8 Physics Questions

8 Physics Questions
1- What is the cause of the friction between 2 surfaces in contact?

2- Explain the statement: ” The magnitude of the frictional forces depends on the nature of the surfaces”. Use examples.

3- Explain the difference between the Force of Static Friction and the Force of Kinetic Friction. What of these forces is usually greater for the same pair of surfaces in contact?

4- The area of contact between a block of steel (Block 1) on a surface of steel is 20 cm^2. The area of contact between a second block of steel (Block 2) and the same surface of steel is 40 cm^2. Is the force of friction between the Block 2 and the surface greater than the force of friction between the Block 1 and the surface? Explain

5- A block of Copper rest in a surface of Steel

a. Go to Internet and find the coefficient of kinetic friction. (copy the url of the website where you found it)

b. if the mass of the block is 5 kg. Find the Weight of the block. What is the direction of the Weight?

c. Find the Normal Force. What is the direction of the Normal Force?

d. If the block is moving. Find the force of friction between the block and the surface of steel.

6- Michael is on an inclined plane. The coefficient of friction between Michael’s shoes and the surface is 0.53. Find the Maximum angle of the inclined planed to avoid Michael to slide down.

7- Michael has a mass of 67 kg. He is on an inclined plane with angle of 23 degrees. The coefficient to Kinetic Friction between Michael’s shoes and the inclined plane is 0.37, and the coefficient of Static Friction is 0.48. Find:

a. The Weight of Michael

b. The magnitude of the normal force Fn

c. The magnitude of the parallel force Fp

d. The magnitude of the force of friction Ff

e. Compare the magnitudes of the Ff and the Fp. Is Michael going to slide down along the inclined plane? Explain

8- Why is important the synovial fluid present in the joints of the human body?

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