Traditional Culture Encyclopedia - Hotel accommodation - (20 1 1? As shown in the figure, put the car with mass M=8kg on a level and smooth plane, and add a horizontal thrust F=8N at the left end of the car.
(20 1 1? As shown in the figure, put the car with mass M=8kg on a level and smooth plane, and add a horizontal thrust F=8N at the left end of the car.
(1) Taking small objects as the research object, it is obtained by Newton's second law:
μmg=ma 1
Solution: a 1=μg=2m/s2.
Taking the automobile as the research object, from Newton's second law:
F-μmg=Ma2
Solution: A2 = f? μmgM=0.5m/s2
Therefore, the acceleration of a small object is a 1=2m/s2, and that of a car is A2 = 0.5m/S2.
(2) The kinematic formula is a 1t=v0+a2t.
Solution: t = v0a 1? a2= 1s
Then: x1=12a1T2 =1m.
x2 = v0t+ 12a2t 2 = 1.75m
L = x2-x1= 0.75m.
Therefore, the length of the car is 0.75 m.
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