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Test Practice electrical mechanical

Total questions: 56

Worksheet time: 38mins

Name
Class
Date
1.

Suppose that an astronaut throws a baseball in outer space at a location far from significant influences of gravity and air resistance. One would expect that the baseball would ____.

a)

eventually stop since all objects ultimately "lose their steam"

b)

eventually stop as its inertia slowly becomes used up

c)

continue in motion with the same speed and direction

d)

either a, b, or c -- depending on whether the astronaut continues to push it

2.

The law of inertia (Newton's first law) applies _____.

a)

to moving objects only

b)

only to objects that are not moving

c)

to both moving and nonmoving objects

3.

Inertia refers to _____

a)

the tendency of moving objects to remain in motion

b)

the force which keeps moving objects in motion with a constant velocity

c)

the force that keeps stationary objects at rest

d)

the tendency of stationary objects to remain at rest

4.

A skateboard rolls down a hill, reaches the level surface and eventually comes to a stop. The fact that the skateboard ultimately stops is best explained by ____.

a)

an unbalanced force would be required to keep the sled moving forward at constant speed

b)

the presence of an unbalanced force (e.g., friction) can cause a moving object to stop

c)

the presence of inertia causes it to stop

d)

the natural tendency of any object is to ultimately stop

5.

Inertia depends on ______

a)

Velocity

b)

Speed

c)

Distance

d)

Mass

6.

List the objects in order from least to greatest inertia.

a)

CDBA

b)

ABCD

c)

BCDA

d)

CBAD

7.

An astronaut kicks a soccer ball in outer space at a location far from significant influences of gravity and air resistance. The soccer ball will _________.

a)

continue in motion with the same speed and direction

b)

eventually stop as its inertia slowly becomes used up

c)

eventually stop since all objects ultimately "lose their steam"

d)

either a, b, or c -- depending on whether the astronaut continues to kick it

8.

More mass = More inertia

a)

True

b)

False

9.

Inertia is the tendency of an object to resist a change in its ___________.

a)

temperature

b)

shape

c)

size

d)

motion

10.
Objects with greater _________ also have greater inertia.
a)
speed
b)
mass
c)
temperature
d)
friction
11.
Because of inertia, a resting object will remain at ________.
a)
rest
b)
a constant speed
c)
school
d)
inertia 
12.
Because of inertia, a moving object will keep ________.
a)
at rest
b)
moving
c)
in one spot
d)
inertia 
13.

Inertia is Newton's _______ Law of Motion.

a)

First

b)

Second

c)

Third

14.

What is the relationship between heavy objects and inertia?

a)

Only heavy objects have inertia.

b)

Heavy objects have more inertia.

c)

Heavy objects have less inertia.

d)

Heavy objects have no inertia.

15.

Diagram 3 shows a cat chasing a rat. The inertia of the cat is bigger than the rat because.

a)

The size of the cat is bigger than the rat

b)

The length of the cat is more than the rat

c)

The mass of the cat is bigger than the rat

16.

While you’re ice-skating with your friends, you push off from one end of the rink and slide forward. Based on Newton’s first law of motion, what is true?

a)

You will lose your balance and fall over before you reach the middle of the ice rink.

b)

You will continue to slide across the ice until a force makes you stop or change direction.

c)

The force of gravity will make you keep your velocity until your friend makes you stop.

d)

The size of your ice skates will determine how quickly or slowly you travel across the ice.

17.
Which of the following is an example of inertia?
a)
Slamming on the breaks in your car and flying forward.
b)
An apple falling off of a tree. 
c)
Running at a cross country event. 
18.

Which explains why the tablecloth trick works?

a)

The dishes are stuck in place due to air resistance.

b)

The tablecloth is an ilusion.

c)

The dishes have inertia, and therefore stay on the table.

d)

magic

19.
Newton's second law of motion describes acceleration as force divided by __________.
a)
mass
b)
inertia
c)
speed
d)
direction
20.
According to __________, the acceleration of an object is equal to the net force acting on the object divided by the object's mass. 
a)
Newton's Second Law
b)
Newton's Third Law
c)
Newton's First Law
21.

F= mass * acceleration

A 20 kg bike accelerates at 10 m/s2. what is the force acting upon it?

a)

25 Newtons

b)

20 Newtons

c)

200 Newtons

d)

10 Newtons

22.

An object of mass 10 kg is accelerated upward at 2 m/s2. What force is required?

a)

20 N

b)

2 N

c)

5 N

d)

0 N

23.
When force is 20 N, mass is 5 kg, what is acceleration?
F = ma
a)
25 m/s/s
b)
5 m/s/s
c)
100 m/s/s
d)
4 m/s/s
24.

Which of Newton's laws best fits with the following statement: Objects at rest tend to stay at rest

a)

First

b)

Second

c)

Third

25.

