# Energy

posted by .

Without energy we can't do work cuz we can't apply ne force on an object. Gravity, itself a force, when, say, pulls a ball down to the gorund it actually does work. Now for that force, where does it get the energy from or what type of energy does it have?

If u have a book opened n u hold a page up frm it n then leave it so that it slides down to it's original poisition, has work been done by the gravity?

The work gravity does is increasing the kinetic energy of the falling object, dissipating that kinetic energy into heating and moving air (air friction).

I am not certain what your second question is, it is far from standard English. When one separates two objects, one does work against gravity, when the objects come closer, gravity does work.

• Energy -

fsd

• Energy -

Ksidido

## Similar Questions

1. ### physics

because of friction, a constant force of 20 N is needed to slide a box across a room to the right at a constant speed, and box is moved 3 m. What is the friction force and how much work is done by friction force?
2. ### physics

A block is moving down an incline a distance of 5 m form point A to point B by a force F that is parallel to the incline and has magnitude 2 N. The magnitude of the frictional force acting on the block is 10 N. If the kinetic energy …
3. ### Physics

1.when a train pulls a wagon, is the work zero because wagon pulls on the train with equal opposite force(newton's third law)?
4. ### physics

If there is just one force acting on an object, does its work necessarily result in an increase in kinetic energy?
5. ### physics

If there is just one force acting on an object, does its work necessarily result in an increase in kinetic energy?
6. ### physics

Which of the following statements about work is or are true?
7. ### physics

my answer for these are 1. a 2.c 3 d but not sure so please anyone see if i am correct 1. In which of the following cases is work done on the object?
8. ### physics

What does it mean to say the Coulomb Force is a conservative force?
9. ### physics

7. No work is done by gravity on a bowling ball resting or moving on a bowling alley because the force of gravity on the ball acts perpendicular to the surface. But on an incline, the force of gravity has a vector component parallel …
10. ### PHYSICS

Hooke's Law: 1.) If it takes 10 N to compress a spring 20cm, how much energy will be stored in the spring when it is stretched 50cm. ***Also, for ex: If I am doing work against a restoring force, say, doing work against gravity, what …

More Similar Questions