40 0 0.5 20 Time, t, (s) The graph above shows the net horizontal force acting o

Question

40 0 0.5 20 Time, t, (s) The graph above shows the net horizontal force acting on an object car as a function of time. Assume that the object has a mass of 4.0 kg and that it moves horizontally across a level floor against a frictional force of 20.0 N which acts in the direction opposite the motion. Use what you have learned during the last few weeks to answer the questions below. You may work with other students to develop a problem-solving strategy, but describe your reasoning in your own words 1. Sketch free-body diagrams for the following moments: (a) 0.0 s, (b) t= 1.5, and (c)..t= 2.5 s. (3 pts) 2. What is the net impulse applied to the object during the time interval between t 0 and t 2.1 s? Show your work and explain your reasoning. (1 pt 3. What is the net impulse applied to the object during the time interval between t2.1s and t 2.5 s? Show your work and explain your reasoning. (1 pts)

Explanation / Answer

We know that the impulse is change in momentum

Impulse I = F*DT

from the graph the area under the curve gives the impulse because given graph is F vs time

so the area of the triangle is A = 0.5*b*h

I = 0.5*0.4*(20) = 4 kg m/s

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