Resultant forces and work done

What is a resultant force?

The resultant force is the single force that represents the sum of all the forces acting on an object.

How is work done calculated?

Work done is calculated using the formula: Work = Force × Distance (W = F × d).

What is the unit of work?

The unit of work is the joule (J), where 1 joule = 1 newton meter.

How can you calculate the work done when a force is applied at an angle?

Work done = Force × Distance × cos(θ), where θ is the angle between the force and the direction of motion.

What is the relationship between force and displacement in calculating work?

The force applied over a displacement causes work to be done, and the amount of work depends on both the force and the displacement.

What happens when there is no displacement?

If there is no displacement, no work is done, even if a force is applied.

How is energy related to work?

Energy is transferred when work is done, and the amount of energy transferred is equal to the work done.

How is power related to work done?

Power is the rate at which work is done, and it is calculated as Power = Work / Time (P = W / t).

How do frictional forces affect the work done?

Friction converts some of the work into heat, reducing the efficiency of the energy transfer.

How does the angle of a force affect the work done?

A force applied at an angle does less work than a force applied in the direction of motion, as only the component of the force in the direction of motion does work.

What is mechanical advantage?

Mechanical advantage is the ratio of the force output to the force input in a machine.

What is the role of energy in doing work?

Energy is transferred when work is done, and the type of energy transferred depends on the nature of the work (e.g., kinetic or potential energy).

What is the significance of the direction of force in work done?

The direction of force must be in the same direction as the displacement for work to be done effectively.

What is an example of work done in everyday life?

Lifting an object from the ground to a shelf is an example of work done by applying force over a distance.

What is the difference between positive and negative work?

Positive work occurs when the force and displacement are in the same direction, while negative work occurs when they are in opposite directions.