1. An object of mass 2 kg moves with a constant acceleration. Its velocity at tw

Question

1. An object of mass 2 kg moves with a constant acceleration. Its velocity at two different times is recorded in the following table. t(s) v(m/s) 1.1 2.3 1.6 7.3 a. Calculate the acceleration. b. How large is the total force acting on the object? 2. A cart of mass mc Is being pulled by an object of mass mw, as shown the diagram. Assume friction is negligible. a. How many forces are acting on the cart? What are these forces? b. Two of the forces above cancel each other. Which are these forces? How do you know that these two forces will add to zero? c. What arc the forces acting on the mass mw?

Explanation / Answer

1)a)a=(vf-vi)/(t2-t1)=(7.3-2.3)/(1.6-1.1)=10m/s^2

b)F=ma=2*10=20N

2)a) 3. Gravity. Normal reaction due to surface. Tension in string.

b)Gravity and normal reaction due to surface cancel each other out. They cancel each other since the cart can only move horizontally and both these forces are vertical.

c)Forces on mw are tension due to string and gravity.

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