Laws of Motion
ICSE · Class 9 · Physics
Flashcards for Laws of Motion — ICSE Class 9 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allState the general definition of force.
Answer
Force is that physical cause which changes or tends to change either the size or the shape or the state of rest or of motion of the body.
What are contact forces? Name four examples.
Answer
Contact forces are applied on bodies by making a physical contact. Examples: frictional force, normal reaction force, tension force in a string, and force exerted during collision.
What are non-contact forces? Name three examples.
Answer
Non-contact forces are experienced by bodies even without being physically touched. Examples: gravitational force, electrostatic force, and magnetic force.
Why is gravitational force always attractive, while electrostatic and magnetic forces can be attractive or repulsive?
Answer
Gravitational force is always attractive because masses attract each other. Electrostatic force depends on charges: unlike charges attract and like charges repel. Magnetic force depends on poles: unli…
State Newton's first law of motion.
Answer
According to Newton's first law of motion, if a body is in a state of rest, it will remain in the state of rest and if it is in the state of motion, it will remain moving in the same direction with th…
What is inertia?
Answer
Inertia is the property of an object by virtue of which it neither changes its state nor it tends to change the state. It is the inherent property of each object.
Why does a passenger in a train tend to fall backward when the train suddenly starts?
Answer
This happens due to inertia of rest. The lower part of the body moves with the train first, but the upper part tends to remain at rest for a short time. Because of this, the person leans backward. Thi…
Why does a cyclist continue moving for some distance after pedalling stops?
Answer
This happens due to inertia of motion. The bicycle keeps moving with the same speed for a short time, but friction between the tyres and the road slowly stops it. If friction were absent, the bicycle …
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