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Class Notes 11-30 ps

Step-by-step guide for solving physics problems through calculations. Identify givens and wanted, visualize with drawings, convert units, solve equations, and check answers with units. Detailed example questions provided.

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Class Notes 11-30 ps

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  1. Class Notes 11-30 ps Hand back Papers Grades Solving Problems through calculations

  2. Steps to solve problems • Identify GIVENS, and what is WANTED • DRAW pictures and LABEL values • IDENTIFY the EQUATION that connects givens and what is wanted • CONVERT units, if needed • PLUG in values, including constants • Solve, DO the MATH • CHECK answer, units

  3. Watch out for the hidden values!

  4. Goal of session • Answer the questions placed around the room • Students may precede in any order • SHOW WORK!! For each problem state: • Givens • What is wanted • Equation • Conversions done • Values plugged into equation • Answer with units F = ma GPE = mgh P=mv P= W/t W = Fd a = (vf -vi)/t KE = ½mv2 MA = Fo / fi

  5. Question #1 • A force of 6.2 x 105 N is needed to blast off a 5.0 x 103 kg rocket from rest. What is the rocket’s average acceleration/

  6. Question #2 • How much does a 59.0 kg woman weigh on Earth?

  7. Question #3 • A coin falls from rest from the balcony of a building. If it takes 2.7 s for it to hit the ground, what is the final velocity of the coin?

  8. Question #4 • An object has a kinetic energy of 810 J after falling a certain distance. If the mass of the object is 20 kg, what is the speed of the object at this time?

  9. Question #5 • The brakes on a car exert a frictional force of 6000N in getting the car to stop. If the work done by the brakes is 120,000 J in coming to a stop, how many meters did the car travel after the driver applied the brakes?

  10. Question #6 • An object weighing 75 N is dropped from the top of a building and falls a distance of 28 m to the ground. How much work does gravity do on the object from the time it is dropped to the time it hits the ground?

  11. Question #7 • A weightlifter presses a 400 N weight 0.5 m over his head in 2 seconds. What is the power of the weightlifter?

  12. Question #8 • Calculate the gravitational potential energy relative to the ground when an 82 kg person climbs to the top of a 2.0 m stepladder.

  13. Question #9 • A crane has a mechanical advantage of 27. An input force of 8650 N is used by the crane to lift a pile of steel girders. What is the weight of the girders?

  14. Question #11 • A commercial plane travels at a velocity of 234 m/s. The plane has 253 people seated onboard. If the average person on the plane has a mass of 68,000 g, what is the momentum of the passengers on the plane?

  15. Question #12 • A school bus can accelerate from a complete stop at 1.3 m/s2. How long will it take the bus to reach a velocity of 12.1 m/s?

  16. Question #13 • A cat sits on top of a fence that is 2.0 m high. The cat has a GPE of 88.9 kJ . What is the mass of the cat?

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