Which of the following statements is correct about friction?Group of answer choicesFriction always acts in the opposite direction to the direction of motion of an objectFriction is measured in kilogramsFriction always acts in the opposite direction to the direction of motion of an objectFriction always acts on stationary objects
Question
Which of the following statements is correct about friction?Group of answer choicesFriction always acts in the opposite direction to the direction of motion of an objectFriction is measured in kilogramsFriction always acts in the opposite direction to the direction of motion of an objectFriction always acts on stationary objects
Solution
The correct statement about friction is: "Friction always acts in the opposite direction to the direction of motion of an object".
Friction is a force that opposes the motion of an object. It always acts in the direction opposite to the direction of motion. For example, if you slide a book across a table, the friction from the table acts against the book's motion, slowing it down.
Friction is not measured in kilograms. Kilograms are a unit of mass, not force. The standard unit of force (including friction) in the International System of Units (SI) is the newton.
While it's true that friction can act on stationary objects to keep them at rest (this is called static friction), it's not accurate to say that friction "always" acts on stationary objects. There are situations where there is no friction on a stationary object, such as if the object is floating in space.
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Which of the following statements about friction is TRUE?A. Friction opposes motion of objects.B. Friction occurs between non-rubbing surfaces.C. Friction causes moving objects to move faster.D. Friction acts in a direction similar to the direction of an object’s motion.2. Will it be easier for a person to push a table on a carpeted floorthan on tiled floor?A. No, because the carpeted floor is rough, so friction is lesser.B. No, because the carpeted floor is rough, so friction is greater.C. Yes, because the carpeted floor is smooth, so friction is lesser.D. Yes, because the carpeted floor is smooth, so friction is greater.3. When can we say that friction on a floor is greater?A. If the floor is wet.B. If the floor is tiled.C. If the floor is rough.D. If the floor is smooth.4. Which force causes a rolling ball to stop after a few seconds?A. frictionB. gravityC. magneticD. motion5. Why is difficult to move heavy objects on a rough surface?A. rough surface is slipperyB. there is no friction on a rough surfaceC. there is lesser friction on a rough surfaceD. there is greater friction on a rough surface6. When you are travelling along a road, how does the wet road affect friction?A. It increases friction.B. It decreases friction.C. It maintains friction.D. It increases and decreases friction.What I Know
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