Transcript Which of the following are pure substances?

Chapter 4-7, 20-22
Benchmark Review activity!
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What is the slope of a line on a
distance-time graph?
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A. distance.
B. time.
C. speed.
D. displacement.
A horizontal line on a distance-time
graph means the object is
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A. moving at a constant speed.
B. moving faster.
C. slowing down.
D. at rest.
The rate at which velocity changes
is called
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A. acceleration.
B. motion.
C. vectors.
D. speed.
An object that is accelerating may
be
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A. slowing down.
B. gaining speed.
C. changing direction.
D. all of the above
When an unbalanced force acts
on an object,
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A. the object’s motion does not change.
B. the object accelerates.
C. the object will stop.
D. the inertia of the object increases.
The net forces acting on any
object will cause it to
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A. keep moving at the same speed.
B. accelerate.
C. stop.
D. swim like a fish.
If a 10 N net forces acts on a 20
kg object it will accelerate at
(a=f/m)
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A. 5 m/s
B. 200 m/s
C. 0.5 m/s2
D. 2 m/s2
What force is needed to
accelerate a 4 kg ball at 12
m/s2? (a=f/m)
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A. 3 m/s
B. 48 m/s
C. 0.75 N
D. 48 N
The property of matter that resists
changes in motion is called
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A. centripetal motion.
B. friction.
C. inertia.
D. projectile motion.
Inertia is related to
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A. speed.
B. weight.
C. mass.
D. Uncle Joe.
An orange might roll off your cafeteria
tray when you stop suddenly because
of
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A. the balanced forces acting on the orange.
B. the friction forces acting on the orange.
C. the centripetal force acting on the orange.
D. the orange’s inertia.
According to Newton’s second law, the
acceleration equals the net force
divided by the object’s
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A. mass.
B. velocity.
C. momentum.
D. weight.
Your weight equals your
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A. mass
B. mass divided by the net force acting on it.
C. mass times acceleration due to gravity.
D. mass times your speed.
When one object exerts a force
on another,
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A. the objects will always move as a result of
the interaction.
B. an equal and opposite force is exerted back
on it by the other object.
C. the objects will never move due to the
forces cancelling each other out.
D. one object will always exert a greater force
on the other object.
What is the momentum of a
truck at rest?
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A. Zero
B. Equal to the mass.
C. Equal to the weight.
D. Trucks do not need to rest.
If a golf ball and marble are rolling at the
same speed, which has a greater
momentum?
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A. Golf ball
B. Marble
C. They have the same.
D. I lost my marbles a long time ago!
The product of an object’s mass
and velocity is its
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A. centripetal force.
B. net force.
C. momentum.
D. weight.
P
= mv
If you double your speed, your
kinetic energy becomes:
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A. 2 times smaller.
B. 4 times smaller.
C. 2 times bigger.
D. 4 times bigger.
What happens to the kinetic energy
of an object if you double the
mass?
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A. 2 times smaller.
B. 4 times smaller.
C. 2 times bigger.
D. 4 times bigger.
Bill lifts a 25-kg child from the ground
onto a 1.5 meter high table. What is the
potential energy of the child?
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A. 37.5 J
B. 16.67 J
C. 367.5 J
D. None! A child never has potential.
How high would you need to lift a 5-kg
box to increase its potential energy by
1000 joules?
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A. about 5000 m
B. about 500 m
C. about 200 m
D. about 20 m
What is a coulomb?
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A. Unit of energy
B. Unit of charge
C. Unit of current
D. Unit of voltage.
An ohm is the unit of measurement for:
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A. current.
B. voltage.
C. power
D. resistance.
An open circuit:
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A. is on
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B. is off
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C. is left behind
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D. is Ohm’s Law
The term current refers to:
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A. a store at the mall.
B. potential difference.
C. flowing charges.
D. resistance.
The energy carried by each unit of moving
charge in a circuit is called:
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A. wattage.
B. amperage.
C. voltage.
D. resistance.
Electrical current will not pass easily through:
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A. an absorber.
B. a conductor.
C. a semiabsorber.
D. an insulator.
What is Ohm’s Law?
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A. I = V/R
B. V=IR
C. R=V/I
D. all of these
If 8.0 amperes of current flows with a voltage
of 120 volts what is the resistance?
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A. 10 W
B. 15 W
C. 0.067 W
D. 960 W
I = V/R
In the circuit below, 8 amperes of current
passes through the light bulb. The resistance
of the light bulb is 2 ohms. What is the
voltage of the battery?
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A. 16 Volts
B. 4 Volts
C. 32 Volts
D. None of these
A light is plugged into a 120-volt outlet. If it
has a resistance of 360 ohms, how much
current does it use?
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A. 3 amps
B. 42300 amps
C. 0.33 amps
D. None of these
Chapter 21 Review activity!
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What type of circuit is this?
3W
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A. Series
B. Parallel
C. Short
D. None of these
3W
3W
The total resistance for the
circuit shown is:
3W
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A. 1W
B. 3W
C. 6W
D. 9W
3W
3W
The current for the circuit shown is:
1.5W
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A. 1amp
B. 2amps
C. 4.5amps
D. 9amps
1.5W
1.5W
The voltage drop across each
light bulb is ____ volt(s).
3W
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A. 1 v
B. 3 v
C. 6 v
D. 9 v
3W
3W
The voltage drop across each
light bulb is ____ volt(s).
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a = 9 v/ 9 W
a=1a
1 a x 4.5 W = 4.5 v
1ax3W=3v
1 a x 1.5 W = 1.5 v
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1.5W
3W
4.5W
The voltage drop across each
light bulb is ____ volt(s).
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a = 9 v/ 18 W
a = 0.5 a
3W
6W
9W
The total of all voltage drop in a
circuit must:
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A. equal the total current.
B. add up to zero.
C. never exceed the total circuit resistance.
D. add up to the total voltage supplied by the
battery.
When a new branch containing a
resistor is added to a parallel
circuit, the total circuit resistance:
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A. decreases.
B. increases.
C. stays the same.
D. may increase or decrease, depending on
the device.
When a new resistor is added to a
series circuit, the total circuit
resistance:
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A. decreases.
B. increases.
C. stays the same.
D. may increase or decrease, depending on
the device.
The current in each resistor in the
circuit is ____ ampere(s).
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A. 1
B. 3
C. 6
D. 9
The total current in the circuit is
____ ampere(s).
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A. 1
B. 3
C. 6
D. 9
The voltage drop across each light
bulb is ____ volt(s).
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A. 1
B. 3
C. 6
D. 9
The total resistance of the circuit?
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A. 0.5 W
B. 1 W
C. 2 W
D. 6 W
2a
3V
2a
2a
What is the resistance of each
bulb?
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A. 0.5 W
B. 1 W
C. 1.5 W
D. 6 W
2a
3v
2a
2a
If you unscrewed bulb A
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A. only bulb B would go out.
B. only bulb C would go out.
C. only bulb C would go out.
D. bulbs B and C would remain lit.
If you unscrewed bulb C
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A. only bulb B would go out.
B. only bulb C would go out.
C. bulbs B and C would go out.
D. bulbs B and C would remain lit.
Your home is wired in:
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A. series circuits.
B. parallel circuits.
C. Nascar circuits.
D. Open
Power is calculated in a circuit by
multiplying voltage times _____.
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A. resistance.
B. current.
C. power
D. Both A and C
One watt of power is
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A. one joule per hour.
B. one joule per second.
C. 75 watts per hour.
D. Both A and C
Converts electrical energy to
mechanical energy.
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A. a fish.
B. a generator.
C. a motor.
D. a transformer.