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GCSE Science Revision > Physics > Flashcards

Physics Flashcards

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1
Q

What happens to pressure in a liquid as its depth increases?

A

The pressure increases as well

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2
Q

What is Thinking Distance?

A

The distance a vehicle travels in the time it takes for the driver to apply the brakes after realising they need to stop.

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3
Q

What is the relationship between greater mass of a moving object and its ability to stop quickly?

A

Greater mass means there is more kinetic energy for the brakes to transfer.

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4
Q

How might the shape of an object change if forces act away from each other in a straight line?

A

It may extend

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5
Q

How might the shape of an object change if forces act towards each other in a straight line?

A

It may compress

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6
Q

What is the formula for calculating weight?

A

W = mass x gravitational field strength

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7
Q

What is Terminal Velocity?

A

The constant speed of an object achieved by falling freely through a gas or liquid.

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8
Q

What is the formula for when an object is accelerating at a constant acceleration?

A

v² - u² = 2a(s or x)

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9
Q

What is the general formula for acceleration?

A

v - u / t

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10
Q

What is acceleration?

A

A change in velocity

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11
Q

What is velocity?

A

The speed of an object of over a select given time (usually 1s) in a specific direction.

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12
Q

What is the formula for Velocity?

A

change in displacement / change in time

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13
Q

What is the difference between distance and displacement?

A

Distance is a SCALAR quantity that refers to “HOW MUCH GROUND an object has covered” during its motion.

Displacement is a VECTOR quantity that refers to “HOW FAR OUT OF PLACE an object is”; it is the object’s overall change in position.

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14
Q

What does a Horizontal line show in a velocity/time graph?

A

It shows constant velocity over time (no acceleration).

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15
Q

How can I work out the acceleration of an object in a velocity time graph?

A

By working out the gradient of the line.

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16
Q

What is the difference between a Vector and Scalar Quantity?

A

Scalar quantities only show magnitude or size and NOT direction, however, Vector quantities show magnitude AND direction.

17
Q

Provide at least 4 examples of Vector Quantities

A
  • Displacement
  • Weight
  • Acceleration
  • Velocity
  • Momentum
  • Friction
  • Forces
18
Q

Provide at least 4 examples of Scalar Quantities

A
  • Distance
  • Speed
  • Mass
  • Temperature
  • Energy
  • Density
  • Time
19
Q

What is the formula for calculating efficiency in energy?

A

useful energy output / total energy output

key info: the answer will always be less than 1

20
Q

What is the formula for calculating total Gravitational Potential Energy (GPE)?

A

△GPE = m x g x △h

a change in gravitational potential energy = mass x gravitational field strength x a change in height

21
Q

Why is metal a good conductor of heat?

A

Metals have free electrons. These free electrons move “freely” and pass on the heat energy faster than substances that don’t have free electrons.

22
Q

How does Radiation work?

A

Radiation is a method of heat transfer that can pass through anything including a vacuum (an area with no particles). It travels through infrared waves on the electromagnetic spectrum.

23
Q

How does conduction work?

A

Particles in a solid vibrate on the spot with heat energy and pass the heat energy through collision.

24
Q

How does convection work?

A

Convection works in a liquid or gas through areas of a liquid or gas heating or cooling greater than their surroundings, causing differences in temperature. These temperature differences then cause the areas to move as the hotter, less dense areas rise, and the cooler, more dense areas sink.

25
Q

In a convection current, do dense hotter areas rise or sink?

A

They rise.

26
Q

In a convection current, do less dense colder areas rise or sink?

A

They sink.

27
Q

What is average human reaction time?

A

0.2-0.9 seconds

28
Q

What is the formula for momentum?

A

mass x velocity = momentum

GCSE Science Revision (6 decks)

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