A. resilience
B. proof resilience
C. modulus of resilience
D. toughness
E. impact energy
A. bodies having relative motion
B. two dry surfaces
C. two lubricated surfaces
D. solids and liquids
E. electrically charged particles
A. 4 tonnes/cm2
B. 8 tonnes/cm2
C. 16 tonnes/cm2
D. 22 tonnes/cm2
E. none of the above
A. Wtan(a + )
B. Wtan(a-)
C. Wcos(a + )
D. Wsin(a + )
E. W (sin a + cos )
A. these forces are equal
B. the lines of action of these forces meet in a point
C. the lines of action of these forces are parallel
D. B. and C. above
E. none of the above
A. nature of surfaces
B., area of contact
C. shape of the surfaces
D. ail of the above.
E. A. and B. above
A. more than 50%
B. 25—50%
C. 10—25%
D. 5—10%
E. negligible