| A | B |
|---|
| 1. A force of 60 N accelerates an 8-kg wagon at 4.8 m/s^2 along a sidewalk. Determine how large the frictional force is and the coefficient of friction. | 21.6 N; 0.28 |
| 2. A dog weighing 300 N harnessed to a sled can exert a maximum horizontal force of 160 N without slipping. What is the coefficient of static friction between the dog's foot pads and the road? (NOTE: Static Friction means that the dog isn't moving yet because he's not pulling hard enough so a=0.) | 0.53 |
| 3. A force of 40-N accelerates a 5.0-kg block at 6.0 m/s^2 along a horizontal surface. What is the coefficient of friction? | 0.2 |
| 4. A force of 30 N accelerates a 9.0-kg wagon at 3.0 m/s^2 along a sidewalk. How large is the frictional force? What is the coefficient of friction? | 3 N, 0.03 |
| 5. A 2.0-kg brick has a sliding coefficient of friction of 0.38. What force must be applied to the brick for it to move at a constant velocity? | 7.5 N |
| 6. 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 a constant speed, find the coefficient of friction between the table and the lead brick. | 0.47 |
| 7. A horizontal force of 80 N is required to start a 30-kg block sliding along a horizontal surface. What is the coefficient of friction? | 0.27 |
| 8. Two forces, one a frictional force of 10 N and the other an applied force of 30 N, act on a 10-kg box. Find the acceleration of the box. | 2 m/s^2 |
