When an electric bulb is switched on, what energy transformation takes place?
Electric energy changes into light energy and heat energy.
An electric cell converts which form of energy into which other form?
Chemical energy gets converted into electrical energy.
Can kinetic energy of a body be negative?
No, because both m and v2 are always positive.
When an arrow is shot from its bow, it has kinetic energy. From where does it get this kinetic energy?
A stretched bow possesses potential energy on account of a change in its shape. When the arrow is released, the potential energy of the bow gets converted into the kinetic…
What type of energy is stored in the spring of a watch?
Elastic potential energy.
Out of a light and a heavy body having equal kinetic energy, which one will is move fast?
The lighter body because v = .
What is negative work.
Work done against friction is a negative work.
By what factor does the kinetic energy of a body increase when its speed is doubled?
By a factor of 4 (KE ∝ v2 ).
Name the two common forms of mechanical energy.
Kinetic energy and potential energy.