Gravitation and Satellites

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이 개념을 다룬 실제 CSCA 기출문제입니다. 답을 펼치기 전에 먼저 직접 풀어 보세요.

1. CSCA Physics December 2025 Past Paper
   The gravitational force acting on an object on Mars is $1 / 3$ of the gravitational force acting on it on Earth. Therefore, the gravitational force acting on an object of mass $\mathrm { m } = 4.8 \mathrm {~kg}$ on Mars is ( ), ( $\mathrm { g } = 10 \mathrm { m } / \mathrm { s } ^ { 2 }$ )
   • A．144 N
   • B．24 N
   • C．48 N
   • D．16 N
   정답 및 풀이 보기

   정답: D

   1 Mars weight is one-third of Earth weight: $\mathrm { W } = ( 1 / 3 ) \mathrm { mg }$. 2 Compute: $\mathrm { W } = ( 1 / 3 ) \times 4.8 \mathrm {~kg} \times 10 \mathrm {~m} / \mathrm { s } ^ { 2 } = 16 \mathrm {~N}$.
   CSCA Physics December 2025 Past Paper 전체에서 보기
2. CSCA Physics March 2026 Past Paper
   An object weighs 30 N on the Moon. Given that the Moon's gravitational acceleration is $1 / 6$ that of Earth's, the object's weight on Earth is
   • A．5 N
   • B．30 N
   • C．180 N
   • D．300 N
   정답 및 풀이 보기

   정답: C

   Mass does not change with location. On the Moon: $W_{\mathrm{Moon}} = m g_{\mathrm{Moon}} = 30 \mathrm {~N}$. Since $g_{\mathrm{Moon}} = g_{\mathrm{Earth}}/6$, $W_{\mathrm{Earth}} = 6 \times W_{\mathrm{Moon}} = 6 \times 30 = 180 \mathrm {~N}$. A divides by 6; B fails to convert; D has an extra factor. Answer: C.
   CSCA Physics March 2026 Past Paper 전체 풀기 — 시간 측정 및 채점
3. CSCA Physics April 2026 Past Paper
   An object's weight on the Moon is approximately $\frac { 1 } { 6 }$ of its weight on Earth. If the object's mass is $m = 6 \mathrm {~kg}$ and the gravitational acceleration on Earth is $g = 10 \mathrm {~m} / \mathrm { s } ^ { 2 }$, its weight on the Moon is
   • A．36 N
   • B．10 N
   • C．60 N
   • D．6 N
   정답 및 풀이 보기

   정답: B

   On Earth, weight $G = m g = 6 \times 10 = 60 \mathrm {~N}$. On the Moon, weight $= \frac { 1 } { 6 } \times 60 =$ 10 N .
   CSCA Physics April 2026 Past Paper 전체 풀기 — 시간 측정 및 채점