Physics...AHHH Im so confused on this second law stuff plz help!!!?

Question: 1. What is the magnitude of the acceleration of a 2 kg object when the net force on the object is 10 N? A. 10 m/s2 B. 5 m/s2 C. 20 m/s2 2. Suppose with 200 N of force applied horizontally to your 1 500 N refrigerator that it slides across your kitchen floor at constant velocity. The friction forces on the floor against the refrigerator must be _______. A. greater than 1500 N B. 200 N C. 1 500 N D. zero E. 1 300 N 3. kg m/s2 is a valid unit for _______. A. velocity B. weight C. acceleration D. mass 4. The weight of an object: A. is the force with which it is attracted to the earth. B. does not change if the object is on the surface of the earth or on the moon. C. is a measure of its inertia. D. none of the above. E. is the quantity of matter it contains. 5. An object is moving along in a straight line. If its net force were doubled what will happen to its acceleration? A. It will stay the same. B. It will quadruple. C. It will halve. D. It will double. 6. The force that actually accelerates an automobile forward is: A. the force applied to the wheels by the road. B. the force applied to the road by the wheels C. the force applied to the car by the motor. D. the force applied to the wheels by the driver. 7. A force is a vector quantity because it has both __. A. action and reaction counterparts B. magnitude and direction C. mass and acceleration 8. John weighs 100 N on Earth and Mary weighs 100 N on the Moon. A. John and Mary are both adults. B. Mary is a child and John is an adult. C. John is a child and Mary is an adult. D. John and Mary are both children.

Answer: 1. Use F = ma 10 = 2a a = 5ms^-2 2. Since the object moves at a constant velocity net force acting on it must be zero. Therfore the applied force is equal to friction i.e. friction = 200 N 3. kg m/s^2 is unit of mass x acceleration. i.e. Force. Weight is also a force. Therefore answer is weight 4. is the force with which it is attracted to the earth. 5. It will stay the same. Moving along a straight line means net force is zero. (Newtons first law). Doubling 0 is results in 0. A tricky question!! 6. the force applied to the wheels by the road. 7. magnitude and direction 8. John is a child and Mary is an adult. A person weighs less on moon than he does on earth. Thereofre Marry definitely weighs more than 100N on earth.

Related Questions

Related Items