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 allWhat is force? List its two main effects on a body.
Answer
Force is a physical cause that changes or tends to change either the size, shape, or state of rest or motion of a body. Two main effects: (1) It can change the state of rest or motion of the body (2) …
Distinguish between contact forces and non-contact forces with two examples each.
Answer
Contact forces: Applied by making physical contact. Examples: (1) Frictional force (2) Normal reaction force. Non-contact forces: Experienced without physical touch. Examples: (1) Gravitational force …
State Newton's First Law of Motion.
Answer
A body at rest remains at rest, and a body in motion continues to move with the same speed in the same direction, unless acted upon by an external force.
What is inertia? Name its two types with one example each.
Answer
Inertia is the property of a body to resist change in its state of rest or motion. Types: (1) Inertia of rest - a passenger falls backward when a train suddenly starts (2) Inertia of motion - a cyclis…
Why does a coin fall into a glass when a card beneath it is quickly flicked away?
Answer
When the card is flicked quickly, it moves away due to the applied force. However, the coin remains at its original position due to inertia of rest. As the card moves away, the coin falls into the gla…
Define linear momentum and write its formula with SI unit.
Answer
Linear momentum is the product of mass and velocity of a body. Formula: p = mv. SI unit: kg m s⁻¹ (kilogram meter per second)…
State Newton's Second Law of Motion in terms of momentum.
Answer
The rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction of the force. Mathematically: F = Δp/Δt…
Derive the relation F = ma from Newton's Second Law.
Answer
From F = Δp/Δt = Δ(mv)/Δt. When mass is constant: F = m(Δv/Δt) = ma, where a is acceleration. This shows force equals mass times acceleration.
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