Concept Physics Two Dimensional Motion

As a ball rolls across a table it has a constant horizontal velocity. When the ball rolls off the table the horizontal velocity...

• Stays the same
• Accelerates at -9.8 m/s²
• Accelerates at an unknown value
• Becomes zero

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

In the previous problem a ball rolls off of a horizontal table and falls to the ground. The instant the ball leaves the table its vertical velocity is...

• -9.8m/s
• Unknown
• 0m/s
• 9.8m/s

A ball is rolling across a table with a horizontal velocity of 2m/s. It rolls off a table that's 2m tall. How far does the ball land away from the table (dx)?

• 1.26 m Away
• 4.13 m Away
• 0.98 m Away
• 3.45 m Away

Jimmy and Emily are conducting an experiment where they roll marbles off the edge of a table and predict how far they will go. Jimmy says, "The marbles have a constant horizontal velocity, and the marbles that are going faster when they leave the table will stay in the air longer, so they will go further."

• Jimmy is wrong because the horizontal velocity does not determine how long a horizontal projectile stays in the air. 
• Jimmy is wrong because the horizontal velocity doesn't determine how far the marble will go. 
• Jimmy is right because the greater the horizontal velocity the longer the marble will fly through the air. 
• Jimmy is wrong because the horizontal velocity won't be constant. 

You want to conduct an experiment where you predict the landing spot of a horizontally launched projectile. Your group has already determined the horizontal velocity using a meter stick and a stopwatch. What other information do you need to predict how far the object will go when it launches off of the table. 

• You need the height of the table so you can calculate how long it will take the object to fall. 
• You need the mass of the object to determine how quickly it falls. 
• You need the length of the table to determine how long it travels before launching. 
• You need the angle the object leaves. 

What happens to the vertical velocity of a projectile launched horizontally from a cliff?

• increases

• decreases

• remains the same

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

What happens to the horizontal velocity of a projectile launched horizontally from a cliff?

• increases

• decreases

• remains the same

What is the initial component of the vertical velocity for an object launched horizontally from a cliff?

• 0 m/s

• 9.81 m/s

• not enough information to tell

A red ball is dropped from a height of 50 m and an orange ball is thrown horizontally from a 50 m cliff. Compare their times in the air.

• the red ball will hit the ground first

• the orange ball will hit the ground first

• the red ball and orange ball will hit the ground at the same time

Projectile A is fired with a velocity of 20 m/s while projectile B is fired with a velocity of 40 m/s from the same height.  Which statement best describes the range  of projectile B as compared to projectile A?

• Projectile B goes half as far as projectile A,
• Projectile B goes twice as far as projectile A.
• Projectile B goes the same range as projectile A.
• Can not be compared.