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Transcript
Name: _______________________________ Date____________ Core: _____ Newton’s Formulas Practice Worksheet Use one of the following formulas to solve. P=mv (momentum= mass times velocity) F=ma (Force= mass times acceleration-Newton’s 2nd Law) A= F net/ m (acceleration= net force divided by mass Newton’s 2nd Law) A= (sf-si)/t (acceleration equals (final speed minus initial speed) divided by time) PLEASE SHOW YOUR WORK 1. A 85 kg mass has an acceleration of 5.5 m/s2. What is the net force applied? a. 15.4 N b. 467.5 N c. 1.54 N d. 0.06 N 2. How fast must a 50 kg mass travel to have a momentum of 1500 kg m/s? a. 330 m/s b. 0.33 m/s c. 30 m/s d. 75,000 m/s 3. How much force is needed to lift a 25 kg mass? (Hint: Remember, the downward force of gravity on Earth has an acceleration of 9.8 m/s² on the mass) a. 0.255 N b. 15.2 N c. 245 N d. 0.392 N 4. The acceleration due to gravity on the moon is about 1.6 m/s 2. If you weigh (mass) 700 N on Earth, how much would you weigh(mass) on the moon? Hint: f=ma. Substitute, then calculate the net force. (Remember, the downward force of gravity on Earth has an acceleration of 9.8 m/s² on the mass) a. 6860 N b. 114 N c. 1120 N d. 428 N 5. A person is on an elevator that moves downward with an acceleration of 1.8 m/s 2. If the person weighs 686 N, what is the net force on the person? Hint: mass=weight/acceleration, then calculate the net force. (Remember, the downward force of gravity on Earth has an acceleration of 9.8 m/s² on the mass) a. 1234.8 N b. 381.1 N c. 126 N d. 686 N 6. A 2 kg object is dropped from a height of 1000 m. What is the force of air resistance on the object when it reaches terminal velocity? (Hint: Remember, the downward force of gravity on Earth has an acceleration of 9.8 m/s² on the mass) a. 2000 N b. 9.8 N c. 19.6 N d. 500 N 7. If you are pushing on a box with a force of 20 N and there is a force of 7 N on the box due to friction, what is the net force on the box? Hint: (The box is NOT moving up or down. the vertical forces are balanced. The net force is difference of the horizontal forces) a. 140 N b. - 7 N c. 27 N d. 13 N 8. If a 5000 kg mass is moving at a speed of 43 m/s, what is its momentum? a. 0.0086 kg m/s b. 215,000 kg m/s c. 116 kg m/s d. 49,000 N 9. What is the net force on a 4000 kg car that doubles its speed from 15 m/s to 30 m/s over 10 seconds? (Hint: First find the acceleration in reference to time, then find the force) a. 6000 N b. 40,000 N c. 400 N d. 60,000 N 10. A 3200 N force is applied to a 160 kg mass. What is the acceleration of the mass? (Hint: acceleration is not in reference to time) a. 0.05 m/s2 b. 50 m/s2 c. 20 m/s2 d. 512 m/s2