Lesson: Newton’s First Law of Motion

In the given figure, the body is at rest under the action of a system of forces. Given that the forces are measured in newtons, find the magnitudes of and .

A car of mass 1.8 metric tons is moving at a constant speed on a horizontal road. If the resistance to the motion is 57.6 kg-wt per tonne of the car’s mass, find the force of its motor.

A body was moving uniformly under the effect of three forces , , and . Given that and , where and are orthogonal unit vectors, determine which ensures that it will move at a constant velocity.