Introduction to Force — NEET Physics MCQs with Solutions
Free NEET Physics Introduction to Force MCQs with step-by-step solutions (40 questions). Part of Laws of Motion. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Introduction to Force · medium · numerical
A force acts on a $2$ kg body producing an acceleration of $5$ m/s². The force is
A. $10$ N ✓ Correct
B. $2.5$ N
C. $7$ N
D. $0.4$ N
Solution: $F = ma = 2 \times 5 = 10$ N.
Q2 — Introduction to Force · medium · numerical
A force of $20$ N acts on a $5$ kg mass. The acceleration produced is
A. $0.25$ m/s²
B. $4$ m/s² ✓ Correct
C. $25$ m/s²
D. $100$ m/s²
Solution: $a = F/m = 20/5 = 4$ m/s².
Q3 — Introduction to Force · easy · numerical
A body accelerates at $3$ m/s² under a force of $12$ N. Its mass is
A. $9$ kg
B. $4$ kg ✓ Correct
C. $0.25$ kg
D. $36$ kg
Solution: $m = F/a = 12/3 = 4$ kg.
Q4 — Introduction to Force · easy · numerical
The weight of a body of mass $10$ kg (g = 10 m/s²) is
A. $1$ N
B. $1000$ N
C. $10$ N
D. $100$ N ✓ Correct
Solution: $W = mg = 10 \times 10 = 100$ N.
Q5 — Introduction to Force · easy · numerical
A body has a weight of $50$ N. Its mass (g = 10 m/s²) is
A. $0.5$ kg
B. $50$ kg
C. $5$ kg ✓ Correct
D. $500$ kg
Solution: $m = W/g = 50/10 = 5$ kg.
Q6 — Introduction to Force · medium · numerical
Two forces of $3$ N and $4$ N act at right angles on a body. The magnitude of the resultant force is
A. $1$ N
B. $7$ N
C. $12$ N
D. $5$ N ✓ Correct
Solution: $R = \sqrt{3^2 + 4^2} = 5$ N.
Q7 — Introduction to Force · medium · numerical
Two forces of $6$ N and $8$ N act perpendicular to each other. The resultant force is
A. $2$ N
B. $14$ N
C. $10$ N ✓ Correct
D. $48$ N
Solution: $R = \sqrt{6^2 + 8^2} = 10$ N.
Q8 — Introduction to Force · easy · numerical
Two collinear forces $5$ N and $3$ N act in the SAME direction. The net force is
A. $15$ N
B. $8$ N ✓ Correct
C. $4$ N
D. $2$ N
Solution: Same direction, so they add: $5 + 3 = 8$ N.
Q9 — Introduction to Force · easy · numerical
Two collinear forces $10$ N and $4$ N act in OPPOSITE directions. The net force is
A. $14$ N
B. $40$ N
C. $6$ N ✓ Correct
D. $2.5$ N
Solution: Opposite directions subtract: $10 - 4 = 6$ N.
Q10 — Introduction to Force · medium · numerical
A $4$ kg body experiences a net force of $8$ N. Its acceleration is
A. $4$ m/s²
B. $0.5$ m/s²
C. $32$ m/s²
D. $2$ m/s² ✓ Correct
Solution: $a = 8/4 = 2$ m/s².
Q11 — Introduction to Force · easy · numerical
The force needed to accelerate a $1000$ kg car at $2$ m/s² is
A. $2000$ N ✓ Correct
B. $2$ N
C. $500$ N
D. $1002$ N
Solution: $F = ma = 1000 \times 2 = 2000$ N.
Q12 — Introduction to Force · medium · numerical
A force of $5$ N acts on a body of mass $0.5$ kg. The acceleration is
A. $5.5$ m/s²
B. $2.5$ m/s²
C. $10$ m/s² ✓ Correct
D. $0.1$ m/s²
Solution: $a = 5/0.5 = 10$ m/s².
Q13 — Introduction to Force · medium · numerical
Two forces $5$ N and $12$ N act at right angles. The resultant is
A. $17$ N
B. $7$ N
C. $13$ N ✓ Correct
D. $60$ N
Solution: $R = \sqrt{5^2 + 12^2} = \sqrt{169} = 13$ N.
Q14 — Introduction to Force · medium · numerical
A $10$ kg mass is at rest on a table. The normal reaction from the table (g = 10 m/s²) is
A. $1000$ N
B. $10$ N
C. Zero
D. $100$ N ✓ Correct
Solution: For equilibrium, normal reaction balances weight: $N = mg = 100$ N.
Q15 — Introduction to Force · medium · numerical
A $20$ kg body accelerates under a force of $100$ N. The acceleration is
A. $2000$ m/s²
B. $0.2$ m/s²
C. $120$ m/s²
D. $5$ m/s² ✓ Correct
Solution: $a = 100/20 = 5$ m/s².
