Question

Jim Master attempts to lift a 100 kg barbell, but his strength fails. If the net force is 400N, identify the dominant force

the magnitude and direction of the acceleration.

A)Tension, 4 m/s/s upward.
B)Tension, 9.8 m/s/s upward.
C)Gravity, 4 m/s/s/ downward nare.
D)Gravity. 9.8 m/s/s downward.

Answer 1

The dominant force acting on the barbell as it fails to be lifted by Jim is gravity, not tension, resulting in a downward acceleration of 4 m/s² when a net force of 400 N is applied.

Step-by-step explanation:

Jim Master tries to lift a 100 kg barbell but is unable to apply a force greater than the barbell's weight. Assuming the net force is 400 N downwards, this implies that gravity is the dominant force. Since no other forces (like tension) apparently overcome gravity, the magnitude and direction of the acceleration can be found using Newton's Second Law, F = ma, where F is the net force, m is mass, and a is acceleration. The equation can be rearranged to solve for acceleration (a = F/m). In this case, a would equal 400 N divided by 100 kg, which results in an acceleration of 4 m/s2 downward. This means that the correct answer is C) Gravity, 4 m/s/s downward.