How large a force is required to accelerate a body of weight 5 N with 4 ms-2 (g 10 ms-2):
Correct answer: B. 2 N
- A. 10 N
- B. 2 N
- C. 5 N
- D. 1 N
Explanation
To solve this problem, we start by determining the mass of the object using its weight. The weight (W) is given as 5 N, and gravitational acceleration (g) is 10 ms-2. Using the formula W = mg, we find the mass (m) as follows: m = W/g = 5 N / 10 ms-2 = 0.5 kg.Next, apply Newton's second law of motion, F = ma, where F is the force, m is the mass (0.5 kg), and a is the acceleration (4 ms-2). Substituting the values, we get F = (0.5 kg)(4 ms-2) = 2 N.Therefore, the correct answer is 2 N. The other options are incorrect because they do not align with the calculation: 10 N overestimates the required force, while 5 N and 1 N underestimate it.
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