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DE_Phys_Unit3

Last updated over 2 years ago
40 questions
Note from the author:
This Formative will cover Unit 3.2-3.5
This Formative will cover Unit 3.2-3.5
DE_Phys_3.2_Conservation of Energy
1
Energy is defined as the ability to do _______ .
1

What element is the video referring to?

1

Why can't we 'harvest' (that is to say, why can't we get) hydrogen from the atmosphere (air)?

1

Instead of getting hydrogen from air, we can get it from water by splitting hydrogen from oxygen...but there's one problem...what is that problem?

1

What is the solution the speaker is suggesting for producing hydrogen with the least amount of energy?

4
Energy __________ be made from nothing. We have to convert it from other forms to make electricity. Many power plants rely on fossil fuels which are a __________source of energy. The energy in fossil fuels such as oil and coal is a form of __________energy. Once we run out of fossil fuels, we will have to rely on alternative energy sources, such as wind and solar which __________sustainable.
1
According to the video, the type of energy possesed by an object or a system due to the constant movement of particles within the object or the system is a type of kinetic energy called _______ .
Watch the video in Discovery Education, under the Engage tab.
5
Most of the energy on Earth originally came from the _______ . Due to _______ reactions taking place inside the sun, energy in the form of _______ is released. Upon entering our atmosphere, this energy is converted into _______ energy. Earth does have its own source of energy as well due to _______ decay deep inside the core, which is released at volcanoes and hot springs.
1
According to this picture, the bowling ball is __________energy and the pins are __________energy.
1

What does the law of conservation of energy state?

1

Stored energy is also known what kind of energy?

1

Energy of motion is also referred to as what type of energy?

1

Which formula describes each type of energy

Draggable itemCorresponding Item
PE (potential energy)
=mgh
KE (kinetic energy)
=1/2(m)(v)2
3
For the equation PE=mgh, the m represents _______ , g represents _______ , and h represents _______
1
For the equation KE=1/2(m)(v)2, the m represents _______ and the v represents _______ .
2

A tennis player strikes a tennis ball from underneath with her racket. The ball is sent straight up with an initial velocity of 19 m/s. How high above the striking point will the ball travel? Include units.

2

A photographer sitting near the open door of a news helicopter accidentally drops his 140-g mobile phone out the door at an altitude of 990m. How fast will the phone be falling when it strikes the ground? Include units.

1

Match the following equations to the correct type of energy they must calculate

Draggable itemCorresponding Item
Change in Gravitational Potential Energy
Elastic Potential Energy
Electric Potential Energy
1

A boy with mass 25 kg climbs into a small tree. He sits on a branch that is 2.0 meters above the ground. What is his gravitational potential energy with respect to the ground?

1

A cat with mass 4.0 kg jumps down to the floor from a bookcase 2.0 m high. What is the cat's change in gravitational potential energy? Include Units

1

To store stacks of clean plates, a cafeteria uses a closed cart with a spring-loaded shelf inside. Customers can take plates off the stack one at a time through a hole in the top. A stack of plates compresses the spring 0.40 m. The spring constant is 240 N/m. What is the elastic potential energy of the spring? Include units.

1

Customers take plates from the same cart as question 21. As a result, the spring moves up to be compressed by only 0.30 m. What is the change in elastic potential energy. Include units.

1
For Electric Potential Energy, two particles with the same charge (both positive or both negative) will move _______ each other. Two particles of different charge (one negative, one positive) will move _______ from each other.
1

A fixed source charge particle of 4.1 nC and a second particle with charge 2.4 nC are separated by a distance of 3.5 cm. What is the electric potential energy between the particles? And if the second particle is released, will it move toward or away from the source charge? Include units.

1

A toy cannon launches a 46-g golf ball straight up into the air with a kinetic energy of 6.8 J. What must be the ball's velocity be as it leaves the cannon? Include units.

1

A hockey player shoots a puck across the ice with kinetic energy 63 J and velocity 28 m/s. What is the mass of the puck in grams? Include units.

1
To demonstrate the law of conservation of energy, measure the gravitational _______ and the _______ at all points on an object’s trajectory, and show that the _______ of the two is constant.
DE_Phys_3.3_Law of Thermodynamics
1
Thermodynamics describes limits on energy exchange as _______ and _______.
2
_________ is the transfer of thermal energy from one object to another. ___________________ is transferred any time a lower-temperature object is brought into contact with a higher-temperature object. Thermal energy flows from _______________________ objects to ______________________ objects. Eventually, heat will transfer enough energy that the two objects will reach a state of ________________________ .
Other Answer Choices:
higher-temperature
heat
thermal equilibrium
thermal energy
lower-temperature
1

Match the type of system with the correct description.

Draggable itemCorresponding Item
Open System
Mass cannot enter or leave the system, but energy is free to enter or leave the system
Isolated System
Both mas and energy can enter or leave the system.
Closed System
Neither energy nor mass can enter or leave the system.
6
In the context of thermodynamics, internal energy of an object is the sum of all the _______ and _______ energies of each molecule in the object. In the simple case of a monatomic gas ,that is to say a molecule consisting of only one atom, the motion of the molecule accounts for the_______ energy of the gas and the gravitational position of the molecules accounts for the _______ energy of the molecule. In the case of liquids and solids, internal energy depends more on the _______ energy stored in the_______ between atoms and molecules.
7
The law of thermodynamics stating that if object A=B (in thermal equilibrium) and A=C (in thermal equilibrium), then B=C too, must be in thermal equilibrium is known as the __________. The __________states that in any natural process, the total entropy of a system and its surrounding environment must increase. The __________is another way of stating the principle of conservation of energy (that energy is neither created nor destroyed) and is expressed in equation form as the change in internal energy of a system __________ is equal to the thermal energy added by heat to the system __________plus the word done on the system__________. The __________states that at absolute zero, all processes stop and entropy reaches a minimal value.
1

A reversible process is one that can be done in reverse without changing the total energy of the system, which in reality, does not exist due to what factors?

DE_Phys_3.4_Electricity and Magnetism
8

Match key vocabulary with their definitions (use the glossary in DE to assist if necessary)

Draggable itemCorresponding Item
voltage
a current flows through a substance when light hits its surface; also known as the Hertz effect
electric field
a set of lines that defines the motion of charged particles near each other
magnetic field
a wave that can transport its energy through a vacuum i.e. space
electromagnetic wave
a set of forces due to stationary or moving electric charges
photoelectric effect
the number of waves that pass a given point during a specified period of time
induction
a distribution of electrons within a conductor caused by a varying magnetic field
electromagnetism
a set of lines that defines the motion of charged particles near a magnet
frequency
a measure of the electrical potential difference between two points
1
The photoelectric effect as explained by Einstein requires us to think about light as distinct energy packets, called _______ , not as waves.
DE_Phys_3.5_Conductors and Insulators
3
Every charged particle is surrounded by a(n) __________field. One big difference between electrical forces and gravitational forces act only to __________two bodies, whereas electrical force can be __________.
2
Magnetic forces affect magnetic objects. Magnetic fields arise either from permanent magnets or from the flow of _______ in a current. Any moving charge creates a _______ field.
3
An electric field is present with one or more _______ charges, but an electric field can be produced by a magnetic field that is in _______ . This can be observed when a magnetic field changes its strength or _______ with respect to a wire coil such as moving a magnet inside a copper coil.
1
The mutual interaction between electric and magnetic fields is known as _______ .
1

What type of wave are electromagnetic waves?