| A | B |
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| 1. What net force is necessary to give a 0.80-kg air track glider a horizontal acceleration of 1.5 m/s^2? | 1.20 N |
| 2. A prospector pushes a 2030-kg cart on a frictionless surgace with a constant horizontal force of 700 N for 5 s. If the cart starts from rest, how far will it go during the 5 s that the force is applied? | 4.25 m |
| 3. A body of mass m resting on a frictionless surface is given a horizontal acceleration of 4.5 m/s^2 by a force of 8.7 N. What is the mass of the body? What is the weight of the body? | 1.93 kg; 18.9 N |
| 4. A 4.0-kg object is moving across a frictionless surface with a constant velocity of 2 m/s. What horizontal force is necessary to maintain this state of motion? | 0 N |
| 5. A 10-kg lead brick rests on a wooden table. If a force of 46 N is required to slide the brick across the table at constant speed, find the coefficient of friction between the table and the lead brick. | 0.47 |
| 6. A force of 40 N accelerates a 5-kg block at 6 m/s^2 along a horizontal surface. Find the frictional force and coefficient of friction. | 10 N; 0.2 |
| 7. A baseball is accelerated upward at a rate of 2.8 m/s^2. Find the upward force acting on the ball if the weight of the ball is 34.3 N. | 44.1 N |
| 8. A car, mass 1225 kg, traveling at 105 km/h, slows to a stop in 53 m. What is the size of the net force that acted on the car? | -9849 N |
| 9. A bullet of mass 20 g strikes a fixed block of wood at a speed of 320 m/s. The bullet embeds itself in the block of wood, penetrating to a depth of 6.0 cm. Calculate the average net force acting on the bullet while it is being brought to rest. | -17,066 N |
| 10. According a simplified model of a mammalian heart, at each pulse, approximately 20 g of blood is accelerated from 0.25 m/s to 0.35 m/s during a period of 0.10 s. What is the magnitude of the net force exerted by the heart muscle? | 0.02 N |
| 11. An elevator (mass 4850 kg) is to be designed so that the maximum acceleration is 0.0600 g's. What is the maximum force the motor should exert on the supporting cable? | 2,851.8 N |
| 12. A high jumper, falling at 4.0 m/s, lands on a foam pit and comes to rest, compressing the pit 0.4 m. If the pit is able to exert a net force of 1200 N on the high jumper in breaking the fall, what is the jumper's mass? | 60 kg |
| 13. What type of relationship exists between the force of gravity on an object and its mass? | ??? |
| 14. On planet Gamma, a 4-kg mass experiences a gravitational force of 24 N. What is the acceleration due to gravity on planet Gamma? | 6 m/s^2 |
| 15. Two forces, one a frictional force of 5 N and the other an applied force of 10 N, act on a 2-kg object. What is the acceleration of the object? | 2.5 m/s^2 |
| 16. What type of relationship exists between the acceleration of an object and its mass if the force is held constant? | ??? |
