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.

   A 10 kg box sits on a scale on an elevator floor. The elevator accelerates at 0.5 m/s² (up positive). With g = 9.8 m/s², what does the scale read, Esme?

   103 N
4. 4.

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

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

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

   • 49 N, the weight
   • 59 N
   • 0 N
   • 39 N
6. 6.

   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
7. 7.

   On Mars, g is about 3.69 m/s² (NASA). About what does a 2 kg box weigh there, Noah?

   • 2 N
   • About 7.4 N
   • About 1.8 N
   • About 19.6 N
8. 8.

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

   • Nothing
   • The scale reading
   • Its mass
   • Its weight
9. 9.

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

   • About 33.9 N
   • 39.2 N, the weight
   • 0 N
   • 19.6 N
10. 10.

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

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