PHYSICS CONCEPTS
An object is moving at a constant velocity- What can NOT be true?
a single force that acting on the object
A rabbit's foot is hanging on a chain from the rearview mirror of a car. As the car
accelerates, the rabbit's foot swings toward the windshield is an example of a
violation of
newton's 1st law -the rabbit's foot would swing away from, not toward, the windshield
A cup of coffee is sitting on a table in a recreational vehicle (RV). The cup slides
toward the rear of the RV. According to Newton's first law, which one or more of
the following statements could describe the motion of the RV? (A) The RV is at
rest, and the driver suddenly accelerates. (B) The RV is moving forward, and the
driver suddenly accelerates. (C) The RV is moving backward, and the driver
suddenly hits the brakes
ALL THREE
The apparent weight of a passenger in an elevator is greater than his true weight.
Which one of the following is true?
The elevator is either moving upward with an increasing speed or moving downward
with a decreasing speed
A force Facts on an object undergoing a displacement S, the force being oriented
at an angle θ with respect to the displacement. Which one of the following
correctly describes ALL of the circumstances under which the work done by the
force is zero?
The force is zero, or the displacement is zero, or the angle is 90°
A nonzero net force acts on a particle and does work. Which one of the following
statements is true
The kinetic energy, speed, and velocity of the particle change
Two forces Fand F2 act on a particle. As a result the speed of the particle
increases. Which one of the following is NOT possible
The work done by each force is negative
A person is riding on a Ferris wheel. When the wheel makes one complete turn,
the net work done on the person by the gravitational force is?
zero
Air resistance is a nonconservative force. It always opposes the motion of an
object. An airplane flies from New York to Atlanta and then returns to its point of
departure. The net work done by air resistance during this round trip
is always negative
In which one of the following circumstances does the principle of conservation of
mechanical energy apply, even though a nonconservative force acts on the
moving object
The nonconservative force is perpendicular to the displacement of the object
A high-jumper, having just cleared the bar, lands on an air mattress and comes to
rest. Had she landed directly on the hard ground, her stopping time would have
been much shorter. Using the impulse-momentum theorem as your guide,
determine which one of the following statements is correct
An object is moving at a constant velocity- What can NOT be true?
a single force that acting on the object
A rabbit's foot is hanging on a chain from the rearview mirror of a car. As the car
accelerates, the rabbit's foot swings toward the windshield is an example of a
violation of
newton's 1st law -the rabbit's foot would swing away from, not toward, the windshield
A cup of coffee is sitting on a table in a recreational vehicle (RV). The cup slides
toward the rear of the RV. According to Newton's first law, which one or more of
the following statements could describe the motion of the RV? (A) The RV is at
rest, and the driver suddenly accelerates. (B) The RV is moving forward, and the
driver suddenly accelerates. (C) The RV is moving backward, and the driver
suddenly hits the brakes
ALL THREE
The apparent weight of a passenger in an elevator is greater than his true weight.
Which one of the following is true?
The elevator is either moving upward with an increasing speed or moving downward
with a decreasing speed
A force Facts on an object undergoing a displacement S, the force being oriented
at an angle θ with respect to the displacement. Which one of the following
correctly describes ALL of the circumstances under which the work done by the
force is zero?
The force is zero, or the displacement is zero, or the angle is 90°
A nonzero net force acts on a particle and does work. Which one of the following
statements is true
The kinetic energy, speed, and velocity of the particle change
Two forces Fand F2 act on a particle. As a result the speed of the particle
increases. Which one of the following is NOT possible
The work done by each force is negative
A person is riding on a Ferris wheel. When the wheel makes one complete turn,
the net work done on the person by the gravitational force is?
zero
Air resistance is a nonconservative force. It always opposes the motion of an
object. An airplane flies from New York to Atlanta and then returns to its point of
departure. The net work done by air resistance during this round trip
is always negative
In which one of the following circumstances does the principle of conservation of
mechanical energy apply, even though a nonconservative force acts on the
moving object
The nonconservative force is perpendicular to the displacement of the object
A high-jumper, having just cleared the bar, lands on an air mattress and comes to
rest. Had she landed directly on the hard ground, her stopping time would have
been much shorter. Using the impulse-momentum theorem as your guide,
determine which one of the following statements is correct
