Questions
1
The relative velocity of B with respect to A in a rigid link AB is
Answer: perpendicular to AB
2
The magnitude of linear velocity of a point B on a link AB relative to point A is
Answer: ω x AB
3
The direction of linear velocity of any point on a link with respect to another point on the same link is
Answer: perpendicular to the link joining the points
4
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω1 rad/s in the clockwise direction and the link OB turns with angular velocity ω2 rad/s in the anti-clockwise direction, then the rubbing velocity at the pin joint O is
Answer: (ω1+ω2)r
5
In the above question, if both the links OA and OB turns in clockwise direction, then the rubbing velocity at the pin joint O is
Answer: (ω1-ω2)r
6
ABCD is a four bar mechanism in which AB = 310mm and CD = 450mm. AB and CD are both perpendicular to the fixed link AD. If the velocity of B at this condition is v. Then the velocity of C is
Answer: 3/2 v
7
A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?
Answer: The centre of the disc has zero acceleration.
8
The component of the accelertion, parallel to the velocity of the particle, at the given instant is called
Answer: tangential component
9
The component of the accelertion, perpendicular to the velocity of the particle, at the given instant is called
Answer: radial component
10
A point B on a rigid link AB moves with respect to A with angular velocity ωrad/s. The total acceleration of B with respect to A will be equal to
Answer: vector sum of radial component and tangential component
