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WorksheetsEnergy Wrap Up
Total questions: 20
Worksheet time: 10mins
A pair of tweezers is
a first class lever
a compound machine made of two third-class levers
an inclined plane
a kind of wedge
A ramp is a _______ that decreases the force required to move an object while increasing the distance the object travels.
force
newton
load
machine
Mechanical Energy is equal to which two combined energies?
kinetic and potential
potential and non-mechaical
kinetic and non-mechanical
none of the above
As a dropped penny falls toward the ground, _______ energy is converted to _______ energy.
thermal, potential
kinetic, vibrational
kinetic, heat
potential, kinetic
A pendulum will not return to its original position because
potential energy is inefficient
the mechanical energy is stored for later
some of the mechanical energy is converted to thermal energy due to friction
energy is not conserved
Energy of position is called ________ Energy.
kinetic
potential
nuclear
chemical
Energy stored in chemical bonds, such as food, is known as _______ Energy
chemical
potential
gravitational
sound
Friction cases mechanical energy to be converted into which form?
thermal
nuclear
kinetic
potential
Which sequence describes the energy conversions in a car's engine?
chemical to thermal to mechanical
mechanical to thermal to chemical
thermal to mechanical to chemical
kinetic to potential to mechanical
The kinetic energy from an object's motion always changes when which factor changes?
the object's chemical potential energy
the object's volume
the object's direction of motion
the object's speed
The energy due to compressing a spring is
chemical potential energy
elastic potential energy
gravitational potential energy
kinetic energy
This law states that the universe's total amount of energy does not change
Law of Gravity
Newton's First Law
Law of Conservation of Energy
Law of Conservation of Mass
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
Thermal → solar → electrical
Mechanical → sound → light
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 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.
The amount of energy used by the electric pencil sharpener is greater than an electric lamp.
In which of the following scenarios would this energy transformation be observed?
chemical → light → heat
Plucking a guitar string
Turning on a fan
Lighting a match
Starting a car
During energy transformations, energy is never ___.
released as heat
created or destroyed
used to increase an object's potential energy
completely transformed
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 leaves the bat
when it reaches its highest point
when the mechanical and kinetic energies of the baseball are equal
Which energy transformation occurs in a toaster?
electrical → thermal
nuclear → electrical
chemical → thermal
thermal → electrical
A battery converts what type of energy to another?
electrical → thermal
kinetic → nuclear
chemical → electrical
light → heat
Which items would have this energy transformation: chemical → mechanical
a candle burning
a ball bouncing
eating a big breakfast before a race
using a hairdryer
