AU  - RILEY,PETER
TI  - FORCES & MOTION
T2  - SCIENCE TOPICS
SN  - 0431076685
U1  - 531.113/RIL 
PY  - 1999///
CY  - OXFORD
PB  - HEINEMANN LIBRARY
KW  - SCIENCE
KW  - FORCE
KW  - GRAVITY
KW  - FRICTION
KW  - PRESSURE
ER  -