Motion in a Plane
Telangana Open School (TOSS) · Class 12 · Physics
Flashcards for Motion in a Plane — Telangana Open School (TOSS) Class 12 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is the difference between scalar and vector quantities? Give two examples of each.
Answer
Scalar quantities have only magnitude (e.g., mass, temperature). Vector quantities have both magnitude and direction (e.g., velocity, force). Example: 5 kg (scalar), 10 m/s east (vector).
How is a vector represented graphically?
Answer
A vector is represented by a directed line segment. The length shows magnitude on a scale, and the arrowhead indicates direction. The starting point is the tail, and the endpoint is the head.
When are two vectors considered equal?
Answer
Two vectors are equal if they have the same magnitude and direction. Parallel vectors of same length and direction are equal, regardless of position.
Define negative of a vector.
Answer
The negative of a vector has the same magnitude but opposite direction. For vector A, –A points in the opposite direction.
State the triangle law of vector addition.
Answer
If two vectors are represented by two sides of a triangle taken in order, their resultant is given by the third side taken in opposite order.
A force of 8 N and 6 N act at an angle of 90° to each other. Find the magnitude of the resultant force.
Answer
Formula: R = √(A² + B² + 2ABcosθ) Given: A = 8 N, B = 6 N, θ = 90°, cos90° = 0 Step 1: R = √(8² + 6²) = √(64 + 36) = √100 = 10 N Answer: 10 N…
Two vectors of magnitudes 10 units and 12 units are anti-parallel. Find A + B and A – B.
Answer
Anti-parallel means θ = 180° A + B = 10 – 12 = –2 units (direction of B) A – B = 10 – (–12) = 10 + 12 = 22 units (direction of A)…
What is the resultant of three vectors acting along the sides of a triangle in order?
Answer
The resultant is zero because the vectors form a closed triangle, meaning the tip of the last vector meets the tail of the first.
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