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Physics Chapter 13 : Topic 1
Inertial and Non-Inertial Frames
1 / 30
A frame of reference in which Newton’s laws of motion are valid without introducing any additional forces is called:
Reasoning: An inertial frame is one that is either at rest or moving with constant velocity, where Newton’s laws apply directly.
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Which of the following correctly describes an inertial frame of reference?
Reasoning: An inertial frame has no acceleration; it may be at rest or moving with uniform velocity.
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A passenger sitting in a car moving at constant velocity observes another car moving away. The passenger’s frame is:
Reasoning: Motion itself does not make a frame non-inertial. A frame moving with constant velocity is inertial.
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A reference frame becomes non-inertial when it:
Reasoning: Acceleration or rotation causes a frame to become non-inertial.
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In a non-inertial frame, Newton’s second law appears to fail because:
Reasoning: Pseudo forces must be introduced in accelerating frames to apply Newton’s laws.
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The force experienced by a passenger when a bus suddenly starts moving forward is due to:
Reasoning: The passenger feels pushed backward because the bus frame accelerates and acts as a non-inertial frame.
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Which of the following is an example of an inertial frame?
Reasoning: A spacecraft moving with constant velocity has no acceleration, so it represents an inertial frame.
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The Earth is approximately considered an inertial frame for many experiments because:
Reasoning: Although Earth rotates and revolves, these effects are small enough for many everyday situations.
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A person standing inside a lift feels heavier when the lift accelerates upward. The lift is:
Reasoning: The accelerating lift is a non-inertial frame, producing an apparent force.
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Which statement is true about an object in an inertial frame?
Reasoning: According to Newton’s first law, an object maintains constant velocity when no net force acts.
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A rotating reference frame is non-inertial because:
Reasoning: Circular motion involves centripetal acceleration, making the rotating frame non-inertial.
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A car moving around a circular track at constant speed is an example of:
Reasoning: Even with constant speed, changing direction means the car has acceleration.
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The main difference between inertial and non-inertial frames is the presence of:
Reasoning: Acceleration distinguishes non-inertial frames from inertial frames.
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A person inside a freely falling elevator experiences weightlessness because:
Reasoning: The person and elevator fall together, so no normal reaction force is felt.
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Which force is introduced only when describing motion from a non-inertial frame?
Reasoning: Pseudo forces are apparent forces used to explain motion in accelerating frames.
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A passenger in a turning car feels pushed sideways because:
Reasoning: The passenger tends to continue in a straight line while the car turns, creating the sensation of a sideways force.
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Which situation represents a non-inertial reference frame?
Reasoning: Acceleration of the rocket makes its frame non-inertial.
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Newton’s laws can be applied directly in:
Reasoning: Newton’s laws are directly valid only in inertial frames.
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If a frame of reference moves with velocity $\mathbf{20\ m/s}$ in a straight line and does not change its speed or direction, it is:
Reasoning: Constant velocity means zero acceleration, which defines an inertial frame.
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A person observing motion from a non-inertial frame may incorrectly conclude that:
Reasoning: Pseudo forces make objects appear to accelerate even without a real force acting.
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The reference frame attached to a freely moving satellite far from planets is approximately:
Reasoning: A satellite far from external forces can approximate an inertial frame when moving uniformly.
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A lift moving upward with constant velocity is:
Reasoning: Constant velocity means zero acceleration, so the lift acts as an inertial frame.
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When a bus suddenly stops, passengers move forward because:
Reasoning: Passengers continue moving due to inertia while the bus slows down.
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Which statement about inertial frames is incorrect?
Reasoning: An inertial frame does not need to be at rest; uniform motion is also allowed.
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Two reference frames moving with constant velocity relative to each other are:
Reasoning: Any frame moving at constant velocity relative to an inertial frame is also inertial.
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The apparent outward force felt in a rotating frame is called:
Reasoning: Centrifugal force is an apparent force observed in rotating non-inertial frames.
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A person standing on a rotating platform observes objects moving differently because:
Reasoning: Rotation introduces acceleration, making the platform a non-inertial frame.
28 / 30
The concept of pseudo force is necessary because:
Reasoning: Pseudo forces allow Newton’s laws to be used from a non-inertial viewpoint.
29 / 30
A frame attached to a rotating Earth is technically:
Reasoning: Earth’s rotation produces centripetal acceleration, making it a non-inertial frame.
30 / 30
Which pair correctly represents the classification of frames?
Reasoning: Frames with constant velocity are inertial, while accelerating or rotating frames are non-inertial.
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