Physics Explanations

Question 1

Explain

Distance

in terms of speed and time

Answer 1

travelling a distance in a certain amount of time causes a speed to be created

Distance = Speed * Time

Question 2

Explain

Speed

in terms of distance and time

Answer 2

travelling a distance in a certain amount of time causes a speed to be created

Speed = Distance / TIme

Question 3

Explain

Time

in terms of speed and distance

Answer 3

travelling a distance in a certain amount of time causes a speed to be created

Time = Distance / Speed

Question 4

Apply the law of conservation of energy to the total energy of energy transfers

Answer 4

In an energy transfer, the total amount of energy must remain the same, because more energy connot be created and none can be lost or destroyed.

Question 5

Explain

Apply the law of conservation of energy to the total energy of energy transfers

Answer 5

• In order to create a new type of energy, other energy must be used
• the total energy remains the same.
• This is because the law of conservation of energy shows that no energy can be created or destroyed

Question 6

Explain

Convection

in terms of the particle model

Answer 6

Convection is caused by the movement of particles in a fluid.
Particles are heated by a heat source -> they are less dense -> they move above other particles and away from heat source -> more dense particles come near the source and are heated. This means that the entire fluid gets heated.

Question 7

Explain

Conduction

in terms of the particle model

Answer 7

Conduction is caused by particles transfering heat to eachother through vibrations, in a solid.
A heat source heats some particles -> they begin to vibrate from the heat energy -> their movement knocks into other particles, transfereing the energy
The heat energy is passed through every particle so the solid gets heated.

Question 8

Explain

Radiation

Answer 8

Radiation is a transfer of energy caused by releasing waves of energy that are electromagnetic, and so are able to travel without a medium to pass through. The waves then interact with objects that can absorb them, causing the energy to get transfered to that object.

Question 9

Describe

Absorbtion

Answer 9

Absorbtion is where an object transforms the energy of a wave. This means that the wave no longer has the energy and is reduced in intensity. Objects can absorb different wavelengths, and some but not all.

Question 10

Describe

Reflection

Answer 10

Reflection occurs when a wave is not absorbed or allowed to pass through a surface. It is bounced back away from the surface.

The ∠ of incidence is always = to the ∠ of reflection from the normal

Question 11

Describe

Refraction

Answer 11

Refraction occurs when a light wave passes through a new medium. In a more dense medium the wave will be bent towards the normal

Different wavelengths are bent different amounts.