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Physics > P2.1 > Flashcards

P2.1 Flashcards

1
Q

What is a light gate?

A

A light gate is a timer that starts and stops when an abject interrupts a light beam

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2
Q

What is a light gate used for (give an example)?

A

To measure short periods of time
Measure the time of a falling object

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3
Q

What is ultrasound?

A

A high frequency sound wave

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4
Q

How does ultrasound work?

A

The device measures the time taken for a pulse to travel somewhere and back and it uses this data to work out the distance

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5
Q

What is the formula for average speed?

A

Total distance (M)
—————————-
Time (S)

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6
Q

How many metres are in a mile?

A

1609

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7
Q

How would you convert mph to m/s?

A

1609(m)
X ————————
3600(s)

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8
Q

What is a vector?

A

A quantity with a magnitude and a direction

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9
Q

How do you represent a vector?

A

With an arrow

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10
Q

What is scalar?

A

Something that has a magnitude but no direction

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11
Q

What is the difference between speed and velocity?

A

Speed only has a magnitude (scalar) and velocity has a magnitude and direction (vector)

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12
Q

What is acceleration?

A

The change in velocity per second

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13
Q

What is the formula for acceleration if you know change in velocity?

A

Change in velocity (m/s)
————————————
Time (s)

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14
Q

What are the units for acceleration?

A

M/S^2

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15
Q

What does the gradient mean in a distance time graph?

A

The speed

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16
Q

How is a distance time graph different to a displacement time graph?

A

A displacement time graph has a direction and magnitude and the gradient can be positive, 0 or negative

17
Q

How do you calculate distance in a velocity time graph?

A

Multiply speed and time (use triangles and rectangles)

18
Q

What is the formula for the equation of motion?

A

v^2 - u^2 = 2as

19
Q

What is the formula for kinetic energy?

A

1/2 mv^2

Physics (9 decks)

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