Linear Kinetics1. Newton's first law focuses ona. action-reactionb. accelerationc. inertiad. gravitye. none of the above2. Which of Newton's laws is described by the equation F = ma?a. firstb. secondc. thirdd. fourthe. law of gravitation3. Which quantity is the same in space as on the earth?a. weightb. massc. gravityd. center of gravitye. moment of inertia4. When a sprinter uses starting blocks to enhance running performance, which of Newton's laws is best representedby the interaction of the sprinter and the blocks?a. action-reactionb. accelerationc. inertiad. gravitye. amplification5. What is the unit for weight in the International system?a. poundb. kilogramc. newtond. slug6. As the mass of an object increases, what happens to its inertia?a. It decreases.b. It increases.c. It stays the same.d. It weighs more.e. Mass and inertia are not related.7. Gravity can be defined asa. the force with which the earth pulls on an object's massb. the amount of force acting over a given areac. an object's mass per unit volumed. an object's weight per unit volumee. a buoyant force8. If an unbalanced horizontal force is applied to a body that is at rest, the body willa. stay at restb. stay at rest until the unbalanced force is removedc. accelerated. accelerate when the unbalanced force is removede. need more information to determine9. To start in motion an object sitting at rest on a horizontal surface, the horizontal force applied must bea. greater than the vertical forceb. less than the vertical forcec. greater than the weight of the objectd. less than the weight of the objecte. none of the above10. An unbelted victim in a car accident will continue to move in the same direction and with the same speed until thedashboard causes a change in motion. This best exemplifiesa. Newton's first law of motionb. Newton's second law of motionc. Newton's third law of motiond. the law of forcee. the law of action-reaction11. If a body of constant mass is traveling with a constant velocity,a. there must be no force acting on the bodyb. there must be no unbalanced force acting on the bodyc. there must be force acting on the bodyd. there must be an unbalanced force acting on the bodye. need more information to determine12. If the resultant acceleration of a 2 kg ball is 5.0 m/s/s horizontally, the resultant force must bea. 0.4 Nb. 2.5 Nc. 7.0 Nd. 10.0 Ne. need more information to calculate13. Amy is in-line skating. She is rolling forward (north) on a flat section of road at 10 m/s. Her mass is 50 kg. The rolling friction acting on the wheels of her skates is 10 N backward (south). Air resistance creates a 15 N force also acting backward (south) on her. If these are the only horizontal forces acting on Amy, what is her horizontal acceleration as a result of these forces?Correct Answer:14. Amy is speedskating. She is gliding forward (north) on the ice at 10 m/s. Her mass is 60 kg. The friction acting on the blade of her skate is 1 N backward (south). Air resistance creates a 5 N force also acting backward (south) on her. If these are the only horizontal forces acting on Amy, what is her horizontal acceleration as a result of these forces?Correct Answer:15. If a bag has a mass of 25 kg, how much force must you apply vertically to lift it off of a baggage cart?a. less than 250 Nb. 250 Nc. greater than 250 Nd. need more information to calculate16. The maximum limiting friction that can be generated between the bag and the cart is 50 N. You need to slide the bag to the side of the cart. If you apply 50 N horizontally on the bag,a. the bag will remain motionlessb. the bag will begin to slidec. the bag will rise off the cartd. need more information to calculate17. If you lift up on the bag with 275 N of vertical force, the acceleration of the bag will bea. 21 m/s/sb. 11 m/s/sc. 4 m/s/sd. 1 m/s/se. need more information to calculate18. According to Newton's third law, when two bodies collide,a. the forces on each body will be exactly the sameb. the forces on each body will be exactly the same if the mass of each body is approximately the samec. the force applied to each body will be the same sized. the force applied to each body will be the same size if the mass of each body is approximately the samee. none of the above19. An unbalanced horizontal force of 200 N is applied to a wrestler of mass 100 kg. The horizontal acceleration of the wrestler will bea. 200 m/s/sb. 100 m/s/sc. 2 m/s/sd. 1 m/s/se. need more information to calculate20. If an unbalanced horizontal force is applied to a body that is moving horizontally, the body willa. stay moving until the unbalanced force is removedb. start to increase speedc. start to decrease speedd. change direction of movemente. need more information to determine21. The skip of the Canadian curling team exerts a horizontal force of 10 N against the 20 kg rock during his delivery. At this instant, the rock is sliding across the ice, and the skip is not exerting any vertical force on it. The coefficient of static friction between the rock and the ice is 0.08. The coefficient of dynamic friction between the rock and the ice is 0.05. What is the horizontal acceleration of the rock?Correct Answer:22. A 500 N gymnast performs a stationary handstand on the high bar. How much force is exerted by the bar on the gymnast's hands?a. 50 Nb. 100 Nc. 500 Nd. 2500 Ne. need more information to calculate23. A high jumper with a body weight of 820 N exerts an average vertical force of 1640 N down on the floor for 0.75 s.The average vertical force exerted on the jumper by the floor isa. 615 Nb. 820 Nc. 1230 Nd. 1640 Ne. 3280 N24. When a dancer pushes off from the floor, the observed acceleration is less for the floor than for the dancer becausea. the floor has less inertia than the dancerb. the dancer has less inertia than the floorc. the reaction force applied to the dancer is greater than the action force applied to the floord. the action force applied to the dancer is greater than the reaction force applied to the floore. The accelerations are actually the same, but the audience is only interested in the motion of the dancer.25. A 60 kg dancer applies a horizontal force of -800 N on the dance floor. The dancer's acceleration will bea. -7.5 m/s/sb. 7.5 m/s/sc. -13.33 m/s/sd. 13.33 m/s/se. need more information to calculate26. Which of the following is not a force?a. frictionb. massc. weightd. gravity27. Units of momentum could bea. m/sb. Nc. joulesd. N·m/se. kg·m/s28. Which quantity causes a