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物理
中学1〜3年
問題プレビュー
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1
Which of Newton's laws states that an object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction, unless acted upon by an unbalanced force?
A
Newton's Second Law
B
Newton's Third Law
C
Newton's Law of Universal Gravitation
D
Newton's First Law
2
According to Newton's Second Law, what happens to the acceleration of an object if the net force acting on it is doubled while its mass remains constant?
A
The acceleration becomes zero.
B
The acceleration is doubled.
C
The acceleration remains the same.
D
The acceleration is halved.
3
A 5 kg box is pushed with a net force of 20 N. What is the acceleration of the box?
A
100 m/s²
B
0.25 m/s²
C
4 m/s²
D
25 m/s²
4
When you jump off a small boat onto a dock, the boat moves backward. Which of Newton's laws best explains this?
A
Newton's Second Law
B
Newton's Law of Universal Gravitation
C
Newton's Third Law
D
Newton's First Law
5
A student claims that if an object is moving, there must be a force acting on it to keep it moving. Which of Newton's laws directly contradicts this claim?
A
Newton's Third Law
B
Newton's Second Law
C
None of Newton's laws
D
Newton's First Law