Newton's First Law of Motion

A reference frame attached to the earth

Give two examples of non-inertial frame of reference.

Newton's law of motion is applicable in non-inertial frame of reference.

Name the quantity which is the cause of motion. (velocity/ momentum/ force/ pressure)

Name the property of matter which forms the basis of Newton’s first law of motion.

Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?

A passenger getting down from a moving bus falls in the direction of the motion of the bus, this is an example for

A body of mass $50 \mathrm{kg}$ is suspended using a spring balance inside a lift at rest. If the lift starts falling freely, the reading of the spring balance is

A block is pushed momentarily on a horizontal surface with initial velocity $\upsilon$ . If $\mu$ is the coefficient of sliding friction between the block and surface, the block will come to rest after time (g = acceleration due to gravity)

Assertion: A body, whatever its motion is always at rest in a reference frame that is fixed to the body itself.

Reason: The relative velocity of a body with respect to itself is always zero.

Assertion: For an observer looking out through the window of a fast moving train, the nearby objects appear to move in the opposite direction to the train, while the distant object appear to be stationary.

Reason: If the observer and the object are moving at velocities and respectively with reference to a laboratory frame, the velocity of object with respect to the observer is.

Assertion: A body whatever its motion is always at rest in reference frame which is fixed to the body itself.

Reason: The relative velocity of a body with respect to itself is always zero.

Assertion: In the reference frame of centre of mass, net force acting on system is always zero.

Reason: A pseudo force given by ${\overrightarrow{P}}_{\mathrm{S}}=-m{\overrightarrow{a}}_{\mathrm{cm}}$ (where $m$ is mass of system and ${\overrightarrow{a}}_{\mathrm{cm}}$ is acceleration of centre of mass) acts on system which balances all the external forces.

Assertion: An observer moving with constant speed must be an inertial reference frame.

Reason: An observer is called inertial if its change in velocity is zero.

A force of 5 newton acts on a body of weight 9.80 newton. What is the acceleration produced in $\mathrm{m}\mathrm{ }{\mathrm{s}}^{–2}$ ?

A block of mass $m$ is attached to a spring in natural length of spring constant $k$ . The other end $A$ of the spring is moved with a constant velocity $v$ away from the block. Find the maximum extension in the spring.

A reference frame attached to the Earth

Statement 1 :  A particle is found to be at rest when seen from a frame S₁ and moving with a constant velocity when seen from another frame S₂. We can say both the frames are inertial.

Statement 2 :  All frames moving uniformly with respect to an inertial frame are themselves inertial.

Which motion does not require force to maintain its motion?