Honors Physics Quiz 1: Modeling Motion

Which of the following best describes what happens to the velocity vector of an object moving along a curved path?

• The magnitude of the velocity vector always increases.

• The direction of the velocity vector is constantly changing.

• The velocity vector remains constant in both magnitude and direction.

• The velocity vector only changes if the speed changes.

Which of the following equations represents the horizontal displacement in projectile motion?

• Δx = vₓt

• vᵧ = vᵧᵢ + gt

• Δy = vᵧᵢt + ½gt²

• F = ma

What is the value of the initial vertical velocity component (vᵧᵢ) when a marble rolls off a horizontal table?

• 9.8 m/s

• 0 m/s

• 1.6 m/s

• 0.42 m/s

If a marble falls from a table 0.85 m tall, what is the time it takes to reach the floor? (Use g = 9.8 m/s²)

• 1.6 s

• 0.66 s

• 0.42 s

• 0.85 s

Tags

NGSS.MS-PS2-4

Which of the following best explains why the horizontal velocity component (vₓ) remains constant during projectile motion?

• Gravity only affects the vertical component.

• Air resistance increases the horizontal velocity.

• The object accelerates horizontally.

• The horizontal velocity is always zero.

Why is it necessary to solve for time using the vertical motion equation before calculating the horizontal velocity in projectile motion problems?

• The time of flight is determined by vertical displacement.

• The horizontal velocity changes with time.

• The vertical and horizontal motions are dependent.

• The initial speed is always known.

Given the equation Δy = vᵧᵢt + ½gt², what does the term ½gt² represent?

• The initial vertical velocity

• The effect of gravity on vertical displacement

• The horizontal displacement

• The total time of flight

A 14 kg boulder is pushed off a cliff with velocity v = (14.0 m/s)x̂ + (2.0 m/s)ŷ. Will the object experience a larger vertical or horizontal acceleration?

• Larger vertical acceleration

• Larger horizontal acceleration

• Equal vertical and horizontal acceleration

• No acceleration in either direction

Is the vertical motion of a golf ball hit into the air uniform?

• Yes, because gravity does not affect vertical motion

• No, because vertical acceleration due to gravity is present

• Yes, because the ball moves at constant speed vertically

• No, because horizontal velocity affects vertical motion

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Which graph best represents the acceleration vs. time for the horizontal motion of a projectile?

• A horizontal line at zero

• A line increasing with time

• A line decreasing with time

• A vertical line

Tags

NGSS.HS-PS2-1