Table of Contents
How can work done by friction be positive?
The work done by frictional force will be positive when the displacement of the body is in the direction of the force. Since, the direction of motion of the block and the direction of frictional force is opposite to each other, the work done by friction is negative. The work done by friction can also be zero.
How is friction positive and negative?
Friction only does one thing, it opposes the motion. When this effect beifits us it is positive effect such as ability to hold something in hand, walking, etc whereas negative effects includes resistance to motion, wear and tear, heat generation etc.
Why is work done always negative?
Work done by a force applied on a body is: When the direction of motion of the body and the force acting on the body is opposite, work done is negative. When the force is acting at a right angle to the direction of motion of the body, work done is zero.
Why is the work done by friction negative?
Insight: Kinetic friction always does negative work because the force is always opposite to the direction of motion.
Is work done by friction?
Friction does negative work and removes some of the energy the person expends and converts it to thermal energy. The net work equals the sum of the work done by each individual force.
Can the work done by the force of kinetic friction on an object ever be positive if yes give an example if no explain why not?
The rug can be pulled so that it always moves faster than the objects, so while the objects are “moving forward” relative to ground, they are actually sliding back on the rug, hence the friction is kinetic and it “drags” the object forward faster so it’s doing positive work. Yes.
When work is positive means work done?
Positive work done – The work done is said to be positive when force and displacement are in the same direction. Hence, work is positive. Zero work – the work done is said to be zero when force and displacement are perpendicular to each other.
Can work done be positive?
Excellent. Now, if the force and displacement happen to be in the same direction, that’s when we say work done is positive, it’s a positive number.
Can work done by kinetic friction is positive?
Yes. Work is a directional quantity, so if the work done by friction occurs in the same direction that you have designated as the positive direction, the work done will be positive.
Is work done by friction is always negative justify your answer?
yes, work done by friction is always either zero or negative. This is due to these facts. 2) since friction always opposes the motion of an object, the frictional force’s direction will always be opposite to the direction of the motion of the object.