Question

which of the following is a characteristic of friction a) it is a non contact force b) it works opposite to direction of motion c) it can change the direction of motion d) it works on only resting body​

Answer 1

B. A characteristic of friction is "it works opposite to the direction of motion".

Characteristic of friction:

• Friction between systems is always parallel to the contact surface and always resists motion.
• The attempted relative mobility of the systems.
• As a surface roughness increases, so do the friction.
• When the weight remains constant, friction is independent of the area of the surface in contact.

The opposite direction of motion:

• Keep in mind that, while acceleration always occurs in the direction of velocity change, it does not always occur in the direction of motion.
• The acceleration of a slowing object is in the opposite direction of its velocity.
• This is referred to as deceleration.

Answer 2

Answer:

a) it is a non contact force