Transcript e. force times distance.

The momentum of an object is
defined as the object's
a. mass times its velocity.
b. force times the time interval.
c.
force times its acceleration.
d. mass times it acceleration.
e. velocity times the time
interval.
The momentum of an object is
defined as the object's
a. mass times its velocity.
b. force times the time interval.
c.
force times its acceleration.
d. mass times it acceleration.
e. velocity times the time
interval.
Which has more momentum, a
large truck moving at 30 miles
per hour or a small truck moving
at 30 miles per hour?
a. Both have the same
momentum.
b. The small truck
c. The large truck
Which has more momentum, a
large truck moving at 30 miles
per hour or a small truck moving
at 30 miles per hour?
a. Both have the same
momentum.
b. The small truck
c. The large truck
Compared to a sports car moving
at 30 miles per hour, the same
sports car moving at miles per
hour has
a. twice as much momentum.
b. four times as much
momentum.
c. the same momentum.
Compared to a sports car moving
at 30 miles per hour, the same
sports car moving at miles per
hour has
a. twice as much momentum.
b. four times as much
momentum.
c. the same momentum.
A 2-kg ball is thrown at 3 m/s.
What is the ball's momentum?
a.
b.
c.
d.
e.
2 kg·m/s
3 kg·m/s
6 kg·m/s
9 kg·m/s
none of the above
A 2-kg ball is thrown at 3 m/s.
What is the ball's momentum?
a.
b.
c.
d.
e.
2 kg·m/s
3 kg·m/s
6 kg·m/s
9 kg·m/s
none of the above
The momentum change of an
object is equal to the
a. impulse acting on it.
b. velocity change of the
object.
c. force acting on it.
d. force acting on it times its
velocity.
e. object's mass times the
force acting on it.
The momentum change of an
object is equal to the
a. impulse acting on it.
b. velocity change of the
object.
c. force acting on it.
d. force acting on it times its
velocity.
e. object's mass times the
force acting on it.
In order to catch a ball, a baseball
player moves his or her hand backward
in the direction of the ball's motion.
Doing this reduces the force of impact
on the player's hand principally
because
a.
the time of impact is decreased.
b.
the time of impact is increased.
c.
the velocity of the hand is
reduced.
d.
the momentum of impact is
reduced.
e.
none of the above
In order to catch a ball, a baseball
player moves his or her hand backward
in the direction of the ball's motion.
Doing this reduces the force of impact
on the player's hand principally
because
a.
the time of impact is decreased.
b.
the time of impact is increased.
c.
the velocity of the hand is
reduced.
d.
the momentum of impact is
reduced.
e.
none of the above
Suppose a girl is standing on a pond
where there is no friction between her
feet and the ice. In order to get off the
ice, she can
a.
bend over touching the ice in
front of her and then bring her feet to
her hands.
b.
walk very slowly on tiptoe.
c.
get on her hands and knees and
crawl off the ice.
d.
throw something in the direction
opposite to the way she wants to go.
e.
all of the above will work
Suppose a girl is standing on a pond
where there is no friction between her
feet and the ice. In order to get off the
ice, she can
a.
bend over touching the ice in front
of her and then bring her feet to her
hands.
b.
walk very slowly on tiptoe.
c.
get on her hands and knees and
crawl off the ice.
d.
throw something in the
direction opposite to the way she
wants to go.
e.
all of the above will work
A cannon recoils from launching a
cannonball. The speed of the cannon's
recoil is small because the
a.
impulse on the cannon is less
than the impulse on the cannonball.
b.
cannon has far more mass than
the cannonball.
c.
momentum of the cannon is
unchanged.
d.
force against the cannon is
relatively small.
e.
none of the above
A cannon recoils from launching a
cannonball. The speed of the cannon's
recoil is small because the
a.
impulse on the cannon is less
than the impulse on the cannonball.
b.
cannon has far more mass than
the cannonball.
c.
momentum of the cannon is
unchanged.
d.
force against the cannon is
relatively small.
e.
none of the above
In physics, work is defined as
a.
b.
c.
d.
e.
force times time.
force divided by distance.
distance divided by time.
force divided by time.
force times distance.
