Question

Wext = FL (20) =0.265N . 0.55m 0.146 Compare the average Wext from Table 3 to the theoretical Wext above using the percent difference test. Is the test successful? If Wext, experimental = Wext, theoretical what does that mean? (See the example in Section 4.2, Notes to Students). |0.146 - 0.1408| / (0.146 + 0.1408)/2 x 100 < 10% Percent difference test: |Wext, experimental - Wext, theoretical| / (Wext, experimental + Wext, theoretical) / 2 x 100 < 10% (21) If Wext, experimental = Wext, theoretical within 10% error, what does that mean? Post-Lab Question: Answer the following questions without help from your demonstrator. You may discuss with your lab partner. 1) Suppose you throw a ball of mass m straight up with an initial vertical velocity v (m/s) and catch it later. Answer the following questions assuming there is no air friction or no non-conservative forces acting on the ball. Define potential energy as zero at the level where the ball leaves your hand. Your answers must contain only m and v and no other variables like height. You can find the answers easily if you think about the conservation of mechanical energy of the system. v m/s (a) What is the kinetic energy of the ball when it was leaving your hand? PE zero level (b) What is the mechanical energy of the ball when it was leaving your hand?

          Wext = FL (20)
=0.265N . 0.55m
0.146
Compare the average Wext from Table 3 to the theoretical Wext above using the percent difference test. Is the test successful? If Wext, experimental = Wext, theoretical what does that mean? (See the example in Section 4.2, Notes to Students).
|0.146 - 0.1408| / (0.146 + 0.1408)/2 x 100 < 10%
Percent difference test:
|Wext, experimental - Wext, theoretical| / (Wext, experimental + Wext, theoretical) / 2 x 100 < 10% (21)
If Wext, experimental = Wext, theoretical within 10% error, what does that mean?
Post-Lab Question: Answer the following questions without help from your demonstrator. You may discuss with your lab partner.
1) Suppose you throw a ball of mass m straight up with an initial vertical velocity v (m/s) and catch it later. Answer the following questions assuming there is no air friction or no non-conservative forces acting on the ball. Define potential energy as zero at the level where the ball leaves your hand.
Your answers must contain only m and v and no other variables like height. You can find the answers easily if you think about the conservation of mechanical energy of the system.
v m/s
(a) What is the kinetic energy of the ball when it was leaving your hand?
PE zero level
(b) What is the mechanical energy of the ball when it was leaving your hand?

Wext = FL (20)
=0.265N . 0.55m
0.146
Compare the average Wext from Table 3 to the theoretical Wext above using the percent difference test. Is the test successful? If Wext, experimental = Wext, theoretical what does that mean? (See the example in Section 4.2, Notes to Students).
|0.146 - 0.1408| / (0.146 + 0.1408)/2 x 100 < 10%
Percent difference test:
|Wext, experimental - Wext, theoretical| / (Wext, experimental + Wext, theoretical) / 2 x 100 < 10% (21)
If Wext, experimental = Wext, theoretical within 10% error, what does that mean?
Post-Lab Question: Answer the following questions without help from your demonstrator. You may discuss with your lab partner.
1) Suppose you throw a ball of mass m straight up with an initial vertical velocity v (m/s) and catch it later. Answer the following questions assuming there is no air friction or no non-conservative forces acting on the ball. Define potential energy as zero at the level where the ball leaves your hand.
Your answers must contain only m and v and no other variables like height. You can find the answers easily if you think about the conservation of mechanical energy of the system.
v m/s
(a) What is the kinetic energy of the ball when it was leaving your hand?
PE zero level
(b) What is the mechanical energy of the ball when it was leaving your hand?

Added by Erin L.

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