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Transcript
Intro to Physics Starter 6—Problem Set for Newton’s Laws Name __________ Convert by Factor-Label Method 1. 55 g into mg. 2. 66 km/hr into m/s Calculate using weight equation w = mg g = 9.8 m/s2 1. gmoon = 1.6 m/s2 A rock weighs 88 N on Earth. How much mass does it have? 2. What is the weight of a 449 kg cart on Earth? What is the difference in weight if it was on the Moon? Calculate using 2nd Law of Motion F = ma a = Vf – Vi t 1. What is the net force that causes a 2.4 kg wheelbarrow to accelerate at a rate of 2.4 m/s2? 2. What is the rate of acceleration of a 4560 kg dump truck that uses 1299 N of braking force to slow down? 3. What is the mass of a cart that accelerates at a rate of 5.6 m/s2 when it receives an accelerating force of 301 N? 4. A 45 kg scooter speeds up from 4.0 m/s to 12 m/s in 6.7 seconds. What is the force causing the acceleration of the scooter? (hint: you must first solve for the missing variable) 5. A bicyclist/bicycle has a combined mass of 75 kg and is accelerating at a rate of 3.1 m/s2. If the force of friction and air resistance acting on the bicyclist equals 21 N, what is the applied force acting on the bicyclist? 4400 N Starter 7 Using Factor-label method, convert: 812 m/s into km/hr 812 m x 1 km x 60 s x 60 min = 2923.2 km/hr s 1000 m 1 min 1 hr 0.31 km into cm 0.31 km x 1000 m x 100 cm = 31,000 cm 1 km 1m Starter 8 Using Factor-Label Method, convert 24,009 cm into km. 1 km = 1000 m 1 m = 100 cm 24,009 cm x 1 m x 1 km 100 cm 1000 m = 0.24009 km Starter 9 Write each of Newton's Three laws of motion in your spiral notebook. Leave space beneath each for your explanation. Explain how each law applies to the crash test video 1st Law: law of inertia – The barrier applied an unbalanced force to the car, which quickly changed the velocity of the car. – Crash Test Dummies continued to move forward after the collision due to inertia until receiving an unbalanced force. – The seat belts (and steering wheel) provided the unbalanced force for the Crash Test Dummies 2nd Law Fnet = ma or accel of object depends on Fnet/mass • A large net force produces a large acceleration • You can calculate the force of the crash if you know mass and acceleration of the car. 3rd Law For every action force there is an equal and opposite action force • The action force is the car hitting the wall, reaction force is the wall hitting the car (Action and reaction forces are equal and opposite) the car hit the wall with the same force that the wall hit the car, which was enough to crush the front end of the car.