Projectile Motion- an Introduction

Projectile Motion- an Introduction

by SciDept Twenty Twenty-One

​Objectives

1. describe the horizontal and vertical motions of a projectile

​ 2. investigate the relationship between the angle of release and the height and range of the projectile

​

​ 3. to take the mandatory screen breaks

​Hello, students!

​Projectile motion entails knowledge about force, motion, the three laws of motion, free fall, and uniform circular motion. Would you please take the mandatory screen breaks to ensure that you can understand the lessons and stay healthy?

Multiple Choice

What is the acceleration of a ball that is dropped off the side of a cliff after 1,2,3,4,5 seconds? (assume g is rounded to 10 m/s²)

• 5,10,15, 20, 25 m/s²

• 10, 20, 30, 40, 50 m/s²

• 5, 20, 45, 80, 125 m/s²

• 10,10,10,10,10 m/s²

Multiple Choice

When an object falls in physics world, what happens?

• It accelerates at a constant rate until it hits the ground

• It accelerates at a non-constant rate until it hits the ground

• It accelerates at a constant rate until it reaches terminal velocity

• It accelerates at a non-constant rate until it reaches terminal velocity

Multiple Choice

Which would hit the ground first if dropped from the same height in a vacuum—a feather or a metal bolt?

• the feather

• the metal bolt

• They would hit the ground at the same time.

• They would be suspended in a vacuum.

​Please take a mandatory 3-minute screen break.

​

Multiple Choice

What is the direction of the velocity at point B, if the ball is revolving clockwise?

• up

• right

• down

• left

Multiple Choice

What is the direction of the acceleration at point A, if the ball is revolving clockwise?

• up

• right

• down

• left

Multiple Choice

The velocity is always _____ to the line of a circle. 

• outwards

• towards the center

• tangent

• faster

Multiple Choice

Which statement is true about an object that is traveling in uniform circular motion?

• The speed of the object varies.

• The net force on the object is directed toward the center of the circular path.

• The direction of the object's velocity is constant.

• The net force on the object is directed away from the center of the circular path.

Multiple Choice

Centripetal acceleration is ...

• Acceleration toward the center of a curved or circular path

• Acceleration toward the outside of a circle

• Vertical motion instead of horizontal motion

​Please take a mandatory 3-minute screen break.

​

Multiple Choice

The x and y component of a projectile are independent of one another.

• True

• False

Multiple Choice

Without gravity, you can toss anything into the air and it will follow a straight-line path. 

• True

• False

Multiple Choice

If the velocity of a tossed rock (or anything really) is great enough, it can become a satellite. 

• True

• False

Multiple Choice

If you throw a baseball straight up, what is its acceleration at the highest point?

• 9.8 m/s²

• 9.8 m/s

• 0 m/s²

• 0 m/s

Multiple Choice

In a projectile motion we always have...

• 1 component (x)

• 3 components (x,y, and z)

• 2 components (x and y)

• 0 components

Multiple Choice

What is the vertical acceleration of a projectile?(neglect air resistance) 

• 0 m/s²

• 9.8 m/s²

Multiple Choice

What is the direction of the acceleration for any projectile?

• The direction the projectile is traveling.

• Down

• Up

• Sideways

Multiple Choice

If you throw a baseball straight up, what is its acceleration at the highest point?

• 9.8 m/s²

• 9.8 m/s

• 0 m/s²

• 0 m/s

Multiple Choice

What is the horizontal acceleration of a projectile?

• 0 m/s²

• 9.8 m/s²

Multiple Choice

The shape of the path a projectile follows...

• circular

• linear

• wavy

• parabolic

Multiple Choice

What is the vertical acceleration of a projectile?(neglect air resistance) 

• 0 m/s²

• 9.8 m/s²

Multiple Choice

In a projectile motion we always have...

• 1 component (x)

• 3 components (x,y, and z)

• 2 components (x and y)

• 0 components

Multiple Choice

What is the direction of the acceleration for any projectile?

• The direction the projectile is traveling.

• Down

• Up

• Sideways

Multiple Choice

A ball is thrown and follows the parabolic path shown above. Air friction is negligible. Point Q is the highest point on the path. Points P and R are the same height above the ground. Which of the following diagrams best shows the direction of the acceleration of the ball at point P?

Multiple Choice

The more mass an object has, the faster it will fall.

• True

• False

Multiple Choice

As an object travels through the air, its vertical velocity 

• changes continuously

• remains the same

Multiple Choice

What force acts in the y direction that causes an object to travel in a parabolic arc?

• Friction

• Gravity

• Tension

• No force acting.