Carmen asked in Science & MathematicsPhysics · 4 weeks ago

# Kinetic Energy or Potential Energy?

Which of these examples would either be Kinetic Energy and which would be Potential Energy:

1. A plane travelling on the runway.

2. A diving board with a diver standing on the end.

3. A basketball player dribbling a ball.

4. A pop can blowing in the wind.

6. A bird sitting on a telephone wire.

Thank you!

Relevance
• goring
Lv 6
3 weeks ago

A bouncing basket ball is a collision phenomenon. The basket ball collides with the ground and then bounces back up but not at the same height it started with. That means the ball lost energy during collision.This is called inelastic collision.

Basically all collision are inelastic except for the particle of light whose volume is invariant.

• 4 weeks ago

1. A plane travelling on the runway. KE

2. A diving board with a diver standing on the end. PE

3. A basketball player dribbling a ball. KE & PE

4. A pop can blowing in the wind. KE & possibly PE

5. A basketball bouncing.  KE & PE

6. A bird sitting on a telephone wire. PE

===

By the way, I am assuming your frame of reference is from the earth's surface.

Why is this important?? The earth is rotating at nearly 1000miles per hour, The earth is also in orbit around the sun at 67,000 miles per hour. In a global reference, something standing still on earth actually has KE.

• 4 weeks ago

there is always some potential energy so it isn't exactly a case of either-or, BUT if you have an object in motion, it will have kinetic energy, so all the examples which describe an object in motion can be considered in terms of a non-zero kinetic energy.

The things just sitting there (like the bird) will have 0 kinetic energy (relative to the reference frame), so you would normally only worry about the potential energy, energy which could come if forced to change location or circumstances, or be necessary to make such a movement happen.

Everything is in motion in terms of the universe, but we normally only consider movement relative to some reference point, which is typically the "unmoving" ground at a location.  The ground is actually moving so we move with it, and that means that the ground has kinetic energy, and so do we, but we just ignore that constant condition for most purposes.  We only worry about things that matter on the scale we are considering; things that can be changed.

• 4 weeks ago

First of all, kinetic energy is the energy a particle or a body possesses by virtue of its motion. Provided the body is moving, it has kinetic energy. Example is a moving car. Whereas potential energy is the energy a particle or a body possesses by virtue of its position above the ground. Example is a ball held up high. There are cases where a body could both be experiencing kinetic and potential energies at the same time and that's mechanical energy. Example is a fruit falling from a tree. Hence Mechanical energy is more like kinetic energy + potential energy. From this explanation I hope you can easily figure out what energy a body possesses in what state.

• oubaas
Lv 7
4 weeks ago

4) ; 5) all the others are just one or the other, but not both

• 4 weeks ago

If something is NOT moving then it cannot contain KINETIC energy.

2 and 6 have NO kinetic energy.

We generally take that ground level has zero potential energy.

1 and 4 are at the ground and have NO potential energy.

Everything else must have both.

• Argent
Lv 7
4 weeks ago

Anything moving (such as the plane, the basketball player and ball, or the can) has kinetic energy.

Anything stationary above the ground (such as the diver and board, or the bird) has potential energy.

Anything moving vertically (such as the basketball, or perhaps the can if the wind is also lifting it instead of just pushing it) has a combination of kinetic and potential energies.