Question

1. A disc rolls on ground without slipping. Velocity of centre of mass is v. If the point P lies ont
circumference of disc at angle as shown in the figure then the speed vp at the point P, w
8 = 90°, 120°. 180°
1 2v. √3v. 2v
2) v. 2v. √3v
3) 2v. √3v. V2v
4) √3v. v. √5v
​

Answer 1

Answer:

Disc is rolling without slipping so ωr=u

Velocity diagram is shown in figure , angle made by speed is 120 because θ=60

o

is given,

Resultant speed u

R

=

u

2

+(ωr)

2

+2×u×ωrcos(120

0

)

,

⇒u

R

=

u

2

+u

2

−u

2

, ( ∵ωr=u )

⇒u

R

=u

solution