Advertisements
Advertisements
प्रश्न
Complete a sentence and explain it.
The working of a rocket depends on Newton's ______ law of motion.
Advertisements
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
Explain, why is it difficult for a fireman to hold a hose, which ejects large amounts of water at a high velocity.
A stone of 1 kg is thrown with a velocity of 20 m s−1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?
Is the following statement true or false :
A rocket can propel itself in a vacuum.
Fill in the following blanks with suitable words :
Forces in a Newton’s third law pair have equal _____________ but act in opposite _____________.
Why does a gunman get a jerk on firing a bullet ?
If a man jumps out from a boat, the boat moves backwards. Why ?
Explain why, a runner presses the ground with his feet before he starts his run.
Name the law involved in the following situation :
when person A standing on roller skates pushes another person B (also standing on roller skates) and makes him move to the right side, then the person A himself gets moved to the left side by an equal distance.
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.
According to the third law of motion, action and reaction
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]
Why do the action and reaction forces in a pair not cancel each other out?
A book is resting on a table. Which of the following is the correct reaction force to the gravitational pull of the Earth on the book?
Can action and reaction forces be noncontact forces?