In physics, work is defined as
a.
b.
c.
d.
e.
force times time.
force divided by distance.
distance divided by time.
force divided by time.
force times distance.
If Nellie Newton pushes an
object with twice the force for
twice the distance, she does
a.
b.
c.
d.
twice the work.
the same work.
four times the work.
eight times the work.
If Nellie Newton pushes an
object with twice the force for
twice the distance, she does
a.
b.
c.
d.
twice the work.
the same work.
four times the work.
eight times the work.
Which requires more work: lifting a
70-kg sack vertically 2 meters or
lifting a 35-kg sack vertically 4
meters?
a. Lifting the 70 kg sack
b. Lifting the 35 kg sack
c. Both require the same
amount of work.
Which requires more work: lifting a
70-kg sack vertically 2 meters or
lifting a 35-kg sack vertically 4
meters?
a. Lifting the 70 kg sack
b. Lifting the 35 kg sack
c. Both require the same
amount of work.
Power is defined as the
a.
force on an object divided by
the time the force acts.
b.
work done times the time taken
to do that work.
c.
work done on an object divided
by the time taken to do the work.
d.
distance divided by the time
taken to move that distance.
e.
force on an object times the
distance the object moves.
Power is defined as the
a.
force on an object divided by
the time the force acts.
b.
work done times the time taken
to do that work.
c.
work done on an object
divided by the time taken to do the
work.
d.
distance divided by the time
taken to move that distance.
e.
force on an object times the
distance the object moves.
A job is done slowly, and an
identical job is done quickly. Both
jobs require the same amount of
work but different amounts of
a.
b.
c.
d.
energy.
power.
both A and B
none of the above
A job is done slowly, and an
identical job is done quickly. Both
jobs require the same amount of
work but different amounts of
a.
b.
c.
d.
energy.
power.
both A and B
none of the above
Mechanical energy can be in
the form of
a. kinetic energy.
b. potential energy.
c. both kinetic and potential
energy.
d. neither kinetic nor potential
energy.
Mechanical energy can be in
the form of
a. kinetic energy.
b. potential energy.
c. both kinetic and
potential energy.
d. neither kinetic nor potential
energy.
The amount of potential energy
possessed by an elevated
object is equal to
a. the power used to lift it.
b. the distance it is lifted.
c. the force needed to lift it.
d. the work done in lifting it.
e. the value of the
acceleration due to gravity.
The amount of potential energy
possessed by an elevated
object is equal to
a. the power used to lift it.
b. the distance it is lifted.
c. the force needed to lift it.
d. the work done in lifting
it.
e. the value of the
acceleration due to gravity.
An object at rest may have
a.
b.
c.
d.
e.
energy.
speed.
velocity.
momentum.
none of the above
An object at rest may have
a.
b.
c.
d.
e.
energy.
speed.
velocity.
momentum.
none of the above
When a car’s speed triples, its
kinetic energy
a.
b.
c.
d.
e.
remains the same.
triples.
increases by four times.
increases by nine times.
none of the above
When a car’s speed triples, its
kinetic energy
a.
b.
c.
d.
e.
remains the same.
triples.
increases by four times.
increases by nine times.
none of the above
An arrow in a bow has 70 J of
potential energy. Assuming no
loss of energy to heat, how
much kinetic energy will it have
after it has been shot?
a.
b.
c.
d.
e.
0J
35 J
50 J
70 J
140 J
An arrow in a bow has 70 J of
potential energy. Assuming no
loss of energy to heat, how
much kinetic energy will it have
after it has been shot?
a.
b.
c.
d.
e.
0J
35 J
50 J
70 J
140 J
A 40-kg football player leaps
through the air to collide with and
tackle a 50-kg player heading
toward him, also in the air. If the
40-kg player is heading to the
right at 9 m/s and the 50-kg player
is heading toward the left at 2 m/s,
what is the speed and direction of
the tangled players?
Discuss how energy is
transformed form one form to
another in a swinging
pendulum. Where is potential
energy the most? The least?
Where is kinetic energy the
most? The least? Where is it
moving the fastest? Where is it
stopped? Why does the
pendulum eventually stop?