Question 1:
Which type of friction occurs when an object rolls over a surface?
Explanation: The correct answer is A) Rolling friction. Rolling friction occurs when an object rolls over a surface. It opposes the rotational motion of the object and depends on factors such as the nature of the surfaces in contact and the shape of the object.
Question 2:
Which type of friction occurs when an object slides over a surface?
Explanation: The correct answer is B) Sliding friction. Sliding friction occurs when an object slides over a surface. It opposes the relative motion between the object and the surface it is in contact with. The magnitude of sliding friction depends on factors such as the nature of the surfaces and the normal force.
Question 3:
Which type of friction is generally greater in magnitude: rolling friction or sliding friction?
Explanation: The correct answer is A) Rolling friction. In general, rolling friction is greater in magnitude than sliding friction. Rolling friction involves the deformation of materials and the generation of heat, which can result in a higher frictional force compared to sliding friction.
Question 4:
Which factor does not affect rolling friction?
Explanation: The correct answer is C) The relative velocity between the surfaces. The factors that affect rolling friction include the nature of the surfaces in contact, the area of contact, and the shape and size of the object. However, the relative velocity between the surfaces does not directly affect rolling friction since rolling motion does not involve sliding or relative motion between the surfaces.
Question 5:
Which type of friction is generally easier to overcome: rolling friction or sliding friction?
Explanation: The correct answer is A) Rolling friction. Rolling friction is generally easier to overcome compared to sliding friction. This is because rolling motion involves less surface area in contact and results in less resistance. Rolling friction allows objects like wheels to roll smoothly with less energy loss compared to objects sliding over a surface.