Font size
WorksheetsScience Final Prep- D,E
Total questions: 44
Worksheet time: 3hrs 4mins
What combination of simple machines are in a screwdriver?
Wheel and axle
Screw
Wedge
Pulley
Inclined plane
Calculate the mechanical advantage of a machine with an input force of 52 N, and an output force of 26 N.
(a)
Calculate the mechanical advantage of this machine.
Input force: 24 N
Output force: 100 N
Input distance: 56 cm
Output distance: 0.7 cm
(a)
A man is pulling a sack 0.5 m with a force 20 N. How much work is he doing?
40 J
10 J
10 N-m
0.025 N-m
10
Calculate the speed ratio of this machine.
Input force: 24 N
Output force: 100 N
Input distance: 56 cm
Output distance: 0.7 cm
(a)
Calculate the speed ratio of this machine.
Input force: 36 N
Output force: 74 N
Input distance: 90 cm
Output distance: 0.8 cm
(a)
Calculate the efficiency of this machine.
Input force: 36 N
Output force: 74 N
Input distance: 90 cm
Output distance: 0.8 cm
(a)
Calculate the efficiency of this machine.
Input force: 5 N
Output force: 25 N
Input distance: 23.6 cm
Output distance: 0.7 cm
(a)
What is the formula for mechanical advantage?
OF= Output force
IF= Input force
OD= Output distance
ID= Input distance
IFOF
OFIF
IDOD
ODID
IFOFx 100
What is the formula for work?
F= Force
P= Pressure
A= Area
D= Distance
F=AP
dF
F x d
F=PA
What is the formula for speed ratio?
OF= Output force
IF= Input force
OD= Output distance
ID= Input distance
IFOF
ODID
IDOD
OFIF
ODIDx 100
What is the formula for efficiency?
MA= Mechanical advantage
SR= Speed ratio
MASR
SRMA
MASRx 100
SRMAx 100
A first class lever has....
The
fulcrum (triangle in image) between the load and the point where the effort is exerted
to move the load.
The load between the
effort (hand in image) and the fulcrum (triangle in image)
The effort (hand in image) between the load and the fulcrum (triangle in image)
A second class lever has....
The
fulcrum (triangle in image) between the load and the point where the effort is exerted
to move the load.
The load between the
effort (hand in image) and the fulcrum (triangle in image)
The effort (hand in image) between the load and the fulcrum (triangle in image)
Em is using a lever. The fulcrum is between the load and the force her hand exerts. What kind of lever is she using?
1st class
2nd class
3rd class
Em is using a lever. The load is between the effort (her hand pulling it) and the fulcrum. What kind of lever is she using?
1st class
2nd class
3rd class
Em is using a lever. The effort (her hand pulling it) is between the load and the fulcrum. What kind of lever is she using?
1st class
2nd class
3rd class
Calculate the work output.
Input force: 5 N
Input distance: 4.38 cm
Output force: 8 N
Output distance: 5.5 cm
21.9 J
44 N-cm
44 J
21.9 N-cm
Calculate the work output. Choose the best answer.
Input force: 7 N
Input distance: 5.38 m
Output force: 12 N
Output distance: 4.5 m
37.66 J
54 J
54 N-m
37.66 N-m
In a gear system, the driving gear's circumference is 74 m. It turns with a force of 5 N. The driven gear's circumference is 5 cm, and it turns with a force of 10 N. What is the efficiency of this system? Don't forget the percent symbol!
A driving gear is the gear that has an outside force applied to it. A driven gear is the gear the driving gear moves.
(a)
What does hydraulic mean?
A system that uses solids to move things
A system that uses compressed air to move things
A system that uses liquids to lift or move things
What does pneumatic mean?
A system that uses solids to move things
A system that uses compressed air to move things
A system that uses liquids to lift or move things
What is the definition of pressure?
Pressure is the amount of force applied to a given area.
Pressure is the amount of force applied to any area.
Pressure is measured in pascals.
Pressure is measured in pascals. A pascal equals the force of 1 ______ over an ______ of 1 m2.
Newton, area
Area, newton
Newton, octogan
How do you calculate pressure?
Force divided by area
Area divided by force
Area divided by pressure
Pressure divided by force
Calculate the pressure. Remember the unit is P (pascals).
Force= 36 N
Area= 9 cm2
(a)
What is salinity?
The total amount of all salts dissolved in water
The total amount of sea salt dissolved in water
The maximum amount of salt able to dissolve in a given volume of water
Saltiness
All water on Earth is fresh water or (a) water.
Thermal pollution is....
A pollution that releases heat into the air, damaging the climate
A pollution that changes the temperature of a habitat
A pollution that releases toxins into a body of water
A pollution that changes the temperature of a body of water
Factories that release their clean water into rivers can still kill plants and animals. This is because....
The water lacks the natural chemicals of that certain habitat
The water is cleaned with harmful chemicals
The water contains microorganisms
The new water changes the temperature of the water habitat
Tide is the daily ____ of water _____ in oceans.
Change, level
Growing, temperature
Increase, flow
Change, swells
The main cause of tides is....
Climate
Weather
The gravitational force of the moon
The gravitational force of the sun
The side of Earth that is closest to the moon feels the strongest pull from the moon’s gravity. This is where the bulge of water is the ________. But other forces are also at work, resulting from Earth’s and moon’s rotations. These forces cause another, _______ bulge on the other side of Earth at the same time. The two bulges, on either side of Earth, are the high tides.
Largest, almost equal
Smallest, larger
Largest, smaller
When a river enters a lake or ocean, it slows down, dropping much of the sediment it carries. The sediment forms a fan-shaped deposit called a _______.
Shoal
Sandbank
Delta
Sandbar
Distillation is a technique for separating solutions that involves _______ and _________.
Straining
Boiling
Condensation
Sublimation
Freezing
The order of the water cycle is....
Runoff and groundwater, evaporation, precipitation, condensation
Condensation, evaporation, percipitation, runoff and groundwater
Evaporation, condensation, precipitation, runoff and groundwater
Evaporation,
percipitation, condensation, runoff and groundwater
What do you call a change in the state of matter from liquid to gas?
Condensation
Evaporation
Sublimation
What is climate?
Average weather measured over a long period of time
The weather measured at a specific time
Water can hold onto heat _____ than other substances do. It takes a _______ time to raise or lower the temperature of a large body of water. The main effect that this has on a climate is ___________.
Longer, long, it prevents extremes in temperature
Shorter, short, causing extreme fluctuations in temperature
Longer, long, causing shorter winters
Longer, long, causing shorter summers
Animals and plants that live along the shoreline of the ocean have to be able to withstand the _________ of the waves. They also have to be able to live out of the water for some time every day at ____ tide. This shoreline area they live in is called the ________.
Temperature, high, sunlight zone
Pounding, low, intertidal zone
Pounding, low, tideland
Dragging, low, tidal zone
What is a population?
A group of organisms of the same species that live in any area
A group of people living in the same place
A group of organisms of the same species that live in a particular area
A group of organisms that live in a particular area
What is a watershed?
An area of land that drains into one main river
An area of land that drains into the ocean
An area of water that drains into one main lake or river
An area of land that drains into one main lake or river
Potable water is....
Water that humans can't drink safely
Water that humans can drink safely
Water that is bottled for later use
Water than has been boiled to get rid of bacteria
What are facts about Phytoplankton?
Animals in the upper part of the ocean feed on them.
They are microscopic plants
They are food for the fish in the middle zone, where light still penetrates.
They are tiny, floating sea animals
They are tiny, yet visible, plants.
