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# quiz4_alex - Quiz 4 L EGN 3321 Dynamics Section 4 goi m m k...

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Unformatted text preview: Quiz 4 L EGN 3321, Dynamics Section 4 Feb 13, 2001 goi m) m k \) 1. Which of the following forces are generally not considered impulsive? ‘ a. Weight of a body and reaction forces b. Reaction forces and the force exerted by a spring (9 Weight of a body and the force exerted by a spring \) 2. When does the principle of impulse and momentum simplify to the conservation of momentum? a When no external forces are applied b. When external impulses sum to zero Q?) (a) and (b) <1) 3. What is the line called that is normal to both surfaces in contact during a collision. Refer to ﬁgure- _\\D.0‘_Q§_m1raa_cb a 1’ MW. ‘3 L/ ( Z) 4. It is generally possible to apply the principle of conservation of energy during a. Any collision between two bodies b Never during a collision between two bodies @ During perfectly elastic impact During perfectly plastic impact ( "2) 5. The coefﬁcient of restitution a. Always takes values between —1 and +1 b. Is dependent on the material of the bodies c. Measures the magnitude of the relative separation velocity over the magnitude of the relative approach velocity (1. (a) and (b) a (b) and (c) (a) and (c) (2 > 6. Circle ALL that apply. Refer to diagram for deﬁnitions of “n” and “t”. For oblique central impact the momentum is conserved along the: a. n-direction for each particle individually t-direction for each particle individually n-direction for the system t-direction for the system ...
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