Q16 — Introduction to Force · medium · numerical
On a $2$ kg block, a force of $10$ N acts to the right and $4$ N to the left. The acceleration is
A. $5$ m/s²
B. $2$ m/s²
C. $3$ m/s² to the right ✓ Correct
D. $7$ m/s²
Solution: Net force $= 10 - 4 = 6$ N; $a = 6/2 = 3$ m/s² rightward.
Q17 — Introduction to Force · easy · numerical
The weight of a $10$ kg object on the Moon (g = 1.6 m/s²) is
A. $16$ N ✓ Correct
B. $6.25$ N
C. $1.6$ N
D. $100$ N
Solution: $W = mg = 10 \times 1.6 = 16$ N.
Q18 — Introduction to Force · easy · numerical
A spring of stiffness $200$ N/m is stretched by $0.1$ m. The force in the spring is
A. $0.5$ N
B. $20$ N ✓ Correct
C. $200.1$ N
D. $2000$ N
Solution: $F = kx = 200 \times 0.1 = 20$ N.
Q19 — Introduction to Force · medium · theory
Two equal forces of $10$ N each act at $90°$ to each other. The resultant is
A. $10\sqrt{2}$ N ✓ Correct
B. Zero
C. $10$ N
D. $20$ N
Solution: $R = \sqrt{10^2 + 10^2} = 10\sqrt{2} \approx 14.1$ N.
Q20 — Introduction to Force · medium · numerical
A force of $15$ N produces an acceleration in a $3$ kg body of
A. $5$ m/s² ✓ Correct
B. $18$ m/s²
C. $0.2$ m/s²
D. $45$ m/s²
Solution: $a = 15/3 = 5$ m/s².
Q21 — Introduction to Force · easy · numerical
A force of $5$ kgf (g = 10 m/s²) expressed in newtons is
A. $500$ N
B. $0.5$ N
C. $50$ N ✓ Correct
D. $5$ N
Solution: $1$ kgf $= g$ N $= 10$ N, so $5$ kgf $= 50$ N.
Q22 — Introduction to Force · easy · theory
On a body, $10$ N acts right, and $3$ N and $2$ N act left. The net force is
A. $15$ N
B. $5$ N to the left
C. $9$ N
D. $5$ N to the right ✓ Correct
Solution: Net $= 10 - (3 + 2) = 5$ N to the right.
Q23 — Introduction to Force · easy · numerical
An $8$ kg body under a net force of $40$ N accelerates at
A. $0.2$ m/s²
B. $48$ m/s²
C. $320$ m/s²
D. $5$ m/s² ✓ Correct
Solution: $a = 40/8 = 5$ m/s².
Q24 — Introduction to Force · easy · numerical
A vertical string holds a $3$ kg mass in equilibrium. The tension (g = 10 m/s²) is
A. $30$ N ✓ Correct
B. $3$ N
C. Zero
D. $300$ N
Solution: Tension balances weight: $T = mg = 30$ N.
Q25 — Introduction to Force · medium · numerical
Two forces $9$ N and $12$ N act perpendicular to each other. The resultant is
A. $21$ N
B. $3$ N
C. $15$ N ✓ Correct
D. $108$ N
Solution: $R = \sqrt{9^2 + 12^2} = \sqrt{225} = 15$ N.
Q26 — Introduction to Force · medium · numerical
A force of $2$ N acts on a body of mass $100$ g. The acceleration is
A. $2$ m/s²
B. $0.05$ m/s²
C. $20$ m/s² ✓ Correct
D. $200$ m/s²
Solution: $m = 0.1$ kg; $a = 2/0.1 = 20$ m/s².
Q27 — Introduction to Force · medium · numerical
A body of mass $1$ kg is acted on by $4$ N and $3$ N at right angles. Its acceleration is
A. $1$ m/s²
B. $12$ m/s²
C. $5$ m/s² ✓ Correct
D. $7$ m/s²
Solution: Resultant $= \sqrt{16+9} = 5$ N; $a = 5/1 = 5$ m/s².
Q28 — Introduction to Force · medium · numerical
The force required to give a $2000$ kg truck an acceleration of $0.5$ m/s² is
A. $2000.5$ N
B. $1$ N
C. $4000$ N
D. $1000$ N ✓ Correct
Solution: $F = 2000 \times 0.5 = 1000$ N.
Q29 — Introduction to Force · medium · numerical
A body of mass $6$ kg experiences a net force of $18$ N. The acceleration is
A. $3$ m/s² ✓ Correct
B. $24$ m/s²
C. $0.33$ m/s²
D. $108$ m/s²
Solution: $a = 18/6 = 3$ m/s².
Q30 — Introduction to Force · easy · numerical
A body of mass $5$ kg has weight (g = 9.8 m/s²) approximately
A. $14.8$ N
B. $0.5$ N
C. $5$ N
D. $49$ N ✓ Correct
Solution: $W = 5 \times 9.8 = 49$ N.