Physics
Assertion (A): If a moving body travels equal distances in equal intervals of time, its motion is said to be uniform.
Reason (R): For uniform motion, the speed of the moving body remains constant.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Motion in One Dimension
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Answer
Both A and R are true and R is the correct explanation of A
Explanation
Assertion (A) is true because when a moving body covers equal distances in equal intervals of time, its motion is defined as uniform motion.
Reason (R) is true because in uniform motion, the speed remains constant, meaning the body covers the same distance in each equal time interval.
The Reason justifies the Assertion because constant speed directly leads to equal distance covered in equal time intervals which is nothing but definition of uniform motion.
Therefore, both A and R are true and R is the correct explanation of A.
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Related Questions
In …………… motion, the distance of a point on the body remains constant from a fixed reference point.
- vibratory
- rectilinear
- curvilinear
- circular
Assertion (A): Weight is equal to mass in deep space.
Reason (R): Weight depends on gravitational force.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Fill in the blanks:
(a) Two boys cycling on the road with the same speed are …………… relative to each other.
(b) The motion in a …………… is rectilinear motion.
(c) One to and fro motion of a clock pendulum takes time = …………… .
(d) 36 km h-1 = …………… m s-1.
(e) Total distance travelled = …………… x total time taken.
(f) The weight of a girl is 36 kgf. Her mass will be …………… .
(g) The weight of a body is measured using …………… .
Write true or false for each statement:
(a) Two trains going in opposite directions with the same speed are at rest relative to each other.
(b) A ball is thrown vertically upwards. Its motion is uniform throughout.
(c) The motion of a train starting from one station and reaching at another station is non-uniform.
(d) A motion which repeats itself after a fixed interval of time is called periodic motion.
(e) A ball thrown by a boy from a roof-top has oscillatory motion.
(f) Mass has both magnitude and direction.
(g) Weight always acts vertically downwards.
(h) Mass varies from place to place but weight does not.