFORMLY ACCELERATED MOTION
SECTION 1 – OBJECTIVE
Q1. A body when projected up goes to height ‘h’ in time ’t’ and then returns back at the point of projection. The incorrect statement is:
- The displacement is zero
- The average velocity is 2h/t.
- The final speed is same as the initial speed
- Acceleration is constant.
Q2. Unit of retardation is:
- m/s
- m/s^{2}
- m
- m s^{2}
Q3. The velocity of a body starting from rest is directly proportional to time. Which is uniform?
- Velocity only
- Acceleration only
- Both velocity and acceleration
- Neither velocity nor acceleration
Q4. For a uniformly accelerated motion, the velocity-time graph is:
- A straight line parallel to the time axis
- A straight line perpendicular to the time axis
- A straight line inclined to the time axis
- A curve
Q5. A body is projected vertically upwards with an initial velocity. If acceleration due to gravity is g, the time for which it remains in air is:
- u/g
- u.g
- 2u/g
- u/2g
Q6. A body is dropped from top of tower. The quantity which remains constant is:
- Displacement
- Speed
- Velocity
- Acceleration
Q7. A pebble is thrown vertically upwards with a speed of 20 m/s. How high will it be after 2 s?
(g = 10 m/s^{2})
- 10 m
- 20
- 15 m
- 22 m
Q8. A bullet initially moving with a velocity 20 m/s strikes a target and comes to rest after penetrating a distance 10 cm in the target. The retardation caused by the target is:
- 2000 m/s^{2}
- 2550 m/s^{2}
- 3000 m/s^{2}
- 4500 m/s^{2}
Q9. Slope of displacement v/s time graph is:
- Velocity
- Displacement
- Acceleration
- Time
Q10. The shortest path travelled by any object is:
- Distance
- Displacement
- Velocity
- Acceleration
SECTION II - SUBJECTIVE
Q1. Differentiate between following:
- Distance& Displacement
- Uniform acceleration & Variable acceleration
- Speed& velocity
Q2. A bullet of mass 0.006 kg travelling at 120 m/s penetrates deeply into a fixed target and is brought to rest in 0.01 s. Calculate:
- The distance of penetration in the target, and
- The average retarding force exerted on the bullet.
Q3. Derive an expression for the distance covered in the n^{th} second by a body moving with uniform acceleration.
Q4. A train is moving with a velocity of 90 km/h. When the brakes are applied, the retardation produced is 0.5 m/s^{2}. Find (a) the velocity after 10s (b) The time taken by the train to come to rest.
Q5. A vehicle is accelerating on a straight road. Its velocity at any instant is 30 km/h. After2s, it is 33.6 km/h and after further 2s, it is 37.2 km/h, find the acceleration of the vehicle in m/s^{2}. Is the acceleration uniform?
Q6. A car travels first 30 km with a uniform speed of 60 km/h and the next 30 km with a uniform speed of 40 km/h. Calculate:
- The total time of journey
- The average speed of car
Solutions
Objective Problems
1.(B) | 2.(B) | 3.(B) | 4.(C) | 5.(C) | 6.(D) | 7.(B) | 8.(A) | 9.(A) | 10.(B) |
Subjective Problems
Q2. 1. s=0.6m
2. F =72N
Q4. 1. v = 20m/s
2. t = 50s
Q5. The value of acceleration is 0.5m/s^{2}. Yes the acceleration is uniform.
Q6. 1.Total time of journey = 75min
2. Average speed of car is 48km/h
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