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
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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- Fall '02