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Physics > P8.1 > Flashcards

P8.1 Flashcards

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1
Q

What does accurate mean?

A

How close the value are to the true values

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2
Q

What does precise mean?

A

How close values are to each other

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3
Q

How many metre in a mile?

A

1609

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4
Q

How would you measure the speed of a car?

A

Speed camera or speed gun

Use a trundle wheel to measure the distance between marks on a road and use the time between 2 photos to work out distance and time

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5
Q

How would you measure the speed of a runner?

A

Measure the distance of the race track and use pressure pads for time

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6
Q

How would you measure the speed of a cyclist?

A

Wheel circumference for distance and magnetic sensors to detect each rotation

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7
Q

How fast does a person walk or run?

A

1m/s and 5m/s

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8
Q

How fast is an Olympic cyclis?

A

20m/s

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9
Q

How can you measure reaction time?

A

Catching a falling ruler

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10
Q

What is thinking distance?

A

The distance travelled by a vehicle in the time it takes for a driver to see an event and apply a force to the brakes. It is directly proportional to speed

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11
Q

What is typical human reaction speed?

A

0.2-0.8 seconds

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12
Q

What factors effect thinking distance?

A 
Blood alcohol levels
Tiredness
Drugs both legal and illegal
Distraction
Using a radio or phone
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13
Q

How do you calculate thinking distance of a car travelling at 50mph?

A

Convert to m/s - 50x1609/3600

Distance= speed x time - Assume that time is 0.2 seconds

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14
Q

What is braking distance?

A

The distance a vehicle travels while a force is applied to the brakes

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15
Q

What factors affect braking distance?

A

Road conditions
Speed
Quality of brakes and tires

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16
Q

What is stopping distance?

A

The total distance that a car travels from the moment the driver sees an event

Thinking distance + braking distance

17
Q

What is the Highway Code acceleration?

A

-6.6m/s

18
Q

Why are large decelerations dangerous?

A

The force exerted by the seat belt can cause compression injuries and injure organs

19
Q

Why do Seatbelts stretch ?

A

To increase the time taken to come to a halt which decreases the force. They must be replaces after an accident

20
Q

What are crumple zones and air bags for?

A

To increase the time taken for the car to come to a halt and the driver to hit the steering wheel. Force is inversely proportional to time so the more time the less force

Physics (7 decks)

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