This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
In Fig. 1.10, if the applied force ( F ) gets too big, the spring deforms. The spring has passed its elastic limit and will not go back to its original length.
A car travels on a road. If the road is wet, the wheels of the car may lose their grip. Hence, it is important to have sufficient gaps between the tread on a car tyre to increase friction. The gaps help to drain away water from the area of contact between the tyre and the road. A film of water between the tyre and the road will be disastrous when the brakes are applied. Return to
It is often mistaken that the wider tyres produce more friction. The friction is independent of the contact area. The larger contact area reduces pressure and thus reduces wear, besides heat can be conducted away faster.
Q:Q: The figure shows a wooden block B at rest on another block A. Both blocks are connected by a string which goes round a fixed smooth pulley. The kinetic friction between block A and the table is 14 N and that between blocks B and A is 10 N. What is the horizontal force P which is required to move block A with uniform velocity?
When A moves with uniform velocity, B also moves with the same speed but in the opposite direction. The forces acting on A and B are shown in the figure above.
Q:Q: A metal block of mass 4 kg is on a plane inclined at an angle of 30° to the horizontal. The block slides down the plane from rest and travels a distance of 1.0 m in 2.0 s. (Assume g = 9.81 m s−2.)(a) What is the friction between the block and the inclined plane when the block is sliding?(b) What is the coefficient of kinetic friction