Question

Medium

Solving time: 3 mins

SELECT MULTIPLE OPTION

A

The block will not move when only P acts, but will move when both P and Q act

B

If the block moves, the acceleration will be 0.5m/s2

C

When the block moves, its direction of motion will be tan−1(13/4) east of north

D

When both P and Q act, the direction of the force of friction acting on the block will be tan−1(3/4) west of south

Views: 5,547 students

Updated on: Sep 27, 2022

## Text solutionVerified

(A, B, C)

f1max=0.2×10×10=20N

As fmax<P, friction force

f1=15Nandblockdonotmove

When both P and Q acts, resultant applied force,

R=P2+Q2=152+202=625=25N

R>f1max thes block moves when both P and Q acts

a=mR−f1max=1025−20=105=0.5m/s2

Direction of R,tanθ=2015=43

θ=tan−143(eastofnorth)

Thus, direction of force of friction (F, ) will be opposite to R, i.e. west of south.

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### Related books for questions on Laws of motion

Question Text | A 10kg block is placed on a horizontal surface whose coefficient of friction is 0.2. A horizontal force P=15N first acts on it in the eastward direction. Later, in addition to P a second horizontal force Q=20N acts on it in the northward direction : ( Take g=10m/s2) |

Updated On | Sep 27, 2022 |

Topic | Laws of motion |

Subject | Physics |

Class | Class 11 |

Answer Type | Text solution:1 Video solution: 1 |

Upvotes | 160 |

Avg. Video Duration | 14 min |