Question

connecting mass and applied force
use what you know about mass and how you use it to calculate force in the following situation.
if each washer has a mass of 4.9 g, then the mass of two washers in kilograms would be 0.0098 kg. given that f = ma, and if 4 washers are attached to the string and car instead of 2, then the applied force on the car will be
98 n
0.196 n
0.0049 n

Explanation:

Step1: Convert mass to kg

Mass of 1 washer: $4.9\ \text{g} = \frac{4.9}{1000} = 0.0049\ \text{kg}$
Total mass of 4 washers: $4 \times 0.0049 = 0.0196\ \text{kg}$

Step2: Calculate force via $F=ma$

$F = m \times a = 0.0196\ \text{kg} \times 10\ \text{m/s}^2$

Answer:

0.196 N