work, power and energy

What do you think is happening to Tom?

• no potential energy

• potential energy is more

• kinetic energy is zero

• both potential energy and kinetic energy is existing

What do you think about this picture?

• Engine is about to explode

• has lot of horsepower

• no friction

• plenty of friction

What is the work done?

• zero

• non-zero

What kind of energy acts in this picture?

• Gravitational potential energy

• Elastic potential energy

• atomic energy

• Electrostatic energy

• potential energy is more for sphere

• potential energy is more for cart

• kinetic energy is zero for sphere

• both A and C

When force is 5 N and displacement is 20 m. what is the work done?

• 100 J

• 100 N

• 10 Nm

• both A and B

Work done is maximum when ___________

• Force is maximum

• Force and displacement are in opposite direction

• no force acts on the object

• when scalar product of force and displacement is maximum

Work done by a frictional force is

• negative

• positive

• zero

• none of the above

If a particle is rotating in a circle, which of the following is true?

• No work is done

• Particle has no acceleration

• velocity of particle is constant

• No force is acting on the particle

Potential energy is given by U= 5x² + 6x. what could be the for force?

• 100x + 6

• -10x - 6

• 10x + 3x²

• x + 3x²