If the net work done by all forces acting on a brick is +80 J during some interv
ID: 1614561 • Letter: I
Question
If the net work done by all forces acting on a brick is +80 J during some interval, which form of energy possessed by the brick must definitely have increased? Choose ONE option. KE ME PE all three none Gravity does -25 J of work on a basketball during some interval of time. (a) Is the basketball moving up or down? Explain in 1-2 sentences without equations or math. (b) If gravity is the only force doing work on the basketball, is its mechanical energy conserved during this interval, or not? Explain in 1-2 sentences without equations or calculations. (c) Now assume that a normal force did +25 J of work on the ball during this interval, and that this normal force and gravity are the only forces acting on it If that's the ease, was its mechanical energy conserved? Explain in 1 -2 sentences without equations or calculations. Power, in physics, is the rate at which ____Explanation / Answer
2.) ME
3.)a.) basketball is moving up
Work done = Force * displacement
workdone is negative means displacement should be in opposite direction of force
b.)Yes Mechanical energy will be conserved because the potential energy is gained by basketball is due to gravity and here no other force is acting on basketball so ME remains conserve
c.)NO mechanical energy will not be conserved in this because there is an external force which is acting on ball
d)Power = Rate of doing work
In physics, power is the rate of doing work. It is the amount of energy consumed per unit time.