Practice Pakistan questions with answers and explanations.
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For constant mass, Newton's second law becomes F=ma.
It links net force to acceleration.
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Interaction forces occur in pairs on different bodies.
They are equal in magnitude and opposite in direction.
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The x-component is A cosθ.
10 cos60° = 10×0.5 = 5.
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The y-component is A sinθ.
10 sin30° = 10×0.5 = 5.
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Vectors in the same direction add directly.
The resultant is 12+7 = 19 N.
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Opposite collinear vectors subtract in magnitude.
The resultant magnitude is |12-7| = 5 N.
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Use the Pythagorean theorem for perpendicular components.
Magnitude = √(3²+4²)=5.
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Percentage error is |48-50|/50×100.
The result is 2/50×100 = 4%.
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Move the decimal four places to the right to obtain 7.2.
Therefore the exponent is -4.
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A vector has both magnitude and direction.
Acceleration describes the rate and direction of velocity change.
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Both sides of a valid physical equation must have the same dimensions.
Dimensional analysis can reveal inconsistent formulas.
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The newton is derived from base units as kg·m/s².
Metre, kilogram, and second are base units.
