When does kinetic friction occur in trying to push a heavy object?
a. When the object is still.
b. When the force you apply is smaller than the maximum static frictional force.
c. Just before enough force is applied to move the object.
d. When the force you apply is larger than the maximum static frictional force.
e. When the force you apply is insufficient to set the object in motion.
[Ques. 2] Which statement about terminal speed is true?
a. Terminal speed is the same for all objects.
b. Terminal speed is not affected by weight.
c. Terminal speed is not affected by air resistance.
d. Terminal speed is not affected by size and shape.
e. Terminal speed is affected by size, weight, and shape.
[Ques. 3] As the rock in this figure falls after being dropped from a great height:
a. its speed increases until it reaches a constant value, but its acceleration decreases gradually to zero.
b. its speed continues to increase while its acceleration goes to zero.
c. both the speed and the acceleration increase.
d. its speed decreases while its acceleration continues to increase.
e. its speed slows to zero while its acceleration reaches a terminal value.
[Ques. 4] Imagine that you are pulling your little sister on a sled and that the sled is speeding up. The diagram shown here is the free-body diagram for the sled. The net force on the sled in the vertical (up/down) direction is _________, but the net force in the horizontal direction is _________.
a. zero/zero
b. zero/pointing to the right
c. zero/pointing to the left
d. pointing upward/zero
e. pointing downward/zero
[Ques. 5] What is another simple way to describe the weight of an object?
a. The mass of that object.
b. The mass of that object at an acceleration of 1 m/s2.
c. The magnitude of the force attracting it toward Earth's surface.
d. The height of that object.
e. The acceleration of that object.
[Ques. 6] The net force always points in the same direction as:
a. the displacement.
b. the frictional force.
c. the velocity.
d. the force of gravity.
e. the acceleration.
[Ques. 7] The unit of measure called the newton is:
a. the force needed to accelerate a 1-kilogram mass at 1 meter per second per second.
b. the force needed to accelerate a 1-pound mass at 1 ft/s2.
c. the acceleration resulting when a 1-kilogram mass moves 1 m/s2.
d. the acceleration of a 1-pound mass moving at 1 m/s2.
e. the force needed to accelerate a 1-kilogram mass to a speed of 1 m/s.
[Ques. 8] If objects on the Moon weigh 1/6 the amount they weigh on Earth, what should one conclude about the mass of objects on the Moon?
a. Nothing. The mass of objects are the same everywhere.
b. The mass of objects are 1/6 as much on the Moon as on Earth.
c. Objects on the Moon have the same mass as they do on Earth, but they appear to weigh less because of the absence of an atmosphere on the Moon.
d. The mass becomes zero on the Moon because orbiting Earth removes the effect of gravitation.
e. The mass on the Moon will be 6 times as large as on Earth.
[Ques. 9] Newton's second law of motion in the form of an equation is:
a. acceleration = mass force.
b. mass = acceleration force.
c. energy = mass the square of the speed of light.
d. force = mass acceleration.
e. force = mass + acceleration.
[Ques. 10] In Newton's second law, mass and acceleration for constant force are:
a. not related.
b. inversely proportional.
c. directly proportional.
d. additive.
e. two ways of describing the same thing.
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