Question

Three identical blocks each having a mass M are pushed by a force F on a frictionless table. what is the net force on block A? what force does A apply on B​

Answer 1

Explanation:

Acceleration of all blocks=F/3M

Net Force on A=F-(2M*F/3M)

=F/3

Force applied by block A on B =2M*a

=2M*F/3M

=2F/3

Answer 2

Answer:

Supposethecommonacceleration=a

Totalmass=m+m+m=3m

Then,a=

3m

F

NetforceonP=F

1

=ma=m×

3m

F

=

3

F

ForceappliedonQbyp,

F

2

=(m+m)a=2m×

3m

F

=

3

2F

ForceappliedonRbyQ,

F

3

=ma=m×

3m

F =

3

F