A wheel of radius 20 cm is pushed to move it on a rough horizontal surface. It is found to move through a distance of 60 cm

Monjur Alahi

A wheel of radius 20 cm is pushed to move it on a rough horizontal surface. It is found to move through a distance of 60 cm on they road during the time it completes one revolution about the centre. Assume that the linear and the angular accelerations are uniform. The frictional force acting on the wheel by the surface is

(a) along the velocity of the wheel

(b) opposite to the velocity of the wheel

(c) perpendicular to the velocity of the wheel

(d) zero.


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

(a) along the velocity of the wheel

Explanation: 

Perimeter of the wheel = 2π*0.20 =0.4π =1.26 m 

But it moves only 0.60 m. 

So the wheel slips on the road. At the point of contact with the road, the part of the wheel is sliding backward. Hence the force of friction acts forward i.e. along the velocity of the wheel.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
Ablock is on rough surface.is the maximum force applied so that the block does not move is equal to the minimum force applied to just move the block?

A block resting on a horizontal surface and suppose a force is applied to it and still the body is not moving then, friction force is equal to applied force...

1 Answers 1 views
In a situation the contact force by a rough horizontal surface on a body placed on it has constant magnitude.

(b) decrease 

1 Answers 1 views
A boy of mass M is applying a horizontal force to slide a box of mass M' on a rough horizontal surface.

The correct answer is (a) μ < μ', M < M'   Explanation:  The force applied by the boy on the box is equal to the force of friction between the shoes of the boy and...

1 Answers 1 views
A sphere is rolled on a rough horizontal surface. It gradually slows down and stops.

(a) decrease the linear velocity (b) increase the angular velocity Explanation:  When a sphere is pushed on a rough horizontal surface to roll, it is given some linear speed and it ties to slip on...

1 Answers 1 views
Air is pushed into a soap , bubble of radius r to double its radius. If the surface tension of the soap solution is S,

The correct answer is (d) 24πr2S. Explanation:  The surface tension S is equal to surface energy per unit area, S = U/A  →U = SA  The total area of the soap bubble =2*4πr² =8πr²  The...

1 Answers 1 views
A spinning wheel is brought in contact with an identical wheel spinning at identical speed.

 The correct answer is: (a), (c) (a), kinetic  (c) mechanical

1 Answers 1 views
A spinning wheel A is brought in contact with another wheel E initially at rest.

The correct answer is all  (a) kinetic  (b) total  (c) mechanical  (d) internal.

1 Answers 1 views
A boy of mass M is applying a horizontal force to slide a box of mass M' on a rough horizontal surface,

The correct answer is (a) μ < μ', M < M'   Explanation:  The force applied by the boy on the box is equal to the force of friction between the shoes of the boy and...

1 Answers 1 views
A sphere is rolled on a rough horizontal surface. It gradually slows down and stops,

(a) decrease the linear velocity (b) increase the angular velocity Explanation:  When a sphere is pushed on a rough horizontal surface to roll, it is given some linear speed and it ties to...

1 Answers 1 views
Air is pushed into a soap bubble of radius r to double its radius.

The correct answer is (d) 24πr2S. Explanation:  The surface tension S is equal to surface energy per unit area, S = U/A  →U = SA  The total area of the soap bubble =2*4πr² =8πr²  The...

1 Answers 1 views
X