Homework 12/1

(1) The acceleration is equal to the net forces over mass. This means that you would put 30 N over 20 kg of the sled. the acceleration would then equal 1.5 m/s.

(2) in 3 seconds the speed is the net force at 3 seconds which is about 1/3 of the 30 which is equal to 10N over the mass which is 20 kg. this would equal .5 m/s.

(3) You need to exert a constant force on the sled to keep it moving at constant speed. This means that you have to keep applying 30 N onto the sleigh in order for it to move at a constant velocity.

Force diagrams:

the sled is the object of interest. The sled is the center dot. There is an arrow drawn in the negative direction (vertically) that is equal to one drawn from the dot in a positive direction (vertically) they are labeled F(Earth on sled) and F(ground on sled) respectively. Then there is an unbalanced force from the right of the object labeled F(pulling on sled) and 30N.