The K. E of a moving object equals one-half the product of its mass, and the square of its velocity. Since the mass of an object can never be zero and the square of velocity makes the answer positive. Therefore, Kinetic energy can never be negative. E is equal to half of the product of its mass and the square of its velocity. In addition, Kinetic energy is the energy possessed by a body due to its motion. The more the speed and mass of the moving body, the more is its K.
Units of Kinetic Energy. Translational K. Mass is the amount of matter contained within an object and velocity is the speed of a moving object in a particular direction. Rotational K. Moment of inertia is the angular mass or rotational inertia of a rigid body and angular velocity is a vector measure of rotation rate. Types of Kinetic Energy.
Work is a force acting on an object in the direction of motion. It is the product of Force F and displacement S in the direction of the force. It is a scalar quantity and its unit is Joule. As body possesses K. E and is capable to do work against opposing force F until it stops and loses all of its K. In this case, Kinetic energy equals the work done by the body.
The initial velocity vi of the body is v and the final velocity v f is zero. Since velocity is a vector quantity, it can be negative. A positive velocity denotes that the object is traveling in the positive direction as defined by the coordinate system, whereas a negative velocity denotes that the object is moving in the opposite direction.
Simply said, when velocity turns negative, it is the speed in the opposite direction. Example 2: Find the Kinetic energy of an object of mass two-kilogram moving at a speed of one meter per second. How much is the K.
E of the object at the time it strikes the ground? Can kinetic energy be negative in this case? E is positive. As for potential energy, it is a matter of reference mostly. Also could you explain your views on negative potential energy.
When you say matter of reference, you mean frame of reference? Could you give some examples where it is positive and where it is negative. Think of gravity for example. Often we define 0 gravitational potential energy as being at ground level. Now imagine digging a hole. You have managed to go below ground level. You could redefine the potential as 0 at this new lowest point, but that would require changing other work as well.
It is just as accurate to say it has negative potential energy. It just means there is a state below your reference that is available. That said, I don't really see how that would apply to kinetic energy either.
Show 3 more comments. Active Oldest Votes. Improve this answer. Yukterez Yukterez 7, 1 1 gold badge 22 22 silver badges 46 46 bronze badges. Negative mass. Never even thought of that. Add a comment. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.
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