write a activity to show that friction increases with the roughness of the surface with diagram
Answers
Explanation:
Frictional Force:
Frictional force refers force generated by "two surfaces" that 'contacts' and 'slide' against each other. These forces are mainly affected by the "surface texture" and "amount of force" impelling them together.
Effect of roughness on frictional force:
Choose three surfaces with different levels of roughness.
Roll a ball along these surfaces.
Record the time taken for the ball to come to rest and also the distance travelled by the ball.
From the recorded data, we will notice that value of speed drops with increase in roughness.
This is due to the fact that friction increases with increase in roughness.
Answer:
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Explanation:
Introduction
Friction is a force that opposes motion between any surfaces that are touching. Friction can work for or against us. For example, putting sand on an icy sidewalk increases friction so you are less likely to slip. On the other hand, too much friction between moving parts in a car engine can cause the parts to wear out. Other examples of friction are illustrated in the two Figures below
Concept: Air friction.
Activity 2:
To begin, fill the bottle with rice. Try sticking the chopstick down into the bottle. When you grab the chopstick and pull up, what happens? The stick should just come right out.
How do you make the rice stick to the chopstick so you can just pick it up? You've got to add more friction. Here's how.
Put the lid on the bottle and tap the bottom of the bottle on a hard surface. Do this a few times to compact the rice and get rid of the air pockets. Now you should have room to add a bit more rice to the bottle.
Once you've added a bit more rice, stick the chopstick back into the bottle. This time, when you pull up on the chopstick, you should be able to pick up the whole bottle.