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Science revision ks3 > Physics > Flashcards

Physics Flashcards

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1
Q

What is an asteroid?

A

Asteroids are small, rocky objects that orbit the Sun. Although asteroids orbit the Sun like planets, they are much smaller than planets.

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2
Q

What is specular reflection?

A

Specular reflection is a type of surface reflectance often described as a mirror-like reflection of light from the surface. In specular reflection, the incident light is reflected into a single outgoing direction.

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3
Q

What is diffuse reflection?

A

Diffuse reflection is the reflection of light from a surface such that an incident ray is reflected at many angles, rather than at just one angle as in the case of specular reflection. Normally on a non-flat surface.

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4
Q

What is the difference between transparent, translucent, luminous and opaque

A

Transparent allows all light to pass through. Translucent allows some light to pass through. Opaque doesn’t allow light to travel through. Luminous gives off light / bright.

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5
Q

What is a natural satellite?

A

A satellite is anything that orbits around a larger object.

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6
Q

What is a meteorite?

A

A meteorite is rock that falls from space to Earth.

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7
Q

What is a star?

A

A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements.

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8
Q

What is a planet?

A

A planet is a celestial body that is in orbit around the Sun?

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9
Q

What are 3 contact forces?

A

Air resistance, Friction, Tension

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10
Q

What are 3 non- contact forces?

A

Gravitational force, Magnetic force, Electrostatic

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11
Q

How do you calculate the voltage?

A

Voltage = current x resistance

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12
Q

Explain what happens when light hits a prism

A

As light passes through a prism, it is bent, or refracted, by the angles and plane faces of the prism and each wavelength of light is refracted by a slightly different amount. Violet has the highest frequency and is refracted the most. Red has the lowest frequency and is refracted the least.

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13
Q

Why are non- renewable energy sometimes?

A

Non-renewable energy is cheaper.

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14
Q

How do you calculate the efficiency

A

efficiency = useful energy transferred / total energy supplied x 100%

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15
Q

What is a current?

A

A flow of electrons

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16
Q

The current increases when the _____ increases

A

Voltage

17
Q

What is meant by frequency, amplitude and wavelength?

A

Amplitude is the distance between the resting position and the maximum displacement of the wave. Frequency is the number of waves passing by a specific point per second. Wavelength is the distance from one crest or trough to another.

18
Q

How does conduction, convection and radiation all transfer energy?

A

While conduction is the transfer of heat energy by direct contact, convection is the movement of heat by actual motion of matter; radiation is the transfer of energy with the help of electromagnetic waves.

19
Q

How do you calculate speed

A

Speed = distance / time

20
Q

How do you calculate work done?

A

Work done (J) = force (N) x distance moved in the direction of force (m)

21
Q

Diesel fuel is a store of what type of energy?

A

Chemical energy store

22
Q

What are examples of things that store energy in chemicals?

A

Batteries, Biomass, Petroleum, Coal, Natural gas

23
Q

How do you calculate the moment?

A

Moment = force x perpendicular distance from the pivot

24
Q

What are the 7 stores of energy?

A

Kinetic, Gravitational potential, Chemical, Elastic potential, Magnetic, Electrostatic and thermal energy

25
Q

What are ways energy can be transferred?

A

Mechanically, Heating, Electrically and light and sound

26
Q

What is the equation for energy transferred

A

Energy transferred = force x distance

27
Q

If in relative speed objects are traveling the same way you minus but if they are heading for each other you ….

A

Add

28
Q

How fast does light from the sun get to Earth?

A

8.3 minutes

29
Q

What wave does sound travel in

A

Longditudinal

30
Q

True / False

The charge in a circuit is negative

A

True

Science revision ks3 (3 decks)

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