MECH 2: DYNAMICS OF RIGID BODIES

If a rigid body is in translation only, the velocity at points A and B on the rigid body 

• are usually different

• are always the same

• depend on their position

• depend on their relative position

IT IS THE SCIENCE WHICH DEALS WITH BODIES IN MOTION OR ATREST WITH SPECIFIC ATTENTION BEING DIRECTED PRIMARILY TOTHE EXTERNAL EFFECTS OF A FORCE OR A SYSTEM

• STATICS

• THERMODYNAMICS

• DYNAMICS

• MECHANICS

DEALS WITH THE GEOMETRY OF MOTION

• STATICS

• KINEMATICS

• DYNAMICS

• KINETICS

DEALS WITH THE GEOMETRY OF MOTION

• STATICS

• KINEMATICS

• DYNAMICS

• KINETICS

DEALS WITH THE FORCES REQUIRED TO PRODUCED MOTION

• STATICS

• KINEMATICS

• DYNAMICS

• KINETICS

If a rigid body is rotating with a constant angular velocity about a fixed axis, the velocity vector at  point P is 

• ω x r_p

• r_p x ω

• dr_p/dt

• All are correct

A disk is rotating at 4 rad/s in clockwise (CW) direction. If  it is subjected to a constant angular acceleration of 2 rad/s², determine the acceleration at B

• (4 i + 32 j) m/s² 

• (4 i - 32 j) m/s²

• (- 4 i + 32 j) m/s²   

• (- 4 i -32 j) m/s²

A Frisbee is thrown and curves to the right.  It is experiencing 

• rectilinear translation

• curvilinear translation

• pure rotation

• general plane motion

A body subjected to general plane motion undergoes a/an

• translation.

• rotation

• simultaneous translation and rotation

• out-of-plane movement

THE ACTION LINES OF ALL THE FORCES OF THE SYSTEM AREPARALLEL AND LIE IN THE SAME PLANE

• CONCURRENT,COPLANAR
  

• COLLINEAR FORCES SYSTEM
  

• PARALLEL,COPLANAR
  

• NON CONCURRENT,COPLANAR