8. Which would take more force to stop in 10 seconds: an 8 kg ball rolling at 0.2

m/s, or a 4 kg ball rolling at 1.0 m/s?

Force = mass • acceleration

1) Find acceleration

-) 8kg ball

a = v/t

a=.2 / 10 =.02 m/s^2

Force = 8kg •.02 =.16N

-) 4kg ball

a = v/t

a = 1.0 / 10 =.1 m/s^2

Force = 4kg •.1 =.4N

Answer: The 8kg ball would need more force because it requires. 16N, while the 4kg only need. 4N.