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WorksheetsSemester 1 Review
Total questions: 45
Worksheet time: 45mins
A lamp that plugs into a wall socket draws energy, which flows through a thin wire in the bulb, causing it to heat up until it glows. What energy transformations are taking place?
Chemical → light → electrical
Mechanical → sound → light
Thermal → solar → electrical
Electrical → thermal → light
An electric pencil sharpener uses electricity to make its motor spin. The pencil sharpener also makes noise and heats up. Which observation of the pencil sharpener demonstrates the law of conservation of energy?
The amount of electrical energy used equals the total amount of mechanical, sound, and thermal energy produced.
The amount of energy used by the electric pencil sharpener is greater than an electric lamp.
The electric pencil sharpener only uses energy when it is being used to sharpen a pencil.
The electric pencil sharpener is easier to use than the older version that was cranked by hand.
Turning the handle makes a current that causes the light bulb to glow. What are the energy transformations that happen in this hand generator?
Thermal → solar → light
Mechanical → electrical → light
Electrical → mechanical → light
Solar → light → electrical
A baseball is hit into the air with a bat. When does baseball have the greatest gravitational potential energy?
when it hits the ground
when it reaches its highest point
when it leaves the bat
when the mechanical and kinetic energies of the baseball are equal
Which energy transformation occurs in a toaster?
electrical → thermal
chemical → thermal
nuclear → electrical
thermal → electrical
The lower a material's specific heat, the more its temperature rises when a given amount of energy is absorbed by a given mass.
True
False
Ice cubes are placed in a glass of water that is at room temperature. Which statement best describes the temperature of the water after 10 minutes?
The temperature decreases because some of the water's heat is lost to the ice.
The temperature decreases because some of the ice's heat is lost to the water.
The temperature increases because some of the coolness of the water is absorbed by the ice.
The temperature increases because some of the coolness of the ice is absorbed by the water.
The type of waves that require medium to pass:
Mechanical Waves
Electromagnetic Waves
Transverse Wave
Longitudinal Wave
The speed of sound depends on these two things:
The type of medium and the temperature of the medium
Speed of the medium and temperature of the medium
Temperature of the medium and sound of the medium
None of the above
Sonar and echolocation use ----- to detect objects under water.
Refraction
Reflection
Two light waves have the same wavelength. The wave with the greater amplitude carries _______ energy.
less
more
same amount
Two light waves have the same amplitude. The wave with the higher frequency carries ______ energy.
less
more
the same amount of
Which type of wave on the Electromagnetic Spectrum has the highest frequency?
radio waves
infrared waves
UV rays
gamma rays
What are the components of the electromagnets?
battery, wire and bulb
battery , copper wire and paper clips
battery, copper wire and iron nail
battery, wire and aluminum
A bulb draws 0.5 amperes from a 120-volt supply. What is the resistance of the bulb?
200 Ω
240 Ω
250 Ω
300 Ω
When will the forces of gravity between two objects be the GREATEST?
when the masses of both objects are small and the objects are far apart
when the masses of both objects are large and the objects are close together
when the masses of both objects are small and the objects are close together
when the masses of both objects are large and the objects are far apart
It changes the direction of the input force.
It changes the distance over which the input force is applied.
It changes the amount of the input force applied
It changes direction and increases the effect of your input force
What is effort (input) force?
the force one exerts on a machine
the force which an effort force must overcome in order to do work on an object via a simple machine.
the force the machine exerts on a object
the output work times the input distance
Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever (MA=Output Force/Input Force)?
1
10
100
1000
