Question : If a body moves with a constant speed in a circle:
Option 1: no work is done on it
Option 2: no force acts on it
Option 3: no acceleration is produced
Option 4: its velocity remains constant
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Correct Answer: no work is done on it
Solution : The correct option is: that no work is done on it.
No work is done on a body while it rotates in a circle at a constant speed. This is because the body's motion is perpendicular to the direction of the centripetal force that is pulling on it. The force that keeps the body moving in a circular motion and is always pointed in the direction of the circle's centre is known as the centripetal force.
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Question : Observing the motion of objects on an inclined plane______deduced that objects move with a constant speed when no force acts on them.
Option 1: Michael Faraday
Option 2: Johannes Kepler
Option 3: Galileo
Option 4: Archimedes
Question : "Impulse" can be defined as:
Option 1: the force acting on a body for a very long time.
Option 2: the work done by a body for a short time.
Option 3: the force acting on a body for a short time.
Option 4: the temperature acting on a body for a short time.
Question : Power exerted by an object moving in a straight line is equal to force multiplied by ______.
Option 1: displacement
Option 2: velocity
Option 3: work
Option 4: acceleration
Question : What is speed?
Option 1: It is the distance covered by an object in a unit of time
Option 2: It is the velocity of an object per unit time
Option 3: It is the force applied on covering a unit distance
Option 4: It is the acceleration of an object per unit time
Question : An object with constant speed:
Option 1: is not accelerated
Option 2: might be accelerated
Option 3: is always accelerated
Option 4: also has a constant velocity
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