Exercise Questions | Physics 9th | Chapter 2 | Kinematics | Balochistan Textbook Board, Quetta скачать в хорошем качестве

Exercise Questions | Physics 9th | Chapter 2 | Kinematics | Balochistan Textbook Board, Quetta

1. Encircle the correct option. The motion of blades of electric fan is an example of (a) Translatory motion (b) Vibratory Motion (c) Linear motion (d) Rotatory motion  The shortest distance from initial point to final point is known as (a) position (b) distance (c) displacement  (d) speed If a body covers equal distance in equal intervals of time, however small the intervals may be, the speed of body is said to be (a) uniform  (b) variable (c) average (d) none of these When two bodies are in motion then the velocity of one body relative of the other is said (a) average velocity (b) acceleration (c) relative velocity  (d) variable velocity The rate of change of velocity of body is known as (a) acceleration  (b) average velocity (c) displacement (d) total distance coverd Two balls of different masses are dropped freely from a tower which ball will reach the ground first (a) light ball (b) heavy ball (c) both balls will reach at the same time  (d) heavy ball reach the ground first The speed of a car increases from 20〖ms〗^(-1) to 50〖ms〗^(-1) in 10 seconds. Its acceleration is (a) 2〖ms〗^(-2) (b) 3〖ms〗^(-2)  (c) 5〖ms〗^(-2) (d) 7〖ms〗^(-2) The periodic motion of the pendulum of a clock is an example of (a) rotatory motion (b) translatory motion (c) vibratory motion  (d) linear motion A ball was dropped from a tower freely. The distance covered in first second is (a) 5m  (b) 10m (c) 50m (d) 100m A cyclist starting from rest moves with an acceleration of 2〖ms〗^(-2). What distance it will cover in 10 seconds? (a) 200m (b) 100m  (c) 20m (d) 10m A train is moving at a speed of 36kmh^(-1). Its speed expressed in 〖ms〗^(-1) is (a) 10〖ms〗^(-1)  (b) 20〖ms〗^(-1) (c) 25〖ms〗^(-1) (d) 30〖ms〗^(-1) Which of the following graph represents uniform acceleration (a) d (b) d t t (c) v (d) v t  t 2. Answer the following questions Distinguish between rest and motion. What is the difference between distance and displacement? Define average velocity and uniform velocity. Differentiate between speed and velocity. If distance time graph is an inclined straight line then what information you get from it? What would be the shape of a speed-time graph of a body moving with variable speed? Derive the three equations of motion. What is retardation? Define scalar and vectors. Give two examples of each? How can vector quantities be represented graphically? 1. A car travels 100 meters in 5 seconds what is its average speed? 2. A car accelerates from 5ms^(-1) to 25ms^(-1) in 10 seconds. What is its acceleration? 3. A car starts from rest. If acceleration of car is 5ms^(-2) then what will be its velocity after 8s? Express this velocity in kmh^(-1). 4. A car is moving with 180kmh^(-1). A negative acceleration of 10〖ms〗^(-2) is produced after applying brakes. What will be the distance covered by car before coming to rest? 5. A ball thrown up vertically with a speed of 〖50ms〗^(-1). (a) How long does it take to reach its highest point? (b) How does high the ball rise? 6. A driver brings a car travelling at 22〖ms〗^(-1) to stop it in 2 seconds. (a) What is the car’s acceleration? (b) How far does it travels before stopping? 7. A car moving with velocity of 72kmh^(-1) is brought to rest in 10s. Calculate the retardation. 8. A body start up from rest and acquires a velocity of 8〖ms〗^(-1) in 5s. Calculate (a) The acceleration (b) The distance covered in 5s (c) The distance covered in 5th s 9. An airplane must reach at 71〖ms〗^(-1) from takeoff. If the runway is 1km long. What must the acceleration be? 10. The figure shows a speed-Time graph for a motor cycle. Find (a) What is the maximum speed of the motorcycle? (b) For how many second does the motorcycle stay at its maximum speed? (c) For how many seconds is the motorcycle actually moving? (d) How much speed does the motorcycle gain in first 20s? How much speed does it gain every second? What is its acceleration? (e) What is the retardation of the motorcycle during last 10 seconds. 11. Velocity of a motorcycle becomes 20〖ms〗^(-1) in 4 seconds with an acceleration of 2〖ms〗^(-2). Find its initial velocity. 12. A stone is dropped from height of 80m. Find its velocity just before hitting the ground. If it reaches the ground in 4 seconds.