Free fall

Answer Key - Grade 11 Science Worksheet - Building Confidence

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

1. 1.

   A ball is dropped from rest from a hovering drone. With g = 9.8 m/s² and no air, how fast is it falling after 4 s, Ari?

   39.2 m/s
2. 2.

   A ball is dropped from rest from a hovering drone. With g = 9.8 m/s² and no air, how fast is it falling after 0.5 s, Esme?

   4.9 m/s
4. 3.

   In the velocity-time graph, what is the slope, Jun?

   • 29.4 m/s²
   • 9.8 m/s²
   • 4.9 m/s²
5. 4.

   In the velocity-time graph, how far does the ball fall in the first 2 s, Luz?

   Use the picture in question 3.

   • 39.2 m
   • 9.8 m
   • 19.6 m
6. 5.

   About what is g, the free-fall acceleration near Earth's surface, Milo?

   • About 98 m/s²
   • About 9.8 m/s
   • About 9.8 m/s²
7. 6.

   On the Moon, where there is no air, an astronaut dropped a hammer and a feather together. What happened, Noah?

   • The hammer landed first, since it is heavier
   • They landed together
   • The feather landed first
8. 7.

   On Earth, a feather drifts down slowly while a ball drops fast. Why, Pia?

   • Feathers have no mass
   • Air slows the feather much more
   • Lighter things have a smaller g
9. 8.

   A spring toy launches a ball straight up. What is its acceleration at the very top, Ren?

   • 0 m/s², since it has stopped
   • 9.8 m/s² downward
   • 9.8 m/s² upward
10. 9.

    While the launched ball is still rising, what is it doing, Tala?

    • Speeding up
    • Moving at a steady speed
    • Slowing down
11. 10.

    After the top, while the ball falls back down, what is it doing, Zee?

    • Falling at a steady speed
    • Slowing down
    • Speeding up