Practice question · Select all that apply
Select every statement that is consistent with Newton's laws.
Hints
- Two of these are the exact misconceptions the lesson warns against.
- In F = ma, acceleration is proportional to force and inversely proportional to mass.
Show the answer
- B. Doubling the net force on a fixed mass doubles its acceleration
- C. For a fixed net force, doubling the mass halves the acceleration
- D. Steady motion in a straight line means the forces on the object balance
Why
Options 1, 4 and 5 restate the first and second laws. Option 2 is the pre-Newtonian error, force changes motion, it does not sustain it. Option 3 misreads the third law: its two forces act on different bodies, so they can never cancel each other.
Practise Newton's Laws and Dynamics
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