Test: Force And Pressure - 4

Solution: If we push or pull any object we use force to push or pull it. So... Force is both push and pull.

Solution: The strength of a force is expressed by its magnitude. The magnitude of a force is expressed in the SI unit of force called Newton. 1 Newton is the force which can make an object of 1 kilogram mass to move at a speed of 1 meter per second. The direction in which a force acts is also to be specified.

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The electric force between two charged bodies at rest is conventionally  called electrostatic force or Coulomb force.

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Magnetic forces are non - contact forces;  they pull or push on objects without touching them. Magnets are only attracted to a few 'magnetic'  metals and not all matter.

Solution: Force is the push or pull activity on an object. It has the following properties : 1) Force can change the direction of a moving object. For example, we can change the direction of a moving ball by kicking it in another direction. 2) Force can change the shape of an object. For example, we can change the shape of a paper by crumbling it. 3) Force can change the speed by making a moving object move faster. For example, we can change the speed of a ball by kicking it. 4) Force can stop or slow down a moving object. For example, we can catch a falling ball and can thus stop it from falling. 5) Force can move an object in rest. For example, we can move a chair by pulling it.

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Solution: Otto von Guericke was a German scientist, inventor, and politician. His major scientific achievements were the establishment of the physics of vacuums, the discovery of an experimental method for clearly demonstrating electrostatic repulsion, and his advocacy of the reality of "action at a distance" and of "absolute space".

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A lubricant is a substance, usually organic, introduced to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. It may also have the function of transmitting forces, transporting foreign particles, or heating or cooling the surfaces.

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The correct answer is B as force exerted per unit area is called pressure.

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If the force applied on the object is in the direction of its motion, the speed of the object increases. If the force is applied in the direction opposite to the direction of motion, then it results in a decrease in the speed of the object. Thus, a force may bring a change in the state of motion of an object. 

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Solution: Yes , the correct ans is true because without coming in interaction force cannot react.

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The Pascal is the Si unit of Pressure. Whereas the Si unit of force is  Newton. 
So, the given statement is false.

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To move an object faster it has to be pushed or pulled repeatedly. 

Pull:-  Applying force in a direction towards us is known as pull. 

Push:- Applying force in a direction away from us is known as push.