A traveller pulls a suitcase along a horizontal floor at a constant velocity.
The traveller pulls the handle with a force of 60 N at an angle of 40∘40^{\circ}40∘ above the horizontal.
The weight of the suitcase is 150 N.
Draw a scale vector diagram to resolve the 60 N force into a horizontal component and a vertical component.
Use your diagram to determine the size of each component.
Determine the normal contact force of the floor on the suitcase.
Give the size of the resistive force on the suitcase.
The traveller lowers the handle so that it makes a smaller angle with the horizontal. The traveller still pulls with a force of 60 N.
Assume that the resistive force does not change.
Explain why the suitcase now accelerates.