Mechanics and Dynamics MCQs

1. Newton’s First Law of Motion states that an object at rest will remain at rest unless: a) A force is applied b) The object is heated c) The object is cooled d) It is in a vacuum Answer: a) A force is applied 2. The unit of force in the International System of Units (SI) is: a) Joule b) Newton c) Pascal d) Watt Answer: b) Newton 3. What is the acceleration of an object in free fall near the Earth’s surface? a) 9.8 m/s² b) 1.6 m/s² c) 5 m/s² d) 0 m/s² Answer: a) 9.8 m/s² 4. The product of mass and velocity is called: a) Force b) Acceleration c) Momentum d) Energy Answer: c) Momentum 5. The rate of change of velocity is known as: a) Speed b) Displacement c) Acceleration d) Force Answer: c) Acceleration 6. A body moving in a circular path with a constant speed has: a) Zero acceleration b) Constant velocity c) Centripetal acceleration d) Tangential force Answer: c) Centripetal acceleration 7. The work done when a force of 10 N moves an object 2 meters is: a) 5 J b) 20 J c) 10 J d) 15 J Answer: b) 20 J 8. Kinetic energy of an object is given by: a) 1/2 mv² b) mgh c) Fd d) kx² Answer: a) 1/2 mv² 9. Potential energy of an object at height is given by: a) mgh b) 1/2 mv² c) Fd d) 1/2 kx² Answer: a) mgh 10. What is the unit of work in the International System of Units (SI)? a) Joule b) Newton c) Pascal d) Watt Answer: a) Joule