Work-Energy Theorem NEET Questions

Physics - Work, Energy, and Power
Work-Energy Theorem

Work-Energy Theorem MCQ Questions


13.
A cyclist stops in 10 m. Friction on cycle = 200 N, opposing motion. Work done by road on cycle is: [NCERT Ex 5.3]
A.
+2000 J
B.
0 J
C.
โˆ’2000 J
D.
+1000 J
๐Ÿ˜‘ View Answer Error
ANSWER :
C. โˆ’2000 J
14.
The work-energy theorem for a variable force F(x) is:
A.
Only valid for constant forces
B.
Kf โˆ’ Ki = โˆซF(x)dx from xแตข to xf (integral form)
C.
Kf โˆ’ Ki = F_avg ร— d
D.
Valid only in one dimension
๐Ÿ˜‘ View Answer Error
ANSWER :
B. Kf โˆ’ Ki = โˆซF(x)dx from xแตข to xf (integral form)
15.
A block (m = 1 kg) enters rough patch where F_r = โˆ’k/x (k = 0.5 J), initial speed = 2 m/s. Final KE after crossing patch is: [NCERT Ex 5.6]
A.
0.5 J
B.
1.0 J
C.
1.5 J
D.
2.0 J
๐Ÿ˜‘ View Answer Error
ANSWER :
A. 0.5 J
16.
A car (1000 kg) at 5 m/s compresses a spring (k = 5250 N/m) to maximum xm. By WE theorem, xm is: [NCERT Ex 5.8]
A.
1.35 m
B.
2.00 m
C.
2.50 m
D.
1.00 m
๐Ÿ˜‘ View Answer Error
ANSWER :
B. 2.00 m
17.
Same car + spring + friction (ยต = 0.5, g = 10 m/sยฒ). Maximum compression using WE theorem is: [NCERT Ex 5.9]
A.
2.00 m
B.
1.35 m
C.
1.00 m
D.
1.50 m
๐Ÿ˜‘ View Answer Error
ANSWER :
B. 1.35 m
18.
A woman applies variable force (100 N over 10 m, then linearly decreasing to 50 N over next 10 m). Friction = 50 N. Net work done on trunk over 20 m is: [NCERT Ex 5.5]
A.
1750 J
B.
โˆ’1000 J
C.
750 J
D.
1000 J
๐Ÿ˜‘ View Answer Error
ANSWER :
C. 750 J
Prev Next page