Question

please help with #7 and question 6 (the last question)

3. Rescale the axes if necessary to see all of the graphs. Answer the following questions: a. At the instant the push ends, what does the force equal? F= b. At the instant the push ends, what does the acceleration equal? a= c. At the instant the push ends, what can you say about the speed of the cart? Look carefully at the graphs on the computer monitor. 4. Use your answers in step 4 to sketch the velocity, force, and acceleration graphs on the axes below. Put numbers on the velocity and force axes. Velocity (m/s) + 0 OL Time (s) Force (N) 0 Time 5 (s) 0 Acceleration (m/s) + 0 01 Time 5 (s) 5. Show a vertical line on the 3 graphs above at the end of the push (the instant when the cart was released). Note: this line should cross all 3 graphs at the same time. Write 'End' above the line. It will be much easier to identify the time if you turn on the Analyze function by clicking on Analyze, Examine. This will give you a vertical line at the same time on all graphs. If the Analyze data box is in the way, click on the top bar of the box and drag the box to the right out of the way. A-7

Answer 1

7)When an object is at rest,the support force equals to the weight of the object. When an external acceleration is applied to the cart, it is no longer at rest and starts to move. The force that opposes the change in motion is the frictional force shown in the sketch below.

= Untitled - Paint - File Home View A? JOLA Outline - * Cut Copy A ta Crop Resize Rotate Fill - Paste Select Q Brushes Size Color 1 Color 2 Edit colors Clipboard Image Tools Shapes Colors V Support force LU TO Applied force Frictional force Force due to weight (mg) + 19 501 x 239px 100% + 1 Search the web and Windows © AD ) 2:52 PM 7/1/2020

Question 6.
After the cart is released ideally due to inertial the cart should move with the constant velocity unless obstructed by an external force.From the Graph we see that with time the cart eventually slows down. This is because the presence of frictional force which opposes the motion. If There was no frictional force magnitude of force would ideally remain the same throughout as stated in the Newton's first law of motion according to which an object in motion tends to remain in motion unless stopped by an external force.