Admin Table of Contents
- 1 What happens when energy is used to apply a force to an object?
- 2 What is the force against gravity called?
- 3 When we say work is done against a force we mean the force does?
- 4 What is work done against gravity give an example of it?
- 5 What is work against friction?
- 6 What do you mean by work done against a force give one example?
- 7 How is energy related to motion and force?
- 8 How do you calculate the work done by objects against gravity?
- 9 Why is gravity a force of attraction?
What happens when energy is used to apply a force to an object?
That is, its mechanical energy enables that object to apply a force to another object in order to cause it to be displaced. Numerous examples can be given of how an object with mechanical energy can harness that energy in order to apply a force to cause another object to be displaced.
What is the force against gravity called?
Anti-gravity (also known as non-gravitational field) is a hypothetical phenomenon of creating a place or object that is free from the force of gravity.
When we say work is done against a force we mean the force does?
The work done by the force F1 is done against a force F2 when the forces F1 and F2 are directed in opposite sides one to other. So when we say work is being done against a force, we are simply saying that work is being done on a force in the presence of another force which is directed in the opposite direction.
What happens to the energy of the ball doing the work and the bottle on which work is done?
When work is done by an object it loses energy and when work is done on an object it gains energy. A moving object has energy called energy of motion or kinetic energy.
What is caused by the energy of motion?
Kinetic energy is the energy of motion. All moving objects have kinetic energy. When an object is in motion, it changes its position by moving in a direction: up, down, forward, or backward. 3. A force is a push or pull that causes an object to move, change direction, change speed, or stop.
What is work done against gravity give an example of it?
Figure 5 (a) Placing a suitcase on a luggage rack involves doing work against gravity. So if an object of mass m is raised through a height h, the work done on the object is equal to mgh, and so this amount of energy is transferred to the object. …
What is work against friction?
When you move something that has a resisting force, like friction, then not all the energy you put in (work done) goes to kinetic energy. Some of the energy is lost to friction and dissipated as heat. That is called work done against friction.
What do you mean by work done against a force give one example?
Work is done when a force is applied to an object and the object is moved through a distance. For example, when you lift a load you are applying a force over a distance so you are doing work….but gravity is against your force.
What happens to the energy of the one doing the work and to the object on which work is done?
When work is done on a system or object, energy is added to it. When work is done by a system or object, it gives some of its energy to something else. By applying a force on the ball over this distance, the hand is doing work on the ball, and the ball gains kinetic energy. This is what gives it speed.
What is the energy of movement?
Kinetic energy is the energy of motion. All moving objects have kinetic energy. When an object is in motion, it changes its position by moving in a direction: up, down, forward, or backward. Potential energy is stored energy.
Bigger pushes and pulls cause bigger changes in an object’s motion or shape. When objects collide, contact forces transfer energy so as to change the objects’ motions. When two objects interact, each one exerts a force on the other, and these forces can transfer energy between them.
How do you calculate the work done by objects against gravity?
The force they exert = mg and the distance over which they exert it = h. Work = mgh. If they exert a force greater than mg, then the work they do ‘against gravity’ would be the same, but they will be doing additional work to increase the kinetic energy of the box.
Why is gravity a force of attraction?
Any two objects that have mass attract each other with a force we call gravity. You probably never noticed this for small objects, because the force is so weak. But the Earth has lots of mass, and so it exerts a big gravitational force on you. We call that force your weight. The fact that gravity is actually a force of attraction is not obvious.
How is the force a person exerts against gravity greater than mg?
If they exert a force greater than mg, then the work they do ‘against gravity’ would be the same, but they will be doing additional work to increase the kinetic energy of the box. Also, how is the force the person exerts=mg. Technically, the gravitational force=mg.
What is the opposing force of gravity on Earth?
The opposing force is the gravitational force exerted by the person onto the earth equal in magnitude (Newton’s Law of Gravity). This force produces an acceleration (Newton’s Second Law) but because the mass of the earth is massive as compared to the human body, it is relatively small and can be taken as zero.