What are the two essential conditions for work done by a force acting on an object?
For work to be done, it is essential that some force is applied to the object and the object displaces from its initial position. If these two conditions are satisfied, then the work is done. So, work done= force x displacement or w= f x s.
What is an unbalanced force give two examples?
Practically anything that moves is a result of the exertion of unbalanced forces on it. If you kick a football and it moves from one place to another, it means that unbalanced forces are acting upon it. Ball moves from one place to another after kicking it. This is an example of unbalanced force.
What is the work done in holding a 15 kg suitcase while waiting for 15 minutes?
What is work done in holding a 15kg suitcase while waiting for a bus for 15 minutes ? Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams. Work done is zero, because displacement is zero.
Is work done against the force of gravity?
Work done by a body is against the applied force if the displacement is in a direction opposite to the force. In the case of gravity, if a body is lifted above the ground, work is done against gravity.
Why might the water be able to move up against gravity like that?
Water is able to soak up against the force of gravity all thanks to a little help from capillary action. Water is wet. If the adhesive force is greater than the cohesive force, the molecules at the sides will try to hug the container, which causes the curved meniscus at the surface.
What is the difference between cohesive and adhesive force?
A strong adhesive force tends the liquid to spread over the surface whereas a strong cohesive force is responsible for the formation of water droplets on the water surface. The adhesion and cohesion forces, both vary in their strengths.
Is water cohesive or adhesive?
Adhesion makes a water drop a drop. Water is highly cohesive—it is the highest of the non-metallic liquids. Water is sticky and clumps together into drops because of its cohesive properties, but chemistry and electricity are involved at a more detailed level to make this possible.
What is called force of cohesion?
Cohesion, in physics, the intermolecular attractive force acting between two adjacent portions of a substance, particularly of a solid or liquid. It is this force that holds a piece of matter together. Intermolecular forces act also between two dissimilar substances in contact, a phenomenon called adhesion.
Why does cohesion occur in water?
Cohesion refers to the attraction of molecules for other molecules of the same kind, and water molecules have strong cohesive forces thanks to their ability to form hydrogen bonds with one another. Thus, the water molecules at the surface form stronger interactions with the neighbors they do have.