Lesson: Distinguishing Weight from Other Forces Physics • 9th Grade

In this lesson, we will learn how to distinguish between the effects of the weight of an object and other forces acting on it.

Lesson Video

Lesson Playlist

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05:26
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02:15

Lesson Worksheet

Q1:

A car has a mass of 460 kg. The weight of the car is evenly supported by its four identical wheels. What force does each wheel apply to the ground?

Q2:

An astronaut who has a mass of 80 kg is in a space station that orbits Earth in free fall. The astronaut is floating in a room of the space station, touching a wall that is perpendicular to Earth’s surface with her hand. She pushes against the wall with a force of 20 N. What is her acceleration perpendicular to the wall?

Q3:

A child who has a mass of 30 kg jumps into the air and lands on the ground. The child hits the ground at a speed of 1 m/s and comes to rest 0.1 s after landing.

What is the child’s weight?

What is the average force applied to the ground by the child’s feet during the landing?