Case study questions class 9 science chapter 8 motion.
CBSE Class 9 Case Study Questions Science Motion. Important Case Study Questions for Class 9 Exam. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Motion.
(i)Which of the following relation is always true when object moves in straight line
(b)distance is always greater than or equal to displacement
No. | Distance | Displacement |
1 | The complete length of the path between any two points is called distance | Displacement is the shortest length between any two point. |
2 | Distance is a scalar quantity | Displacement is a vector quantity |
3 | The distance can only have positive values. | Displacement can be positive, negative, and even zero. |
(b)distance is greater than and equal to displacement
(iii) What is Displacement when particle moves from point A to C through A-B-C?
(a)speed is scalar
(b)direction
Answer key-3
No. | speed | Velocity |
1 | The speed of an object is the distance covered by object per unit time. | Velocity is defined as the displacement by particle per unit time. |
2 | Speed can never be negative or zero | Velocity can be zero, negative, or positive.
|
3 | Speed is Scalar quantity
| Velocity is Vector quantity
|
(ii) An object travels 20 m in 5 s and then another 40 m in 5s. What is the average speed in m/s of the object?
(c)velocity is changing
(v) Odometers and speedometers are two of the many instruments used to measure speed of rotation.
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Case Study/Passage Based Questions:
Question 1:
Read the following and answer any four questions from (i) to (v) given below :
In the figure below the card is flicked with a push. It was observed that the card moves ahead while coin falls in glass.
(i) Give reason for the above observation. (a) The coin possesses inertia of rest, it resists the change and hence falls in the glass. (b) The coin possesses inertia of motion; it resists the change and hence falls in the glass. (c) The coin possesses inertia of rest, it accepts the change and hence falls in the glass. (d) The coin possesses inertia of rest, it accepts the change and hence falls in the glass.
(ii) Name the law involved in this case. (a) Newton’s second law of motion. (b) Newton’s first law of motion. (c) Newton’s third law of motion. (d) Law of conservation of energy
(iii) If the above coin is replaced by a heavy five-rupee coin, what will be your observation. Give reason. (a) Heavy coin will possess more inertia so it will not fall in tumbler. (b) Heavy coin will possess less inertia so it will fall in tumbler. (c) Heavy coin will possess more inertia so it will fall in tumbler. (d) Heavy coin will possess less inertia so it will not fall in tumbler.
(iv) Name the law which provides the definition of force. (a) Law of conservation of mass (b) Newton’s third law. (c) Newton’s first law (d) Newton’s second law.
(v) State Newton’s first law of motion. (a) Energy can neither be created nor be destroyed, it can be converted from one form to another, total amount of energy always remains constant. (b) A body at rest remains at rest or, if in motion, remains in motion at constant velocity unless it is acted upon by an external unbalanced force. (c) For every action in nature there is an equal and opposite reaction. (d) The acceleration in an object is directly related to the net force and inversely related to its mass.
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