No unbalanced force acts on a moving trolley. According to Newton's first law, what does the trolley do?
AKeeps its state of motion
BSlows to a stop soon
CSpeeds up on its own
DTurns towards the ground
Answer & Solution
Correct answer: A. Keeps its state of motion
1. Newton's first law deals with what happens when no resultant force acts.
2. An object continues in a state of rest or uniform motion unless acted on by an unbalanced force.
3. The trolley therefore keeps moving with the same speed in the same straight line.
4. In real life friction and air resistance usually supply that unbalanced force, which is why a rolling ball eventually stops.
_Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 2: Newton's laws_
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