As a body falls through air starting from rest, its velocity
a. stays constant.
b. continuously decreases.
c. continuously increases.
d. gets larger and larger, eventually reaching a constant value.
e. gets smaller and smaller, eventually approaching zero.
[Ques. 2] As a body falls through air starting from rest, its acceleration
a. is zero.
b. stays constant.
c. continuously decreases.
d. continuously increases.
e. gets smaller and smaller, eventually approaching zero.
[Ques. 3] At the highest point on the path of a projectile, its vertical acceleration
a. equals g pointing downwards.
b. equals g pointing upwards.
c. is zero.
d. is undetermined.
e. does not exist.
[Ques. 4] Where is the Sun located relative to a planet's orbit about it?
a. at the center of the orbit, which is a circle
b. at the center of the orbit, which is an ellipse
c. at one focus of the ellipse which forms the orbit
d. none of the above
[Ques. 5] Planetary orbits are
a. parabolas. b. ellipses.
c. circles. d. none of the above.
[Ques. 6] The vertical acceleration of a projectile
a. equals g pointing downwards.
b. equals g pointing upwards.
c. equals g pointing sometimes upwards and other times downwards.
d. is zero.
e. continuously increases.
[Ques. 7] The horizontal acceleration of a projectile
a. is zero.
b. stays constant.
c. continuously increases.
d. continuously decreases.
e. sometimes decreases and sometimes increases.
[Ques. 8] The vertical speed of a projectile
a. is zero.
b. stays constant.
c. continuously increases.
d. continuously decreases.
e. sometimes decreases and sometimes increases.
[Ques. 9] The horizontal speed of a projectile
a. is zero.
b. stays constant.
c. continuously increases.
d. continuously decreases.
e. sometimes decreases and sometimes increases.
[Ques. 10] You throw a ball straight up, it peaks out, and then comes back down to you. During this motion, the velocity and acceleration
a. always point in the same direction.
b. always point opposite to each other.
c. sometimes point in the same direction, and other times point opposite to each other.
d. depend on the way the ball is thrown.
e. depend on the mass of the ball.
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