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Physics > Motion and forces > Flashcards

Motion and forces Flashcards

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1
Q

What is a scalar?

A

It a magnitude (size) but no specific direction

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2
Q

What is is a vector?

A

It has both magnitude (size) and specific direction

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3
Q

What does velocity mean?

A

Speed in a stated direction

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4
Q

What is the equation for speed, distance and time

A

Speed=distance/time

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5
Q

How do you work out the distance traveled?

A

Distance travelled =average speed x time

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6
Q

How do you calculate acceleration?

A

a=(v-u)/t

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7
Q

What are the the range of laboratory methods for determining speeds of objects as the use of light gates?

A

using a high speed pulsed laser, a beam splitter, mirrors and fast detectors and oscilloscope

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8
Q

What is the typical speed for wind?

A

about 12 m/s

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9
Q

What is the typical speeds for sound?

A

331.29 m/s

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10
Q

What is the typical speed for walking?

A

Between 1.2 and 1.4 m/s

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11
Q

What is the typical speed for running?

A

Between 4 and 6 mph

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12
Q

What is the typical speed for cycling?

A

15.9 mph

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13
Q

What is the typical speed for car?

A

13-30 m/s

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14
Q

What is the typical speed for a train?

A

56 m/s

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15
Q

What is the typical speed for plane?

A

250 m/s

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16
Q

What is acceleration in free fall?

A

10 m/s*2

17
Q

What is Newton’s first law

A

an object remains in the same state of motion unless a resultant force acts on it

18
Q

What is Newton’s second law?

A

a force to be equal to change in momentum (mass times velocity) per change in time.

19
Q

What is the calculation needed for Newton’s second law?

A

F = m x a

20
Q

What is the calculation needed for weight?

A

W =m x g

21
Q

How is weight measured?

A

a measure ofthe force of gravity on a physical object and is measured in newtons.

22
Q

What is the relationship between the weight of a body and the weight of the gravitational field strength?

A

directly proportional

23
Q

What is Newton’s third law?

A

whenever two objects interact, they exert equal and opposite forces on each other.

24
Q

What is the equation for momentum?

A

p = m x v

25
Q

What is human reaction times and recall typical results?

A

0.2 seconds

26
Q

What is stopping distance of a vehicle is made up of the sum of the thinking distance and the braking distance?

A

Stopping distance = Thinking distances +breaking distance

27
Q

Give three examples of things that can effect the stopping distance?

A

The mass of the car
The speed of the vehicle
The driver’s reaction time

28
Q

What are the effects of a driver’s reaction time when they are drunk or have used drugs?

A

ability to judge speed and distance. reaction and coordination skills. blurry or impaired vision.

Physics (3 decks)

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