Unit 3 Quiz 1 Practice Questions

 

1.A projectile is fired with a velocity of 150. m/s at an angle of 30o with the horizontal.
What is the magnitude of the vertical component of the velocity at the time the projectile is fired ?
75.0 m/s   130. m/s   150. m/s   225 m/s


2.A 1 kg object is thrown horizontally and a 2 kg object is dropped vertically at the same instant and from
the same point above the ground. If friction is neglected, at any given instant both objects will have the same
kinetic energy   momentum   total velocity   height


3.A projectile is launched at an angle of 60o above the horizontal. Compared to the vertical component of the initial velocity,
the vertical component of the projectile's velocity when it has reached its maximum height is
less   greater   the same


Questions 4 through 6 : A ball is kicked at an angle of 30o from the horizontal. The ball has an initial velocity of 5.0 m/s.
[Neglect friction.]

4.What is the magnitude of the horizontal component of the ball's initial velocity ?
2.5 m/s   4.3 m/s   5.0 m/s   8.7 m/s


5.As the ball rises, the vertical component of its velocity
decreases   increases   remains the same


6.If the angle between the horizontal and the direction of the 5.0 m/s velocity decreases from 30o to 20o,
the horizontal distance the ball travels will
decrease   increase   remain the same




7.Arrow A is shot horizontally from a bow at a speed of 50 m/s. Arrow B is dropped from the same height and at the same instant as
A is fired. Compared to the amount of time A takes to strike the ground, the amount of time B takes to strike the ground is
less   greater   the same


Questions 8 through 10 : An object is thrown horizontally off a cliff with an initial velocity of 5.0 m/s.
The object strikes the ground 3.0 s later.

8.What is the vertical speed of the object as it reaches the ground ? [Neglect friction.]
130 m/s   29 m/s   15 m/s   5.0 m/s


9.How far from the base of the cliff will the object strike the ground ? [Neglect friction.]
2.9 m   9.8 m   15 m   44 m


10.What is the horizontal speed of the object 1.0 s after it is released ? [Neglect friction.]
5.0 m/s   10. m/s   15 m/s   30. m/s