Sliding Friction
Sliding Friction
The frictional force present when one object moves slowly (or slides) over the surface of another object, is known as sliding friction. Thus, sliding friction comes into play when an object is sliding (moving slowly but continuously) over another object. We can demonstrate the sliding friction by extending the above activity further. In the above activity we have seen that when a certain force (equal and opposite to static friction) is applied by us, the wooden block just tends to move or slip on the table Let us now increase the force applied to pull the wooden block a little more (by pulling the spring balance more). We will see that the wooden block begins to slide (or move slowly) on the table top.
The force required to keep an object moving slowly (or sliding) with the same speed is a measure of the sliding friction, It has been found that the force required to keep the wooden block sliding (once it has started sliding) is less than the static friction. In other words, when an object starts sliding, then the friction is less. This means that the sliding friction is smaller than the static friction. For example, in Figure 10 we can see that when the wooden block starts sliding, then the spring balance shows a reading of 4 N force (4 newtons force). This means that the magnitude of sliding friction is 4 newtons (which is smaller than the static friction of 5 newtons).
A big wooden box is being pushed on the ground from east to west direction. The force of friction due to ground will act on this box towards : | |||
| Right Option : C | |||
| View Explanation | |||
It is easier to pull a bag with wheels rather than without wheels because - | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct ? (a) When one object moves slowly over the surface of another object the frictional force present, is known as static friction . (b) Sliding friction comes into play when an object is sliding over another object. (c) The interlocking of the two surfaces is less when an object has already started moving, therefore, the sliding friction is smaller than the static friction. | |||
| Right Option : B | |||
| View Explanation | |||
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