CBSE Class 11-science Physics Conservative Forces
- What are conservative and non-conservative forces. Give one example of each force.
- Why a coolie does no work when he moves on a level road while carrying a box on his head?
- Write four properties of conservative forces.
- Explain that gravitational force is a conservative force.
- Calculate the velocity of the bob of simple pendulum at its mean position if it is able to rise to vertical height of 20 cm. Take g = 9.8 m/s2.
- Find the maximum compression in a spring of spring constant 800 N/m, if it is hit by a ball of 0.5 kg released from the height of 10 m. The ball initially followed a curved path and then move horizontally on a frictionless surface to meet the target.
- A ball at rest is dropped from a height of 10 m. It loses 25% of its kinetic energy in striking the ground. Find the height to which it bounces. Give the reason of loss of kinetic energy.
- A ball of mass 0.1 kg is thrown vertically up with a velocity of 10 m/s. At what height, will its kinetic energy be half its original value?
- 250 joules were spent in lifting a 10 kg weight to a height of 2 m. Calculate the acceleration with which it was raised. (Take g = 10 m/s2)
- A skater starts from rest on a frictionless hill with vertical height of 50 m and an inclination of 30o. Calculate how far the skater can go horizontally after he reaches the bottom of the hill, if the coefficient of the kinetic friction between the skis and snow is 0.21.
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