weight is the upward reaction force of the base we stand on=R
gravitational force is acts downward on the body=mg
an upward acceleration exists=ma
now how to form the equation of motion, 1st forget the acceleration. without it R and mg balance each other out. net force is zero
R=mg ;
mg -R=0
now there is a force present ma, so the equation becomes
mg-R=ma
the force ma is upward, so correct the direction
R-mg=ma
ma=R-mg=800–400=400 N
then a=10 m/s2.
Three identical balls are placed on a frictionless
horizontal surface touching each other. They stick to
each other because of adhesive. Another ball of same
radius and mass m is placed over the void created by
the three balls. Find the forces applied by the balls
kept on the floor to each other if the system remains
in equilibrium.
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A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.
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Last Activity: 10 Months ago
Last Activity: 3 Years ago
Last Activity: 3 Years ago
