What results when the net force on an object increases?
a. Increased acceleration, but there is no way of calculating the increase.
b. Decreased acceleration, but there is no way of calculating the decrease.
c. Decreased acceleration, if the force and the velocity are in opposite directions.
d. Proportionally increased acceleration.
e. No change in the object's motion.
[Ques. 2] Newton's second law relates:
a. acceleration and the resulting speed.
b. net force, mass, and acceleration.
c. mass and speed.
d. gravity and friction.
e. acceleration and the resulting displacement.
[Ques. 3] In representing a vector quantity:
a. the length of the arrow represents the direction of the vector and the direction of the arrow represents the magnitude of the vector.
b. the direction of the arrow represents the magnitude of the vector.
c. the length of the arrow represents the direction of the vector.
d. the width of the line used for the arrow represents the magnitude of the vector and the direction of the arrow represents the direction of the vector.
e. the length of the arrow represents the magnitude of the vector and the direction of the arrow represents the direction of the vector.
[Ques. 4] Which of the following is not a vector?
a. The force that represents your weight.
b. The diameter of Earth.
c. The velocity of a baseball in flight.
d. Your displacement from walking five blocks to the North.
e. The unbalanced force from two people pushing a cart in opposite directions.
[Ques. 5] Which of these is an accurate statement of Newton's first law?
a. An object at rest tends to remain at rest.
b. An object in motion tends to remain in motion.
c. An object with no force acting along its direction of motion tends to move in a circle at constant speed.
d. In the absence of an unbalanced force, the velocity of an object remains constant.
e. In the absence of an unbalanced force, the speed of an object remains constant.
[Ques. 6] Which statement is true about Newton's first law of motion?
a. It was completely invented by Newton.
b. It was an addition to and improvement of Galileo's observations.
c. It was just a better way to state what Galileo had learned a long time before.
d. It restated the ideas of Aristotle.
e. Newton, according to legend, formulated it upon seeing an apple fall to the ground.
[Ques. 7] The demonstration in this figure is often shown as a magician's trick. What in fact is the trick?
a. When the magician yanks the tablecloth rapidly, the inertia of the dishes prevents them from accelerating significantly during the short time the force of friction from the moving tablecloth acts.
b. The magician uses magnets or some other external device to keep the dishware in place.
c. The tablecloth has almost zero mass, or inertia. Hence, it is easy to pull away from the dishware.
d. The mass of the tablecloth prevents it from accelerating rapidly enough to exert much force on the dishes.
e. The dishes have much less inertia than the tablecloth.
[Ques. 8] In Galileo's thought experiment about rolling balls, Galileo argued that:
a. a ball rolling up the tilted surface speeds up.
b. a ball rolling down the tilted surface slows down.
c. a ball rolling on a level surface speeds up.
d. a ball rolling on a the level surface continues at the same speed.
e. a ball rolling on a level surface slows down.
[Ques. 9] According to the Aristotelian view of motion, which of these would NOT work?
a. An arrow flying away from a bow.
b. A stone dropping through water to the creek bed.
c. An apple falling from a tree to the ground.
d. A person climbing a tree.
e. A rocket ship going to the moon.
[Ques. 10] A skilled ballet dancer appears to move in a seemingly floating motion, seeming to defy gravity in a grand jet. Part of how this is done is by:
a. moving her arms and legs to keep her center of mass at the about same height above the ground.
b. moving her arms and legs to cause her center of mass to move upward while falling.
c. being supported from the ceiling by a hidden cable not visible to the audience.
d. moving her arms and legs so that as her center of mass moves, she keeps her head at the same height above the ground.
e. moving her arms and legs so that her center of mass is kept from accelerating downward.
Quick Reply
