The force needed to make an object move in a circle is
a. centripetal force.
b. weight.
c. kinetic friction.
d. static friction.
e. none of the above.
[Ques. 2] The SI units of acceleration are
a. mi/h.
b. km/h.
c. m/s.
d. m/s2.
e. none of the above
[Ques. 3] The SI units of velocity are
a. mi/h.
b. km/h.
c. m/s2.
d. m/s.
e. none of the above
[Ques. 4] An example of an action at a distance force is
a. tension.
b. weight.
c. static friction.
d. kinetic friction.
e. none of the above
[Ques. 5] The acceleration of a body is
a. always in the same direction as its velocity.
b. always in the same direction as the net force on the body.
c. in the direction that the body is moving.
d. equal to the net force on the body.
e. none of the above.
[Ques. 6] A ball on a string is being whirled around overhead when the string breaks. The ball will move in the direction of the centripetal force the moment the string breaks.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 7] A satellite orbiting the Earth in a circular orbit at 400 miles from the center of Earth is moved to a distance of 1,200 miles from the center of Earth. The gravitational force between the Earth and satellite changes by a factor of 3.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 8] An aircraft weighing 1,500 N has a mass of 153 kg.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 9] An aircraft weighing 1,500 N is accelerated at 15 m/s2, the force acting on the aircraft is 2,295.9 N.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 10] As an artillery shell travels from the gun to the target, the projectile's vertical speed changes, but its horizontal speed stays constant.
a. True
b. False
Indicate whether the statement is true or false
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