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A contact force? The answer really depends on the level of the question. Primary school answer: A pushing or pulling force, or a friction force occur when objects touch. High school answer: Same as above, but 'pushing' and 'pulling' would be replaced with positive and negative. Friction would be defined as a force that opposes motion, and would include air resistance and drag. University answer: Technically, there is no such force, as all forces act at a distance without touching. In fact, objects don't actually 'touch' one another at all. The outer electrons in an object's atoms will repel said electrons from another object's atoms through the electromagnetic force. This only makes it feel like the objects have come into contact with one another, when in fact they haven't.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoNo. Gravity is a force that does not require the two objects to touch.
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What are contact forces and which forces are contact?
Contact forces are forces that can only have an effect on objects that they touch, such as when you contact a box and apply force to move it. you might apply a contact force to bend, tear, stretch, compress, or twist and abject. Tension force, friction force, and elastic force are examples of contact forces.
A force that pulls objects towards each other?
At the macro level, there are only two forces that cause objects to be attracted toward each other:gravity applies to all objects; andmagnetism applies only to certain materials.
How can you say that gravitational force is a field force?
It is true that the force of gravity can be described as a force field. Any object having mass will create a gravitational attraction in all directions, with decreasing intensity as the distance from the object increases. Fields are like that. It is different from a force that results from being hit by a baseball, which is exerted only at a specific location.
This type of force needs to touch something to affect it?
A contact force, such as friction. If a car wheel wasn't on the ground there couldn't be friction. A non-contact force could be magnets, the two magnets don't need to touch to repel or attract :)
To every action force is there an equal and opposite reaction force that is the law of conservation of momentum?
No, that is Newton's Third Law of Motion. The Law of Conservation of Momentum is that within a contained set of objects, the total momentum never changes. Objects can only transfer energy to each other, they can never really "get rid" of it.
Are forces only exerted when objects touch each other?
No...
Do objects accelerate only when a force is exerted upon it?
yes
What is the name of the natural pulling force exerted by objects on one another?
One such force is gravity; basically, gravity is the ONLY force that affects ALL objects.
What is the force exerted by the object you are trying to move?
Its a reaction force, and is equal and opposite to your force, only it is acting on different objects, so the force is still unbalanced.
Is the mutual gravitational force exerted by a pair of objects affected by the nature of the inverting medium?
Inverting? I assume you mean the surrounding medium, or the medium in between. No; the gravitational force depends ONLY on the masses, and on the distance. Of course, anything between the two objects may exert forces OTHER than the gravitational force.
When a force is exerted on an object work is done only if the object?
Only if the object moves
Why is the work output less when a force is exerted at an angle than when the force is exerted parallel to the direction of motion?
Because only a part of force (see vector analysis) is being used to do the desired work.
How are curved blades better at slicing?
To cut, you need a force...Force = pressure/areaThe smaller the area, (as on the curved blade (hold it on a flat surface and only a small are will touch the surface compared to a flat blade)) the more force exerted on the item being cut the easier it is to cut...
Do action and reaction forces cancel each other?
Yes and no. They are equal in size and opposite in direction, but they are NOT exerted onto the same object. Each object exerts exactly one force and each object RECEIVES exactly one force. With only one force being exerted onto each object, there is nothing to be cancelled on each single object. Thus, they do not cancel, they simply exert themselves on different objects.
Which term is a pulling force exerted by solids?
Tension is a pulling force that is exerted by solids.
If two objects have an equal mass does a more dense object have a greater gravitational pull?
No. The gravitational force exerted by one massive object on others depends only on its mass. So long as you are outside of the object, its density is irrelevant.
What type of force exerts only a pulling force on objects?
The gravitational force is always attractive.
