A block with a mass of 2kg rests on a horizontal table. The force exerted by the table upon the mass is
1) 0N
2) 2N
3) 9.8N
4) 19.6N
explain~
2007-12-23 13:43:27 · 5 answers · asked by Sanny 1 in Science & Mathematics ➔ Physics
The answer is mg = ( 2.0 kg ) ( 9.8 m/s² ) = 19.6 N
2007-12-23 13:48:33 · answer #1 · answered by jgoulden 7 · 0⤊ 1⤋
well, i hope you know that Force = Mass x Acceleration
The force exerted by the table is called the normal force. since the block has mass theres an acceleration due to gravity, which means that a 2kg block on Earth always exerts 19.6 N of force downwards. we also know that if theres any net force acting on an object then the object will accelerate in the direction of the force. so the block would fall down if there wasn't a table in a way, and since the block isn't moving this means the table MUST be exerting a force upwards on the block, called the normal force, which will exactly cancel out the force due to gravity.
2007-12-23 17:04:03 · answer #2 · answered by lalowawrzyniec 1 · 0⤊ 0⤋
For every action, there is always an equal and opposite reaction.
The weight of a 2 kg mass is:
W = mg
W =(2kg)(9.8m/s^2)
W = 19.6N
So, the object exerts a force of 19.6 N. Thus, the reaction force is 19.6 N exerted by the table upon the 2 kg mass.
Good luck and God bless!
2007-12-23 13:52:13 · answer #3 · answered by Anonymous · 2⤊ 0⤋
the answer is no 4...because when an object rests on a table...there is a downward force provided by the mass of the block itself, at the same time..there will be another normal force that act upon the block in opposite direction so that both are balance and the block can rest on the table..
2007-12-23 13:50:00 · answer #4 · answered by Casey.T 2 · 0⤊ 1⤋
I agree with anil bakshi. Newton will be mad at you. This is very basic.
teddy boy
2007-12-23 13:52:28 · answer #5 · answered by teddy boy 6 · 0⤊ 0⤋