1.For a battle reenactment, Jeremy uses an antique cannon to launch a projectile. What is the reaction that is paired with the action of firing the cannonball? What outcome would you expect to see? 2. Gary is moving the refrigerator to another spot in the kitchen. The refrigerator has a mass of 89kg, and the coefficient of friction between the fridge and the ground is 0.446. When the fridge is sliding, what is the magnitude of the force of friction? 4.4 N 390 N 870 N 89 N 3. Christopher is pulling a box of inventory across the floor of the store he works at. The box has a mass of 35.8 kg. As he pulls, the box accelerates at a rate of 0.219 m/s How much force is Christopher exerting on the box? 7.84 N 13.9 N 163 N 8.95 N 4. Kendra and her brother are pushing a stalled car. At one point, the forces acting on a the car are the following: a gravitational force of 17 , 400 N downward, a normal force of 17 , 400 N upward, Kendra's pushing force of 235 N southward, her brother's pushing force of 223 N southward, and a friction force of 458 N northward. Which of the following statements is accurate? There is no net force acting on the car. There is a net force of 458 N acting on the car. There is a net force of 916 N acting on the car. There is a net force of 35 , 716 N acting on the car. 5. Hannah is pushing her canoe into the water. She pushes with a force of 24.4 N, causing the canoe to accelerate at a rate of 0.72m/s2 . What is the mass of the Hannah's canoe? 33.9 kg 29.9 kg 30.1 kg 27.4 kg 6. A team of three volunteers is cleaning up debris after a severe weather event. They are trying to move a log that has the following forces acting on it: a gravitational force of 11 , 200 N downward; a normal force of 11 , 200 N upward; the volunteers three simultaneous pulling forces of 255 N, 217 N, and 289 N eastward; and a friction force of 467 N westward. What is the net force on the log? 1228 N east 294 N east There is no net force acting on the log. 23 , 628 N west 7. Oscar places a 7.66 kg box on a 33 ramp. The box accelerates at a rate of 0.64 m/s 2 . What is the coefficient of kinetic friction between the box and the ramp? 0.50 0.58 0.70 8. Cara is skiing down a hill. Her total mass (including the skis) is 70.4 kg. When she reaches the bottom of the ski slope, and the ground becomes level, she is moving at 6.22 m/s. The coefficient of friction between her skis and the snow is 0.114 . How fast will Cara be moving 2.95 seconds after reaching the bottom of the slope? 3.30 m/s 2.92 m/s 1.12 m/s 2.16 m/s 9. A delivery driver is driving around town, dropping off packages. As he works, the total mass of the truck decreases. The maximum force that the engine can produce is constant. Using Newton's second law, explain what affect the decreasing mass will have on the acceleration of the the truck. 10. Two friends are driving in a car, going around a turn at a constant speed. Leslie says that a force is required to make the turn, but Caroline says that no force is required, because they are traveling at a constant speed. Which friend is correct, and why? 11. A 64 kg baseball player jumps into the air throws a 151 g baseball directly eastward with a force of 8.4 N. What is the acceleration of the baseball? 56 m/s 2 to the west 56 m/s 2 to the east 41 m/s 2 to the east 41 m/s 2 to the west 12. Imagine that you are in an elevator, and you have a scale and a 10 N weight. Explain how you could use the scale and the weight to determine if you are accelerating upward or downward. 13. Keller is pushing a pallet jack through a warehouse. The pallet jack has a total mass of 107 kg. In order to maintain a constant velocity, Keller must push with a force of 128.1 N. What is the coefficient of kinetic friction between the pallet jack and the ground? k = 0.19 k = 0.84 k = 0.24 14. Lynn is pushing a supply cart down the hallway. The cart has a mass of 39.1 kg. If she pushes the cart with a force of 26.9 N, what will be the cart's rate of acceleration? 2.14 m/s 2 0.515 m/s 2 0.688 m/s 2 1.72 m/s 2 15. Alex slides a 170 g hockey puck across a sheet of ice. The coefficient of kinetic friction between the puck and the ice is 0.09 . What is the puck's rate of acceleration as it slides across the ice? 2.09 m/s 2 0.88 m/s 2 1.16 m/s 2 1.74 m/s 2