Question

The weight of 10kg block is?

Answer 1

Answer:

W =98N

Explanation:

As W=mg where m=10,g=9.8

So W=9.8×10 =98N

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Answer 2

Answer:

Two blocks of mass 5 kg and 10 kg are kept on a rough horizontal surface as shown in figure A force F is applied on upper block of mass 10 kg Now choose the correct statement(s) regarding the system

Explanation:

For 10kg block, f is frictional force

f1max=μ1μ2=μ1(10g)=0.1(10×10)=10N

 

i) if F=2N then acting friction 

f1=F=2N

(A) is correct.

for 5 kg block;

f2max=μ(10+5)g=0.3×15×10=45N

ii) if F=30N then; 

F−F1max=10a

10a=30−10=20

a=2m/s2

(B) is correct.

iii) if μ1 changed to 0.5;

then f1max=μ1(10g)=0.5×10×10=50N

In the case acting friction will be F2max

Since,

F1max=F2max

Block 10kg and 5kg both move together then Fmin to begin.