Which of Newton's laws best fits with the following statement: More mass means more force needed to accelerate

a)

first

b)

second

c)

third

26.

Which of the following is an example of acceleration?

a)

Skiing faster when you go down a hill

b)

Riding your bike straight down the street at a constant speed

c)

Driving your car at 30 mph and not changing the speed

27.

If an objects mass increases with a constant force, the acceleration

a)

increases

b)

decreases

28.

If an object's acceleration decreases while a constant force is applied to the object, the mass will

a)

increase

b)

decrease

c)

stay the same

29.

If an objects force is increased while the acceleration on an object is constant, the mass

a)

increases

b)

decreases

c)

stays the same

30.

Which shows the relationship between acceleration, mass, and net force?

a)

acceleration = force x mass

b)

acceleration = force/mass

c)

acceleration = mass/force

31.

For every action there is an equal and opposite reaction.

a)

Newton's First Law of Motion

b)

Newton's Second Law of Motion

c)

Newton's Third Law of Motion

32.

When you push on a wall, the wall pushes on you.

a)

True

b)

False

33.

If you push on a wall with a force of 30 N, the force acting on you from the wall is which of the following?

a)

0 N

b)

10 N

c)

20 N

d)

30 N

34.
Which law says that for every action there is an equal and opposite reaction?
a)
Newton's First Law of Motion
b)
Newton's Second Law of Motion
c)
Newton's Third Law of Motion
d)
Newton's Fourth Law of Motion
35.
How many Laws of Motion are there?
a)
1
b)
2
c)
3
d)
4
36.
Who was the scientist who gave us the Laws of Motion?
a)
Sir Isaac Newton
b)
Albert Einstein
c)
Galileo Galilei
d)
Aristotle
37.
Which best explains why we are able to accelerate forward when starting to run?
a)
As one leg moves backward, it provides an equal and opposite force for the other foot to move forward.
b)
No acceleration takes place. Runners are always at a fixed velocity.
c)
The striking foot pushes backward against the ground. The friction with the ground provides an equal and opposite force forward.
d)
The runner's upper body quickly leans forward, causing the entire body to begin accelerating forward
38.
Which law explains how rockets are launched into space?
a)
Newton's First Law of Motion
b)
Newton's Second Law of Motion
c)
Newton's Third Law of Motion
d)
Newton's Fourth Law of Motion
39.

As the resistance of a circuit increases, the current will

a)

increase

b)

decrease

c)

stay the same

d)

increase and then decrease

40.
If the current through a circuit is 2 A and the resistance of a light bulb in the circuit is 10 Ohms, what is the voltage difference across the light bulb?
a)
5 V
b)
12 V
c)
0.2 V
d)
20 V
41.

What equation links voltage, current and resistance

a)

V = IR

b)

V = CR

c)

V = I/R

d)

V = R/I

e)

V = C/R

42.

What unit is used to measure resistance?

a)

Ohms

b)

Omega

c)

Volts

d)

Amps

43.

What unit is used to measure current?

a)

Ohms

b)

Omega

c)

Volts

d)

Amps

44.

What is the resistance of a lightbulb that experiences 9 Volts and 3 amps of current?

a)

1/3 ohms

b)

3 ohms

c)

27 ohms

d)

9 ohms

45.

What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?

a)

12 V

b)

21 V

c)

4/3 V

d)

3/4 V

46.
What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?
a)
25 V
b)
10 V
c)
2.5 V
d)
0.4 V
47.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
48.

Speakers need a household voltage of 110 V to push a current of 5.5 A through them. What is the

resistance of the speakers?

a)

10Ω

b)

20Ω

c)

30Ω

d)

40Ω

49.

An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance.

a)

60Ω

b)

120Ω

c)

180Ω

d)

240Ω

50.

An IPod uses a standard 1.5 V battery. How much resistance is in the circuit if it uses a current of 0.01A?

a)

50Ω

b)

100Ω

c)

150Ω

d)

200Ω

51.

A circuit contains a 1.5 volt battery and a bulb with a resistance of 3 ohms. Calculate the current.

a)

0.5A

b)

1A

c)

1.5A

d)

2A

52.

What current flows through a hair dryer plugged into a 120 Volt circuit if it has a resistance of 25 ohms?

a)

2.4A

b)

3.6A

c)

4.8A

d)

6A

53.

Which component converts chemical energy into electrical energy

a)

battery

b)

lightbulb

c)

resistor

d)

LED

54.

Which component converts electrical energy to thermal energy?

a)

Buzzer

b)

Resistor

c)

Lightbulb

d)

LED

55.

Which component controls the direction that electricity flows in a circuit?

a)

Diode

b)

Motor

c)

Buzzer

d)

LED

56.

What is the job of a diode in reverse diode?

a)

Allow electricity to flow through

b)

Stop electricity to flow through

c)

Produce light

d)

Produce sound

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