What is ramp ! What is it use ! Pushing an object up a ramp is usually easier !
ID: 1351249 • Letter: W
Question
What is ramp ! What is it use !
Pushing an object up a ramp is usually easier ! Explain
Shallow ramps require only gentle pushed ! Explain
The steeper the ramp, more force is needed to push a body up . Explain
What do you mean by support force ?
What do you mean by positive , nagitive and zero work done ?
give examples of positive , nagitive and zero work done !
Distinguish between work and energy !
Distinguished between kinetic energy and gravitational potential energy. Give example
Distinguished between chemical potential energy and elastic potential energy. Give example
State conservation of energy . Give an example energy transformation
Explanation / Answer
A ramp is a sloping surface connecting two areas of different levels.
Ramps are used instead of staircases in some buildings for use by people who move about in wheelchairs or to be carried on stretchers. A road that leads on to or off from a main road is also a ramp. In airports the movable staircase that passengers use to board the plane and get off from the plane is a ramp.
It is *not* always easier to pull a heavy object than to push it .
It depends on the direction
of the application of the force with respect to the friction or opposing force . If you are pushi
ng down , like in case of hand cart , the vertical component of the applied force is was
ted in increasing friction . If you pull the vertical component effectively reduces the weight of the object and thus the friction . So in this case pulling is easier than pushing because the point of application of force is above that of deployment of the effect .
Do observe the ants . They are very small creatures , so everything they transport is generally much larger than their size . So they have to apply the force from down to up . You will see ants always push large objects and do not pull them . In *their* case the vertical component of push effectively reduces the friction .
The weight of the object is the object's mass times gravity which is the force of gravity on the book. The table being the normal force, the force perpendicular to the force will be equal to the weight of the book. Fn-Fg=0
Work is force x distance ( or more accurately, force x distance x cos , where is the angle between force and direction of movement) . When force and distance are in the same direction it is said to be positive work. For example if you a push a box towards the right side, and it moves to right , then you have done positive work on the box.
When force and distance are in opposite directions , negative work happens. For example, if a car is being pushed towards the right by a truck with a force of 1000 Newtons, and you try to stop the moving car, and apply a force of 100 N towards the left, obviously the car will keep moving to the right, because there is a net 900 N force on it towards the right. Also offcourse you will keep sliding with the car towards the right. In this case, you apply a force towards the left on the car, but the car moves in the right direction, both are opposite, so you have done negative work on the car. And the truck has done positive work on the car, since the force by the truck is in the same direction as the movement of the car.
Zero work happens when force and distance are perpendicular. So if you sit on the top of the car, which is being pushed by a truck to the right, you are applying a downward force on the car because of your weight, but the movement of the car is not downwards but towards the right. So here, your applied force on the car is proportional to the movement of the car, and so you have done zero work on the car. If you push against a wall, you exert a force on it, but because the wall doesn’t move, you have not done any work. I know this sounds weird because obviously you have exerted effort, but in science, work is only force x distance ( force. distance , which is basically the dot product of the force and distance vectors).
WORK AND ENERGY: In physics, work is the transferring of an energy’s amount via a force through a distance via the direction of the force. The word “work” was first coined by Gaspard Coriolis. He is a French mathematician. He coined this word during 1826. The SI unit of physics is joules.
Energy, on the other hand, came from the Greek word “energeia” meaning “activity or operation.” It was used in one of Aristotle’s works in as early as the 4th century BC. Work is said to be the ability of someone or something to engage or do work. On the other hand, energy is defined as the force which acts in a certain distance. Energy is all defined as the ability to push or pull by exertion in a certain path or distance. Energy is also measured in joules.
Energy and work are said to be scalar units. “Scalar” means it does not have any direction. It is not tangible as well. We cannot see it nor feel it. We usually use energy in describing how different things behave on their own. Examples of energy are nuclear energy, solar energy, electrical energy, and a lot more. In energy, there are two types that are frequently used such as kinetic energy and potential energy.
kinetic energy and gravitational potential energy.:Kinetic energy represents energy of motion. Any object which is moving relative to you, will have kinetic energy. An example would be a bullet fired from a gun.
Gravitational potential energy occurs when something is lifted up above some reference point (ie the ground). After it is lifted, it can be dropped, at which point it's potential energy will turn into kinetic energy as it speeds up. An example would be water at the top of a waterfall.
chemical potential energy:Chemical energy is the energy due to associations of atoms in molecules and various other kinds of aggregrates of matter. It may be defined as a work done by electric forces during re-arrangement of electric charges, electrons and protons, in the process of aggregration.
elastic potential energy:Elastic potential energy is Potential energystored as a result of deformation of an elasticobject, such as the stretching of a spring. It is equal to the work done to stretch the spring, which depends upon the spring constant k as well as the distance stretched
conservation of energy:
The conservation of energy principle states that energy can neither be destroyed nor created. Instead, energy just transforms from one form into another. So what exactly is energy transformation? Well, as you might guess, energy transformation is defined as the process of changing energy from one form to another.
1. A toaster transforms electrical energy into thermal energy.
2. A blender transforms electrical energy into mechanical energy.
3. The sun transforms nuclear energy into ultraviolet, infrared, and gamma energy all forms of electromagnetic energy.
4. Our bodies convert chemical energy from food into mechanical and electrical energy to allow us to move.
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