Springs and pendulums

Answer Key - Grade 11 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   A 0.5 kg mass bounces on a spring with a spring constant of 20 N/m. What is its period, to the nearest hundredth, Ari?

   0.99 s
2. 2.

   A 0.2 kg mass bounces on a spring with a spring constant of 80 N/m. What is its period, to the nearest hundredth, Esme?

   0.31 s
3. 3.

   A pendulum timer must have a period of 1 s. With g = 9.8 m/s², about how long must its string be, Jun?

   • About 1.56 m
   • About 1 m
   • About 0.25 m
4. 4.

   A pendulum with a 0.25 m string has a 1 s period. What length gives a 2 s period, Kira?

   • 0.5 m
   • 1 m
   • 2 m
5. 5.

   A mass bounces on a spring with a 1 s period. What spring keeps the mass but halves the period, Luz?

   • One with 4 times the spring constant
   • One with half the spring constant
   • One with twice the spring constant
6. 6.

   Milo says a heavier bob makes a pendulum clock run slower. Agree or disagree?

   • Agree: more mass needs more time
   • Disagree: the period depends on length, not mass
   • Agree: heavier bobs swing more slowly than light ones
7. 7.

   Noah says a heavier mass on the same spring bounces more slowly. Agree or disagree?

   • Disagree: mass can't change a period
   • Agree: T = 2π√(m ÷ k)
   • Disagree: heavier masses bounce faster
8. 8.

   Pia says pulling a pendulum bob back a little farther (still a small swing) changes its period a lot. Agree or disagree?

   • Disagree: small swings keep the same period
   • Agree: a bigger swing is much quicker
   • Agree: a bigger swing takes much longer to complete
9. 9.

   A mass on a spring is taken from Earth to the Moon. What happens to its bounce period, Tala?

   • It gets longer, like a pendulum's
   • It stays the same
   • It gets shorter
10. 10.

    Which timer would keep the same time on Earth and on the Moon, Zee?

    • A bob on a string
    • A mass bouncing on a spring
    • Neither of them