4c d
Q1-in pure rolling of a sphere of radius r on rough horizontal surface if angular acceleration a2 and linear acceleration a1 are related as a1=r*a2.
then
a-frction force act in direction of rolling
b-friction force act in direction opposite the direction of rolling
c-no friction force act.
d-angular momentum is conserved about centre of mass.
Q2
if it is given that a body is in translation equilibrium and
suppose torque about a an axis comes zero then the torque
about any axis parallel to the plane of forces
(provided body is in translation equilibrium)
is zero or not ?
[source NCERT XI class
Q3-in translation motion the direction of linear momentum and velocity are same in all cases
but in rotational motion about fix axis the direction of angular momentum and angular velocity are same if body is symetric and their direction are diffrent if body is not symetric.
the above statement is true or false.
[source NCERT]
Q4-also give explanation for Q2 and Q3 ?
Q5- Arnie and Wimpy are playing tug-of-war. Arnie wins, pulling Wimpy into the mud puddle. Why did Arnie win?
a) Arnie exerted a greater force on the rope than Wimpy exerted on the rope.
b) The rope exerted a greater force on Wimpy than it exerted on Arnie.
c) Arnie exerted a greater force on the ground than Wimpy exerted on the ground.
d) All of the above.
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9 Answers
11No - its d).
U might go on stretching the ground as hard as u possibly can, and hold the rope very loosely, then u lose.
On the contrary simply picture this out - u r having a tug of war with an infant.
U stand on the ground, without exerting any force, and pull the rope with ur strength - u win.
1(1) a
[angular momentum is conserved abt pt of contact rt ?]
(2) 0
[The parallel forces' torque will pass through the axis ?]
(3) how 3 is true [as said by someone above] ?
(5) d
