Projectile Motion Review

The horizontal component of a projectile's velocity is independent of...

• it's range
• time
• the vertical component
• none of these

In the absence of air friction, the vertical component of a projectile's velocity doesn't change as the projectile moves. 

• True
• False
• Sometimes true
• Sometimes false

In the absence of air friction, the horizontal component of a projectile's velocity doesn't change as the projectile moves. 

• True
• False
• Sometimes true
• Sometimes false

In the absence of air resistance, the angle at which a thrown ball will go the farthest is

• 15^o
• 30⁰
• 45^o
• 60⁰

What is the resultant of a 3-unit vector and a 4-unit vector at right angles to each other? 

• 1
• 5
• 7
• 9

At the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height. Which ball hits the ground first? 

• Neither- they hit at the same time
• the horizontally thrown ball
• the dropped ball
• None of these

What is the vertical acceleration of a projectile?

• 0 m/s²
• 9.8 m/s²

Tags

NGSS.HS-PS2-1

Two objects - one with mass m and the other with mass 2m - are released from rest at the same height (neglecting air resistance). Which object hits the ground first?

• mass m
• mass 2m
• both objects hit the ground at the same time
• unable to determine with information given

An object is shot directly upward from the ground. T₁ represents the time it takes to reach the maximum height. T₂ represents the time it takes to travel from the maximum height to the ground.

• T1 = T2
• T1 < T2
• T1 > T2
• unable to determine

Tags

NGSS.HS-PS2-1

An object is shot directly upward from the ground. v₁ represents the initial upward velocity. v₂ represents the velocity right before impact. (only magnitude)

• v1 = v2
• v1 < v2
• v1 > v2
• unable to determine

Tags

NGSS.HS-PS2-1