Question

1. A 3 kg lunch box is pushed across the lunch table. The acceleration of the lunch box is 2.0 m/s2. What was the net force applied to the lunch box?

2. Find the weight of a 10 kg rock. Remember, acceleration due to gravity is -9.8 m/s2.

Please show your work.

Answer 1

(1) Answer:

6 Newtons

Explanation:

The net force is (mass) x (acceleration) = (3 kg) x (2.0 m/s^2) = 6 N

(2) Answer:

-98 Newtons

Explanation:

Weight (force due to gravity) is (mass) x (gravitational acceleration) = (10 kg) x (- 9.8 m/s^2) = -98 N

The negative sign due to negative acceleration indicates the gravitational force pointing in the negative direction within the defined coordinate system.