Lesson: Resultant Motion and Force Physics • 9th Grade

In this lesson, we will learn how to show that motion in directions that are at right angles to each other can be represented by motion in one direction.

Lesson Plan

Students will be able to

calculate perpendicular components of a vector representing a displacement, velocity, acceleration, or force,
calculate the resultant of multiple vectors representing displacements, velocities, accelerations, or forces.

Lesson Presentation

Lesson Video

Lesson Explainer

Lesson Playlist

08:07
09:36
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13:53

Lesson Worksheet

Q1:

A length of road stretches north for 10 km from the edge of a town to where it intersects an eastward road. A car is broken down on the eastward road, and the displacement of the edge of the town from the car has a magnitude of 24 km. How far east of the intersection is the car, to the nearest kilometer?

Q2:

A surveyor walks through a field, as shown in the diagram. How much further east does the surveyor walk than he walks north? Round your answer to the nearest meter.

Q3:

Two ropes tied around a heavy stone are pulled with the magnitudes and at the angles shown in the diagram. The 90 N force acts at an angle above the horizontal.

What is the magnitude of the net horizontal force acting on the stone due to the pull from the ropes? Answer to the nearest newton.

What is the magnitude of the net vertical force acting on the stone due to the pull from the ropes? Answer to the nearest newton.