Assertion: When a force `vecF` attempts to slide a body along a surface, a frictional force parallel to the surface and directed so as to oppose the s

Monjur Alahi

Assertion: When a force `vecF` attempts to slide a body along a surface, a frictional force parallel to the surface and directed so as to oppose the sliding, is exerted on the body by the surface.
Reason: It is due to the bonding between the body and the surface.
A. If both assertion `&` Reason are True `&` the Reason is a corrrect explanation of the Asserion.
B. If both Assertion `&` Reason are True but Reason is not correct explanation of the Assertion.
C. If Assertion is Trie but the Reason is False.
D. If both Assertion `&` Reason are false


0 like 0 dislike
2 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

Correct Answer - A
Bond tension opposes relative motion.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
A given object taken double time to slide down a `45^(@)` rough incline as it takes to slide down a perfectly smooth `45^(@)` incline. The coefficient

Correct Answer - C `sqrt((2s)/(g sin 45^(@) - mu g cos 45^(@))) = 2 xx sqrt((2s)/(g sin 45^(@)))` `(1)/(((1)/(sqrt2) - (mu)/(sqrt2))) = (4)/(((1)/(sqrt2)))` `1 = 4 (1 - mu)` `mu =...

2 Answers 1 views
Assertion: Frictional forces are conservative forces. Reason: Potential energy can be associated with frictional forces.

Correct Answer - D Friction is non conservative, PE can not be associated.

2 Answers 1 views
Assertion: Force of friction depends on the actual area of contact. Reason: Larger the area of actual contact, larger is oppose to motion.

Correct Answer - A Force of friction `uparrow` with `uparrow` of actual area.

2 Answers 2 views
Assertion: Static frictional force is a self adjusting force. Reason: Force of static friction does not depend upon the mass of the body.

Correct Answer - B `f_(s)("max")=muN` depends on `mu` and N and not on mass.

2 Answers 1 views
Assertion: Frictional force is the component of contact force parallel to the surface. Reason: Friction force always opposes the motion of a body.

Correct Answer - C Friction force opposes relative motion.

2 Answers 1 views
Assertion : The force of tension on a body always act away from the body. Reason: Friction force always opposes the motion of a body.

Correct Answer - C Friction opposes relative motion.

2 Answers 2 views
Assertion: Magnitude of the contact force is always greater than the magnitude of frictional force. Reason: Contact force is the resultant of the fric

Correct Answer - A `F_(C)=sqrt(f^(2)+N^(2))`

2 Answers 1 views
Assertion: When a person walks on a rough surface, the frictional force exerted by the surface on the person is opposite to the direction of tendenc o

Correct Answer - B Reason do not explain assertion.

2 Answers 1 views
A smooth block is released at rest on a `45^(@)` inclined and then slides a distance d. the time taken to slide is n times as much to slide on rough i

`t_(1)=sqrt((2d)/(g sin45^(@)))=sqrt((2d)/((g)/sqrt(2)))` `t_(2)=sqrt((2d)/(((g)/(sqrt(2))-mu(g)/(sqrt(2))))` `t_(2)=nt_(1)` `sqrt((2d)/(((g)/(sqrt(2))-mu(g)/(sqrt(2)))))=nsqrt((2d)/((g)/(sqrt(2))))` `(1)/(sqrt(1-mu))=n` `(1)/(1-mu)=n^(2)` `1 = n^(2)-n^(2)mu` `(1)/(n^(2))=-1-mu` `mu=(1-(1)/(n^(2)))`

2 Answers 1 views
Consdier the equation `(d)/(dt)[intvecF.dvecs]=A[vecF.vecp]` Then dimension of A will be (where `vecF=` force, `dvecs=` small displacement, t=time and

`A=("d work")/(dt)(1)/(F)P` `[A]=(["work"])/(["time"]["work"]/(["displacement"])xx[P])` `=(L)/(T)MLT^(1)=(1)/(M)`

2 Answers 1 views
X