Practice Questions

1a. The box in the diagram is replaced with a box with a larger mass. State how the force arrows would change. 

All of the force arrows would increase in size. 

Weight increases, due to the increased mass. In turn, the reaction force will also increase. As the box slides down the ramp and has a larger mass, the frictional force will also increase.

1b. Draw a free body diagram to represent a sled going down a slope covered in snow.

This would look similar to the free body diagram above for the box on the ramp. The size  of the force arrows may vary slightly, but essentially the same.

1c. Suggest how the angle of the ramp would affect the normal force, in this case Force 3.

As the angle increases, the normal force will decrease.