PHYS 130 C exam 2 cypress college
What is the momentum of a 9-kg bowling ball rolling at 2 m/s? - CORRECT ANSWER-
18 m/s momentum = mass x velocity
What impulse occurs when an average force of 10 N is exerted on a cart for 3 s? -
CORRECT ANSWER-30 m/s impulse = force x time
What is the impulse on a 9-kg ball rolling at 2 m/s when it bumps into a basket and
stops? - CORRECT ANSWER-18 kg m/s impulse = mass x velosity
A 2-kg blob of play dough moving at 3 m/s slams into a 2-kg blob of play dough at rest.
Show how the speed of the two stuck-together blobs immediately after colliding -
CORRECT ANSWER-1.5 m/s
Distinguish between force and impulse. - CORRECT ANSWER-Force is any influence
that tends to accelerate an object. Impulse is the change of momentum depending on
force and time.
How does momentum relate to inertia? - CORRECT ANSWER-Inertia is the resistance
offered by a body to the motion whereas momentum is the tendency of a body to
continue moving.
What are two ways to increase impulse? - CORRECT ANSWER-Impulse can also be
increased by increasing the time interval or by increasing the magnitude of change in
momentum. The change in momentum can be increased by increasing the velocity of
the body.
What does it mean to say that momentum (or any quantity) is conserved? - CORRECT
ANSWER-the quantity called momentum that characterizes motion never changes in an
isolated collection of objects;
In which type or kind of collision is momentum conserved: elastic or inelastic? -
CORRECT ANSWER-Momentum is conserved in inelastic collisions, but one cannot
track the kinetic energy through the collision since some of it is converted to other forms
of energy.
Two automobiles, each of mass 1000 kg, are moving at the same speed, 20 m/s, when
they collide and stick together. Cite the direction and speed the wreckage moves when
one car was driving north and one south. - CORRECT ANSWER-given,
mass of two automobile = 1000 kg
speed of the two automobile = 20 m/s
What is the momentum of a 9-kg bowling ball rolling at 2 m/s? - CORRECT ANSWER-
18 m/s momentum = mass x velocity
What impulse occurs when an average force of 10 N is exerted on a cart for 3 s? -
CORRECT ANSWER-30 m/s impulse = force x time
What is the impulse on a 9-kg ball rolling at 2 m/s when it bumps into a basket and
stops? - CORRECT ANSWER-18 kg m/s impulse = mass x velosity
A 2-kg blob of play dough moving at 3 m/s slams into a 2-kg blob of play dough at rest.
Show how the speed of the two stuck-together blobs immediately after colliding -
CORRECT ANSWER-1.5 m/s
Distinguish between force and impulse. - CORRECT ANSWER-Force is any influence
that tends to accelerate an object. Impulse is the change of momentum depending on
force and time.
How does momentum relate to inertia? - CORRECT ANSWER-Inertia is the resistance
offered by a body to the motion whereas momentum is the tendency of a body to
continue moving.
What are two ways to increase impulse? - CORRECT ANSWER-Impulse can also be
increased by increasing the time interval or by increasing the magnitude of change in
momentum. The change in momentum can be increased by increasing the velocity of
the body.
What does it mean to say that momentum (or any quantity) is conserved? - CORRECT
ANSWER-the quantity called momentum that characterizes motion never changes in an
isolated collection of objects;
In which type or kind of collision is momentum conserved: elastic or inelastic? -
CORRECT ANSWER-Momentum is conserved in inelastic collisions, but one cannot
track the kinetic energy through the collision since some of it is converted to other forms
of energy.
Two automobiles, each of mass 1000 kg, are moving at the same speed, 20 m/s, when
they collide and stick together. Cite the direction and speed the wreckage moves when
one car was driving north and one south. - CORRECT ANSWER-given,
mass of two automobile = 1000 kg
speed of the two automobile = 20 m/s
