JEE PHYSICS MCQ: MOTION IN PLANE

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Assertion: Three given concurrent forces may be in equilibrium which is

200 \mathrm{~N} ; 300 \mathrm{~N}

and 500

\mathrm{N}

Reason: Three forces are concurrent and their summation or net force acting on a point is zero when

500 \mathrm{~N}

acts in one direction and both

200 \mathrm{~N}

and

300 \mathrm{~N}

act in the opposite direction.

View answer and explanation

Correct option: A

Both Assertion and Reason are true, and Reason is the correct explanation for Assertion

Option A is correct because the forces can be in equilibrium if their vector sum is zero, and the reason correctly explains this condition for the given forces.

More Questions from MOTION IN PLANE

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Given,

\mathrm{\vec P} = \mathrm{\vec A} + \mathrm{\vec B}\,\,\mathrm{and}\,P = A + B.

The angle between

\mathrm{\vec A}\,and\,\mathrm{\vec B}

is Assertion: The necessary condition for motion in two dimensions, velocity and acceleration vectors should have any angle between

0^{\circ}

and

90^{\circ}

between them.
Reason: For two-dimensional or three-dimensional motion, velocity and acceleration of an object works in opposite direction.

\mathrm{If}\,(\mathbf{a}+3 \mathbf{b}) \cdot(7 \mathbf{a}-5 \mathbf{b})=0

and

(\mathbf{a}-4 \mathbf{b}) \cdot(7 \mathbf{a}-2 \mathbf{b})=0

. Then, the angle between

\mathbf{a}

and

\mathbf{b}

is At the top of the trajectory of a projectile, the direction of its velocity and acceleration are A ball is thrown at an angle

\theta

and another ball is thrown at an angle

\left(90^{\circ}-\theta\right)

with the horizontal direction from the same point with velocity

39.2 \mathrm{~ms}^{-1}

. The second ball reaches

50 \mathrm{~m}

higher than the first ball. Find their individual heights. Take

{g}=9.8 \mathrm{~ms}^{-2}

. Assertion: The drover in a vehicle moving with a constant speed on a straight road is in a non-inertial frame of reference.

Reason: A reference frame in which Newton's laws of motion are applicable is non-inertial.