Advertisements
Advertisements
प्रश्न
Complete the analogy.
Kicking a ball: Contact force:: Falling of leaf: ______?
उत्तर
Kicking a ball: Contact force:: Falling of leaf: Non-contact force?
APPEARS IN
संबंधित प्रश्न
Classify the following amongst contact and non - contact forces:
Frictional force
Normal reaction force
Force of tension in a string
Gravitational force
Electrostatic force
Magnetic force
Give one example in each case where :
The force is of contact, and
Force is at a distance
Name the S.I. unit of force and define it .
A car of mass 800 kg, moving at 54 kmh−1 is brought to rest over a distance of 15 m. Find the retarding force developed by the brakes of the car.
A cricket player holds a cricket ball of mass 100 g by moving his hands backward by 0.75 m. If the initial velocity of the ball is 108 kmh−1, find the retarding force applied by the player.
State four effects which a force can bring about. Give two examples in each case.
Multiple Choice Question. Select the correct option.
Action-reaction forces
During dry weather, clothes made of synthetic fibre often stick to the skin. Which type of force is responsible for this phenomenon?
Does the force of gravitation exist between two astronauts in space?
Two persons are applying forces on two opposite sides of a moving cart. The cart still moves with the same speed in the same direction. What do you infer about the magnitudes and direction of the forces applied?
