1. Which one is NOT TRUE about a planar motion of a rigid body? All the particle
ID: 1416355 • Letter: 1
Question
1. Which one is NOT TRUE about a planar motion of a rigid body?
All the particles of a rigid body in planar motion moves along paths which are equidistant from a fixed plane.
The spinning motion of a wheel of a moving truck is a planar motion.
The translation and rotation about a fixed axis are two special cases of planar motion.
If a rigid body moves around a circular path, it cannot be in translational motion.
2. What statement is NOT TRUE about a body in planar translation?
Every point on the body has the same position.
Every point on the body has the same velocity.
Every point on the body has the same acceleration.
Its angular velocity is zero.
3 Which statement is NOT TRUE regarding the rotation about a fixed axis of a rigid body?
The rigid body only has one angular velocity.
The fixed axis has to be on the rigid body.
The velocity of a point on the fixed axis is zero.
The velocity magnitude of a point on the rigid body is proportional to the distance from this point to the fixed axis.
a.All the particles of a rigid body in planar motion moves along paths which are equidistant from a fixed plane.
b.The spinning motion of a wheel of a moving truck is a planar motion.
c.The translation and rotation about a fixed axis are two special cases of planar motion.
d.If a rigid body moves around a circular path, it cannot be in translational motion.
Explanation / Answer
Question no.1
answer is d.
If a rigid body moves in circular path it cannot have translatory motion.
Question no.2
answer is a.
Every point on the body has same postion.
Question no.3
answer is c.
The velocity of a point on the fixed axis is zero.(because we know that v=r w)
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