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 3 s, Bo?

   29.4 m/s
3. 3.

   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
5. 4.

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

   • 29.4 m/s²
   • 9.8 m/s²
   • 4.9 m/s²
6. 5.

   In the velocity-time graph, how fast is the ball falling at 2 s, Kira?

   Use the picture in question 4.

   • 9.8 m/s
   • 39.2 m/s
   • 19.6 m/s
7. 6.

   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
8. 7.

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

   • They landed together
   • The feather landed first
   • The hammer landed first, since it is heavier
9. 8.

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

   • Air slows the feather much more
   • Feathers have no mass
   • Lighter things have a smaller g
10. 9.

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

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

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

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