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question 20
problem reference 6.3
a 16.0 kg sled is being pulled along the horizontal snow - covered ground by a horizontal, constant force of 24.0 n. starting from rest, the sled attains a speed of 2.00 m/s in 8.00 m.
what is the normal force acting on the sled?
9.80 n
157 n
192 n
16.0 n

Explanation:

Step1: Analyze vertical forces

In the vertical direction, for an object on a horizontal surface, the normal force \(N\) balances the weight \(mg\) (since there is no vertical acceleration). The formula is \(N = mg\).

Step2: Calculate the normal force

Given \(m = 16.0\space kg\) and \(g= 9.8\space m/s^{2}\). Substitute into the formula: \(N=(16.0\space kg)\times(9.8\space m/s^{2})\).

$$N = 156.8\space N\approx157\space N$$

Answer:

157 N