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Physics P2 > P2.2 Forces > Flashcards

P2.2 Forces Flashcards

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1
Q

Name some forces [8]

A
  • Resistance
  • Push
  • Pull
  • Friction
  • Weight
  • Thrust
  • Reaction force
  • Up thrust
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2
Q

What are forces measured in?

A

Newtons (N)

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3
Q

What does the resultant force do?

A

Gets an object moving

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4
Q

What happens to the forces when there is a constant speed?

A

They are balanced

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5
Q

What is the resultant force when there is a steady speed?

A

Zero

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6
Q

What does it mean when the resultant force doesn’t equal zero?

A

The object is accelerating or decelerating

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7
Q

What is another equation for acceleration?

A

Acceleration = force/mass

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8
Q

What is the equation for resultant force?

A

Resultant force = forward force (thrust) - friction (drag)

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9
Q

What is the equation for working out stopping distance?

A

Stopping distance = thinking distance + braking distance

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10
Q

What things can affect thinking distance? [4]

A
  • Tiredness
  • Alcohol
  • Reflexes
  • Speed
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11
Q

What things can affect braking distance? [4]

A
  • Road conditions
  • Quality of brakes
  • Speed
  • Quality of tires
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12
Q

What is the equation for weight?

A

Weight (N) = mass (kg) x gravitational field strength (N/kg)

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13
Q

What is the equation for working out force?

A

Force = mass (kg) x acceleration

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14
Q

What is the equation for work done?

A

Work done = force x distance

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15
Q

What is Hooke’s law?

A

Extension of a spring is directly proportional to the force applied. Provided its limit of proportionality is not exceeded

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16
Q

What is the equation for gravitational potential energy?

A

Gravitational = weight (N) x Change in height (m)
potential
energy (J)

17
Q

What is the equation for gravitational potential energy when you don’t know the weight?

A 
Gravitational = mass (kg) x gravitational x change in height
potential                               field                            (m)
energy (J)                             strength (N/kg)
18
Q

What is the equation for kinetic energy?

A

Kinetic energy = 1/2 x mass x velocity²

19
Q

How do you convert grams into kilograms?

A

divide it by 1000

20
Q

What is the equation for momentum?

A

Momentum (kg m/s) = mass (kg) x velocity (m/s)

21
Q

Define impact forces

A

High shocks applied when two or more things collide over a short space of time

22
Q

Define what air bags do

A

They slow down a change in momentum reducing the impact force
A small hole means the head pushes the air slowly breaking their fall

23
Q

Define what seatbelts do

A

They stretch as the car suddenly stops slowing down a person’s stopping rate

24
Q

Define what a crumple zone does

A

It crumples up on impact which absorbs the main impact of a crash

Physics P2 (8 decks)

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