Why is the net force vector non zero when the thrust is 0 N? Please fill in the

Question

Why is the net force vector non zero when the thrust is 0 N? Please fill in the table 9.3 DAILY SIMULATION. Go to http://phet.colorado.edu/en/simulation/lu and click . Check the Vectors box to see the NET FORCE VECT (yellow) and the VELOCITY VECTO it, and to see how the vectors changedo for better thrust control. For simplicity, try just moving up and down vertically (do the lunar lander). Try to touch down successfully! (Land with as low a speed possible). R (green). Play with the controls to get the hang of n't use the spacebar, use the up/down arrows not tilt as a) Why is the NET FORCE VECTOR non-zero when the thrust is ON ? (hint: how many forces are acting on the lander?) b) Fill in column three in the following table based on your observations. direction of VELOCITY direction of NET FORCE change in speed: increasing or decreasing? up up down down up down up down

Explanation / Answer

a. as we can see from the simulation

there is a net force of gravity on the planet

so total forces acting on the spacecraft = force of gravity + force of thrust

hence, when thrust = 0

net force on the spacecraft = force of gravity on spacecraft = not zero

b. direction of velocity direction of net force Change in speed

up up increasing

up down decreasing

down up decreasing

down down increasing

hence when the net force is in the direciton of the speed, the speed is increasing otherwise the speed decreases

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