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Transcript
Practice with Newton’s First and Second Laws
Name:
1. Which of the following objects has the greatest inertia?
o
o
o
o
𝐹𝑔 = 𝑚𝑔
𝑎=
𝐹𝑛𝑒𝑡
𝑚
𝐹𝑛𝑒𝑡 = 𝑚𝑎
2-kg mass moving at a constant velocity of 100 m/s, E
4-kg mass moving at a constant velocity of 2 m/s, E
2-kg mass moving at a constant velocity of 20 m/s, E
6-kg mass at rest
2. Explain why you made your choice.
3. Which object(s) could be moving with constant velocity along a straight line path if the only forces acting on it are
those shown in each diagram?
4. Explain why you made your choice(s).
5. A certain force F gives a mass m an acceleration of a. The same force F would therefore give a mass of 2m an
acceleration of ____.
 2a
 a
 a/2
 a/4
6. Explain why you made your choice.
7. A certain force F gives a mass m an acceleration of a. A force of 6F would therefore give a mass of 2m an acceleration
of ____ .
 12a
 3a
a
8. Explain why you made your choice.
 a/3
9. Which of the following objects is more massive?
 A force F of 100 N pulls to the right causing this mass to accelerate at 25 m/sec2 to the right
 A force F of 50 N pulling to the right causes this object to accelerate to the right at 10 m/sec2
10. Explain why you made your choice.
11. What is the magnitude (size) of the missing force in the figure diagrammed below? F?= _________
12. Explain why you made your choice.
13. What is the magnitude (size) of the missing force in the figure diagrammed below? F?= _________
14. Explain why you made your choice.
Recall that “normal” force is a mathematics term that means PERPENDICULAR to a supporting surface. This can result in
some interesting diagrams!
15. Label the forces on the box to the right with these labels: weight (Fw), normal
force (Fn), friction (Ff).
16. A 5-kg box sits on a horizontal floor. The box is pushed with a force of 20 N to
the right, and there is an opposing friction force of 7 N. Draw a diagram of the
box and the floor, and label ALL forces acting on the box with names AND
magnitudes (numbers).
17. A box sits on an inclined plane as in #15. The box is pulled down the incline
with a pulling force, and a friction force opposes the pull. Draw a diagram of the
box and the inclined plane, and label ALL forces acting on the box. Labels only,
similar to item 15, are all that is necessary (no numbers required).
15
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