1) What is the work done by a constant force in rectilinear motion? a) U1-2 = F∆x b) U1-2 = (Fcosα)∆x c) U1-2 = (Fsinα)∆x​ d)  U1-2 = 0 2) Which of the following forces does not do work? a) Gravitational force b) Frictional force c) Normal force in horizontal motion d) Spring force 3) The principle of work and energy states that: a) Work done by a force is equal to the force multiplied by time b) Work done by all forces is equal to the change in kinetic energy c) Work done by conservative forces equals the change in potential energy d) The total energy of a system is conserved 4) A block of mass 10 kg slides down a frictionless incline of 30° from a height of 5 m. Using the work-energy principle, calculate the velocity of the block at the bottom of the incline. a) 5.0 m/s b) 7.7 m/s c) 9.9 m/s d) 12.1 m/s 5) A 5 kg block compresses a spring by 0.2 m. The spring has a constant k=100N/m. If the spring is released, calculate the velocity of the block as it leaves the spring, assuming no friction. a) 0.89 m/s b) 1.26 m/s c) 2.00 m/s d) 2.83 m/s 6) In a spring, when does the work of the spring force become positive? a) When the spring is stretched b) When the spring is compressed c) When the spring returns to its undeformed position d) When the spring is at equilibrium 7) What is the unit of work and energy in SI units? a) Newton (N) b) Joule (J) c) Watt (W) d) Pascal (Pa) 8) The impulse of a force is given by: a) F × t b) F × v c) ∫ Fdt d) ∫ mdv 9) Which of the following scenarios involves an impulsive force? a) A rocket in steady flight b) A car slowing down gradually c) A baseball hit by a bat d) An elevator moving at constant velocity 10) The principle of impulse and momentum is particularly useful when dealing with: a) Long duration forces b) Conservative forces only c) Short-duration, large forces d) Frictionless surfaces

Dynamic Quiz

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