Weight, mass and the normal force

Answer Key - Grade 11 Science Worksheet

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

1. 1.

   A 5 kg box sits on a scale on an elevator floor. The elevator accelerates at 2 m/s² (up positive). With g = 9.8 m/s², what does the scale read, Ari?

   59 N
2. 2.

   A 4 kg box sits on a scale on an elevator floor. The elevator accelerates at -1.8 m/s² (up positive). With g = 9.8 m/s², what does the scale read, Bo?

   32 N
3. 3.

   The elevator is accelerating. In the free-body diagram, what does the scale read now, Jun?

   • 10 N
   • 49 N, the weight
   • 59 N
   • 39 N
4. 4.

   The elevator is accelerating. In the free-body diagram, what does the scale read now, Kira?

   • 59 N
   • 49 N, the weight
   • 39 N
   • 0 N
5. 5.

   The elevator is still rising but slowing, accelerating at 1 m/s² downward. The elevator is accelerating. In the free-body diagram, what does the scale read now, Luz?

   • 5 N
   • 54 N, since it is still rising
   • 49 N, the weight
   • 44 N
6. 6.

   On the Moon, g is 1.62 m/s² (NASA). What does a 10 kg box weigh there, Milo?

   • 6.2 N
   • 16.2 N
   • 98 N
   • 10 N
7. 7.

   A box is weighed on Earth, the Moon and Mars. What stays the same in all three places, Pia?

   • Its mass
   • Its weight
   • The scale reading
   • Nothing
8. 8.

   A 4 kg box rests on a ramp tilted 30°. With g = 9.8 m/s², what is the normal force on it, Ren?

   • 19.6 N
   • 39.2 N, the weight
   • About 33.9 N
   • 0 N
9. 9.

   A 2 kg box rests on a ramp tilted 60°. With g = 9.8 m/s², what is the normal force on it, Tala?

   • 2 N
   • 9.8 N
   • 19.6 N, the weight
   • 17 N
10. 10.

    A box rests on a ramp that is tilted more and more steeply. What happens to the normal force, Zee?

    • It gets smaller
    • It stays equal to the weight
    • It gets bigger
    • It drops to zero at once