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Grade 12 Challenge: Physics in the Real World Worksheet with Answers

Grade 12 (US) · Year 13 (UK) · Class 12 (India) · Science

Unit 5: Going FurtherReal-World ChallengesChallenge

Real physics with real numbers: dropped phones, the ISS's orbit, escape velocity, braking on ice and messages to Mars. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Challenge: Physics in the Real World

Grade 12 · Science

Score___ / 12

Name

Class

Date

Learning goal: Real-World Challenges

Directions: Read each question carefully and write your answer on the line.

Example

A phone slips from a height of 1.5 m. Ignoring air resistance (g = 9.8 m/s²), how long does it take to hit the ground, in seconds to 2 decimal places?

Answer: 0.55

  1. 1

    A satellite orbits 350 km above Earth's surface. Earth's radius is 6371 km and GM = 3.986 × 10^14 m³/s². What is its orbital period, to the nearest minute?

  2. 2

    Mars is 351 million km from Earth today. Radio signals travel at 300 000 km/s. How many minutes does a message take to reach a rover there? Give your answer to 1 decimal place.

  3. 3

    A 63 kg hiker climbs 1500 m up a mountain. Muscles are about 25% efficient and 1 kcal = 4184 J. How many kcal of food energy does the climb use, to the nearest whole number? (g = 9.8 m/s²)

  4. 4

    A 61 kg hiker climbs 500 m up a mountain. Muscles are about 25% efficient and 1 kcal = 4184 J. How many kcal of food energy does the climb use, to the nearest whole number? (g = 9.8 m/s²)

  5. 5

    A car travelling at 70 km/h brakes hard on a dry road (coefficient of friction 0.7, g = 9.8 m/s²). What is its braking distance, to the nearest metre?

  6. 6

    A 69 kg hiker climbs 1000 m up a mountain. Muscles are about 25% efficient and 1 kcal = 4184 J. How many kcal of food energy does the climb use, to the nearest whole number? (g = 9.8 m/s²)

  7. 7

    A 61 kg person stands on bathroom scales in a lift that is speeding up going down at 3 m/s². What force do the scales read, in newtons? (g = 9.8 m/s², nearest whole number)

  8. 8

    A 59 kg person stands on bathroom scales in a lift that is speeding up going down at 3 m/s². What force do the scales read, in newtons? (g = 9.8 m/s², nearest whole number)

  9. 9

    A phone slips from a height of 20 m. Ignoring air resistance (g = 9.8 m/s²), how long does it take to hit the ground, in seconds to 2 decimal places?

  10. 10

    A 88 kg person stands on bathroom scales in a lift that is speeding up going up at 2 m/s². What force do the scales read, in newtons? (g = 9.8 m/s², nearest whole number)

  11. 11

    A car travelling at 110 km/h brakes hard on a dry road (coefficient of friction 0.7, g = 9.8 m/s²). What is its braking distance, to the nearest metre?

  12. 12

    A car travelling at 110 km/h brakes hard on a wet road (coefficient of friction 0.4, g = 9.8 m/s²). What is its braking distance, to the nearest metre?

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Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/science/12/challenge_physics_world

Answer key (click to show)
  1. 1.91
  2. 2.19.5
  3. 3.885
  4. 4.286
  5. 5.28
  6. 6.646
  7. 7.415
  8. 8.401
  9. 9.2.02
  10. 10.1038
  11. 11.68
  12. 12.119

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