Two identical cars are traveling around the same curve on a highway. One of them is moving at 60 mph, and the other is moving at 30 mph. The centripetal force acting on the car moving at 60 mph is __________ the value of the centripetal force acting on the car moving at 30 mph.
a. one quarter
b. one half
c. the same as
d. twice
e. four times
[Ques. 2] The frequency of a body oscillating from a spring on the Moon is___________ the frequency of the same body oscillating from the same spring on Earth.
a. the same as
b. larger than
c. smaller than
d. not related to
e. depending on the mass, smaller or larger than
[Ques. 3] If object A has more mass than object B,
a. A will weigh more than B.
b. A will be harder to accelerate than B.
c. A will be harder to keep moving in a circle.
d. all of the above
[Ques. 4] You whirl a 2-kg body attached to a 1-meter cord around your head in a nearly horizontal circle with a speed of 4 m/s. The tension in the cord is
a. 2 N.
b. 4 N.
c. 8 N.
d. 16 N.
e. 32 N.
[Ques. 5] Two forces of 4 N and 12 N act on a body simultaneously. The net force on the body is
a. 4 N.
b. 12 N.
c. 16 N.
d. 8 N.
e. impossible to tell from the given information.
[Ques. 6] Starting from rest, a 2-kg body acquires a speed of 8 m/s in 2 seconds. The net force acting on the body is
a. 2 N.
b. 4 N.
c. 8 N.
d. 16 N.
e. 6 N.
[Ques. 7] You push on a block on frictionless ice with a force of 8 N, causing it to accelerate at 2 m/s2 . The mass of the block is
a. 2 kg.
b. 4 kg.
c. 8 kg.
d. 16 kg.
e. 6 kg.
[Ques. 8] Which is larger, a newton or a pound?
a. a newton
b. a pound
c. This question is nonsensethey don't measure the same physical quantity.
d. They are the same size.
[Ques. 9] If the net force on an object is zero,
a. there must be no forces acting on the object.
b. the object must be at rest.
c. the object's acceleration must be zero.
d. there can be no friction acting on the object.
[Ques. 10] The force that keeps your feet from sliding as you walk is
a. centripetal force.
b. weight.
c. kinetic friction.
d. static friction.
e. none of the above.
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