Advertisements
Advertisements
प्रश्न
Complete a sentence and explain it.
The working of a rocket depends on Newton's ______ law of motion.
उत्तर
The working of a rocket depends on Newton’s third law of motion.
Explanation:
Newton's third law plays an important role in the acceleration of fire. When fuel is heated in a fire, a chemical reaction takes place and it burns. Free gases escape through a small hole in the tail on the ground side of the fireball. They exert an equal and opposite reaction force on fire. Due to this reaction force, the fire arrow accelerates forward.
APPEARS IN
संबंधित प्रश्न
If action is always equal to the reaction, explain how a horse can pull a cart.
Explain, why is it difficult for a fireman to hold a hose, which ejects large amounts of water at a high velocity.
Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?
According to the third law of motion, when we push on an object, the object pushes back on us with an equal and opposite force. If the object is a massive truck parked along the roadside, it will probably not move. A student justifies this by answering that the two opposite and equal forces cancel each other. Comment on this logic and explain why the truck does not move.
Is the following statement true or false :
A rocket can propel itself in a vacuum.
What is the force which produces an acceleration of 1 m /s2 in a body of mass 1 kg ?
Do action and reaction act on the same body or different bodies ? How are they related in magnitude and direction ? Are they simultaneous or not ?
If a man jumps out from a boat, the boat moves backwards. Why ?
Why is it difficult to walk on a slippery road ?
Draw a diagram to show how a rocket engine provides a force to move the rocket upwards. Label the diagram appropriately.
State Newton’s third law of motion and give two examples to illustrate the law.
Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hose pipe tends to go backward.
According to the third law of motion, action and reaction :
Give scientific reasons.
It is easier to stop a tennis ball as compared to a cricket ball when both are travelling with the same velocity.
While catching a cricket ball the fielder lowers his hands backwards. Why?
“Wearing helmet and fastening the seat belt is highly recommended for safe journey” Justify your answer using Newton’s laws of motion.
Consider a frame that is made up of two thin massless rods AB and AC as shown in the figure. A vertical force `vec"P"` of magnitude 100 N is applied at point A of the frame.
Suppose the force is `vec"P"` resolved parallel to the arms AB and AC of the frame.
The magnitude of the resolved component along the arm AC is xN.
The value of x, to the nearest integer, is ______.
[Given: sin(35°) = 0.573, cos(35°) = 0.819, sin(110°) = 0.939, cos(110°) = –0.342]