Quick Answer: Is Work Positive Or Negative Zero?

Can the Force be negative?

Forces can be positive or negative.

And forces which are aimed to the left are usually said to be in a negative direction.

So, to be more accurate, in the above diagram we should call F1 a negative force, that is, negative 20 Newtons, and we should call F2 a positive force, or positive 18 Newtons..

What is negative work class 9?

If the force and the displacement are in opposite directions, then the work is said to be negative. Negative work just means that the force and the displacement act in opposite directions. …

When work done on a body is negative?

The work done by a body can be negative when the force acts opposite to the direction of displacement. Work done by a force is positive if the applied force has a component in the direction of the displacement.

In which condition work done is maximum?

Work done in the isothermal reversible expansion of an ideal gas is maximum work. The conditions for maximum work are as follow: All the changes taking place in the system during the process are reversible.

What is negative work done with example?

Negative work: Negative work is performed if the displacement is opposite to the direction of the Force applied. Example: Work was done the gravity on a rocket going perpendicular upwards. Zero work: When force and displacement are perpendicular to each other, or when force or displacement is zero.

What does it mean when work is 0?

Work is zero if applied force is zero (W=0 if F=0): If a block is moving on a smooth horizontal surface (frictionless), no work will be done. Note that the block may have large displacement but no work gets done. Work is zero if Cos θ is zero or θ = Π/2.

Is work done scalar or vector?

Work has only a magnitude but no direction. The formula for work is written as a dot product of force and displacement. Therefore, work is a scalar quantity.

What is negative work example?

Negative work follows when the force has a component opposite or against the displacement. Negative work removes or dissipates energy from the system. Two examples: In pulling a box of books along a rough floor at constant velocity, I do positive work on the box, that is I put energy into the system.

Is work done can be negative?

Work is a measurement of energy, so it may seem odd to think that a work can be negative — but it can! Work is how much energy is done by a force over a distance.

Under what condition is work done zero?

The work is stated as zero when there is no displacement of any given object along a line of force.

What is the physical meaning of negative work done?

If the direction of motion and F| are opposite, then negative work is being done. This means that energy is transferred in the opposite direction. For example, if you try to push a car uphill by applying a force up the slope and instead the car rolls down the hill you are doing negative work on the car.

What is work done with example?

Positive Work: If a force relocates the object in its direction, then the work done is positive. The example of this type of work done is the motion of the ball dropping towards the ground where the displacement of the ball is in the direction of the force of gravity.

When work is positive or negative?

We saw that when the force and displacement are in the same direction, we call the work as positive. In the opposite direction, we call the work as negative.

What is the minimum work done?

If the applied force is in one direction and the displacement of the body is in the opposite direction, then work done is minimum as COS 180 is equal to minus one. This is the minimum possible work done and work done is maximum when force and displacement are in the same direction.

Why is work done negative?

1 J = 1 N m. Work can be either positive or negative: if the force has a component in the same direction as the displacement of the object, the force is doing positive work. If the force has a component in the direction opposite to the displacement, the force does negative work.

Why is force of gravity negative?

Any object affected only by gravity (a projectile or an object in free fall) has an acceleration of -9.81 m/s2, regardless of the direction. The acceleration is negative when going up because the speed is decreasing. The acceleration is negative when going down because it is moving in the negative direction, down.

What is the example of zero work?

1) A simple example of zero work is when you stand holding a bag in your hands and do not move it. Your hands apply a force on the bag to balance the force of gravity exerted on it but since there is no displacement of the bag, the work done on it by you (your force) and also the gravity is zero.