課程名稱︰普通物理學甲
課程性質︰
課程教師︰黃暉理
開課學院：理
開課系所︰生機
考試日期（年月日）︰98/10/1
考試時限（分鐘）：50
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
1.Three connected blocks are pulled to the right on a horizontal frictionless
table by a force of magnitude T3 = 144.0 N. If m1 = 12.0 kg, m2 = 24.0 kg,
and m3 = 36.0 kg, calculate (a) the magnitude of the system's acceleration,
(b) the tension T1, and (c) the tension T2.
┌────┐
┌────┐ │ │
┌───┐ T1 │ │ T2 │ │ T3
│ m1 │------│ m2 │-----│ m3 │-------
└───┘ └────┘ └────┘
2.The two blocks ( m = 20kg and M = 80kg ) are not attached to each other. The
coefficient of static friction between the blocks is μs=0.4,but the surface
beneath the large block is frictionless. What is the minimun magnitude of
the horizontal force F required to keep the smaller block from slipping down
the large block?
┌──────┐
┌──┤ │
──→ │ m │ │
F │ │ │
└──┤ │
│ M │
│ │
│ │
───┴──────┴──
3.A 500g block is dropped onto a relaxed vertical spring that has a spring
constant of k = 5.0 N/cm. The block becomes attached to the spring and
compresses the spring 20cm before momentarily stopping. While the spring is
being compressed,what work is done on the block by (a) the gravitational
force in it and (b) the spring force? (c) What is the speed of the block
just before it hits the spring? (Assume the friction is negligible)
┌──┐ │
│ │ │
└──┘ ↓
┌┐ ┌┐
││───││
││ ╳ ││
││ ╳ ││
││ ╳ ││
│└───┘│
└─────┘
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