Master the Basics of Forces

Why does it feel like the person is floating when they have stopped accelerating?

Because they have reached the maximum height
Because they are no longer being pulled by gravity
Because their velocity is steady and there is no net force on them (correct)
Because their parachutes have increased drag

What happens when the person pulls their cords to open their parachutes?

Velocity levels off
Gravity increases
The net force becomes zero
Drag increases and there is an unbalanced force upward (correct)

What is the relationship between drag and velocity according to the text?

As velocity increases, drag increases (correct)
As velocity decreases, drag increases
As velocity increases, drag decreases
As velocity decreases, drag decreases

What happens when the forces of acceleration and drag fall into balance?

The net force becomes zero and the person stops accelerating (D) Signup and view all the answers

What is the main reason why the person in the text feels like they are floating?

Because their velocity is steady and there is no net force on them (A) Signup and view all the answers

What is a force?

An invisible push or pull on an object (C) Signup and view all the answers

What is the unit used to measure force?

Newtons (C) Signup and view all the answers

What is an unbalanced force?

A push or pull where the net force is not zero (C) Signup and view all the answers

What is the difference between magnitude and direction of a force?

Magnitude is the size of the force, and direction is the way the force is acting (C) Signup and view all the answers

What happens when two forces push in opposite directions with the same magnitude?

They cancel each other out (C) Signup and view all the answers

Which of the following best describes the force of drag?

The force of air molecules resisting motion through the air (D) Signup and view all the answers

What is the net force on the plane while it is flying straight and level?

Zero (D) Signup and view all the answers

What is the difference between acceleration and velocity in physics?

Acceleration refers to any change in velocity, while velocity refers to speed and direction of motion (C) Signup and view all the answers

What is the difference between contact and non-contact forces?

Contact forces are between objects that are touching, while non-contact forces can affect objects that are separated (B) Signup and view all the answers

What is the main force that must be overcome in order for a plane to take off?

Gravity (C) Signup and view all the answers

What is a force?

A vector quantity with magnitude and direction (C) Signup and view all the answers

What is the unit used to measure force?

Newton (C) Signup and view all the answers

What is an unbalanced force?

A force that is not equal in magnitude and direction (C) Signup and view all the answers

What is the difference between speed and velocity?

Speed is a scalar quantity, while velocity is a vector quantity (D) Signup and view all the answers

What is the net force when two forces push in opposite directions with different magnitudes?

The net force is equal to the difference between the magnitudes of the two forces (B) Signup and view all the answers

What happens to drag as velocity increases?

Drag increases (D) Signup and view all the answers

What happens when the forces of drag and gravity are balanced?

The person stops accelerating (C) Signup and view all the answers

What causes a sudden, unbalanced force upward when the person pulls their cords?

Drag (C) Signup and view all the answers

What happens when the person's velocity is steady?

The net force on the person is zero (C) Signup and view all the answers

What is the relationship between drag and acceleration according to the text?

Drag and acceleration are inversely proportional (D) Signup and view all the answers

What are the three main forces accounting for the movement of the plane?

Friction, drag, and gravity (B) Signup and view all the answers

What is the net force on the plane while it is flying straight and level?

Zero (A) Signup and view all the answers

What is the difference between acceleration and velocity in physics?

Velocity is the speed of an object in a straight line, while acceleration is any change in velocity, including speed, ups, slowdowns, and turns (B) Signup and view all the answers

What is the main reason why a plane needs to generate enough upward force to overcome gravity?

To get the plane off the ground (C) Signup and view all the answers

What is the difference between contact and non-contact forces?

Contact forces are between objects that are touching, while non-contact forces are between objects that are not touching (A) Signup and view all the answers