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Mr. Bosworth General Physics Forces and Acceleration 1. Name_______________________________ Period_____ What force is needed to accelerate an 850. kg car at 5.0 m/s2? Answer_______________________ 2. What acceleration results when a force of 5230. N acts on a 650. kg object? Answer_______________________ 3. A force of 5.0 N is applied to a 355-g hockey puck initially at rest on a frictionless surface. a. What is the acceleration acting on the puck? Answer_______________________ b. How fast is the puck moving after 2.5 s? Answer_______________________ c. How far has the puck moved after 3.2 s? Answer_______________________ 4. A 93.5-kg skydiver is falling and accelerating down at 5.65 m/s2. What is the force due to air resistance acting on the skydiver? Answer_______________________ 5. A 1000 kg car is moving at a constant 20.3 m/s. A 330. N force starts acting on it forward and a 220. N force acts against its motion. If the forces act for 5.00s, how fast is the car now moving? Answer_______________________ 6. A car is moving at a constant 12.8 m/s. A 290. N force acts forward on the car and a 290. N force acts backward on the car. The forces act for 3.25 s. How fast is the car moving after the 3.25 s? Answer_______________________ 7. A 100. kg person is standing on an elevator. a. What does the person weigh on the stationary elevator? Answer_______________________ b. What does the person weigh if the elevator is accelerating up at 2.00 m/s2? Answer_______________________ c. What does the person weigh if the elevator is accelerating down at 4.50 m/s2? Answer_______________________ 8. A 75.3-kg person is riding in a car moving at 24.5 m/s when it hits a car and stops over a distance of 1.20 m. What force acts on the person while stopping? Answer_______________________
