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Physics 🧲 > Motion And Forces > Flashcards

Motion And Forces Flashcards

1
Q

What is the equation for momentum?

A

Momentum = Mass x Velocity
p = m x v

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2
Q

What is the equation for force?

A

Force = Change in momentum / Time taken for change
F = mv - mu / t

Or

F = m (v - u) / t

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3
Q

What is Newton’s third law?

A

For every action there is an equal and opposite reaction

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4
Q

What factors can after drivers reaction times?

A
  • Tiredness
  • Alcohol and drug use
  • Distractions
  • Age
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5
Q

What is human reaction time?

A

The time between a stimulus occurring and a response

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6
Q

What factors affect the braking distance?

A
  • Icy or wet road
  • Worn brakes or tires
  • Mass of the car
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7
Q

What does the slope of a velocity/time graph tell you?

A

Acceleration

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8
Q

What does the area under a velocity/time graph tell you?

A

Distance travelled

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9
Q

What is the typical speed of walking?

A

1.5 m/s

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10
Q

What is the typical speed of running?

A

3 m/s

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11
Q

What is the typical speed of cycling?

A

6 m/s

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12
Q

What is the typical speed of driving?

A

13-30 m/s

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13
Q

What is the typical speed of sound in air?

A

330 m/s

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14
Q



A
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15
Q

What is Newton’s first law?

A

A body will remain at rest or continue in a straight line at a constant speed as long as the force acting on it are balanced

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16
Q

What is newton second law?

A

Resultant force = mass x acceleration

17
Q

What is acceleration in freefall?

A

10 m/s^2

18
Q

What is inertial mass?

A

A measure of how difficult it is to change the velocity of an object

19
Q

How do you define inertial mass?

A

The ratio of force over acceleration

20
Q

How can you measure human reaction time?

A
  • Ruler drop test
  • Metre ruler is held vertically, level with a persons finger and thumb
  • The ruler is dropped and grasped by person
  • They record the length they caught it at

Physics 🧲 (15 decks)

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