A ball of mass 0.5 kg flies through the air at low speed, so that air resistance
ID: 1655753 • Letter: A
Question
A ball of mass 0.5 kg flies through the air at low speed, so that air resistance is negligible. What is the net force acting on the ball while it is in motion? F_net = Which components of the ball's momentum will be changed by this force? What happens to the x component of the ball's momentum during its flight? What happens to the y component of the ball's momentum during its flight? What happens to the z component of the ball's momentum during its flight? In this situation, why is it legitimate to use the formula for average y component of velocity, v_avg, y = v_yi + v_yf/2, to update the y component of position? Check all that apply. The ball's velocity changes at a constant rate because the net force on the ball is constant. This formula for average velocity is always valid. The ball's speed is small compared to the speed of light.Explanation / Answer
given mass of ball, m = 0.5 kg, no air resistance
a. Net force acting on the ball, F = mg ( force of gravity)
F = 0.5*9.81 = 4.905 N
b. this force is acting downwards, so, y component of momentum will be changed by this force
c. the x component of the momentum of the ball during its flight remains constant as no force acts in the x direction
d. the y component of the momentum of the ball decreases ( as force is along -ve y axis)
e. the z component of momentum of this ball remains unchanged
f. vavg = (vyi + vyf)/2 because the balls velocity chaqnges at a constant rate as force on the ball is constant
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