Dynamics-Ch.12-6

1.The downward acceleration of an object in free-flight motion is

• zero
• increasing with time
• 9.81 m/s²
• 9.81 ft^/s2

The horizontal component of velocity remains _________ during a free-flight motion.

• zero
• constant
• at 9.81 m/s2
• at 32.2 ft/s2

In a projectile motion problem, what is the maximum number of unknowns that can be solved?

• 1
• 2
• 3
• 4

The time of flight of a projectile, fired over level ground, with initial velocity Vo at angle θ, is equal to?

• (v_o sin (Theta))/g
• (2v_o sin (Theta))/g
• (v_o cos (Theta))/g
• (2v_o cos (Theta))/g

A projectile is given an initial velocity   v_o at an angle Phi above the horizontal.   The velocity of the projectile when it hits the slope is ____________ the   initial velocity vo.

• less than
• equal to
• greater than
• None of the above

A particle has an initial velocity v_o at angle Phi with respect to the horizontal.  The maximum height it can reach is when

• Phi = 30°
• Phi = 45°
• Phi = 60°
• Phi = 90°