What is a disadvantage of friction?
It causes wear and tear of materials
Friction is the force that opposes relative motion between two surfaces in contact.
While friction is useful for walking, gripping and braking, it also has several disadvantages.
A major disadvantage is that friction causes wear and tear of materials, because the rubbing of surfaces slowly erodes them.
'It increases speed' is wrong; friction actually opposes motion and tends to reduce speed.
'It improves machinery efficiency' is incorrect, because friction produces heat and energy loss, which lowers the efficiency of machines.
'It prevents objects from wearing out' is the opposite of the truth, since friction is a cause of wearing out.
Therefore, a clear disadvantage of friction is that it causes wear and tear of materials.
Which of the following statement is correct regarding force?
I. If an unbalanced force is applied on the object, there will be a change either in its speed or in the direction of its motion.
II. To accelerate the motion of an object, a balanced force is required.
What force acts in a rollercoaster ride?
A. Centrifugal
B. Centripetal
C. Gravitational
D. Normal
When an object moves in the circular path at the same speed then its speed is called -
Which of the following is difficult without friction?
The force of attraction between two objects of masses M and m which lie at a distance d from each other is inversely proportional to ______________.
What does friction cause to the screws, ball bearings and soles of the shoes?