Paper 2: Forces and Motion Flashcards

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1
Q

What is stationary on a distance-time graph

A

Straight line

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2
Q

What is stationary on a velocity-time graph

A

Touching bottom of the graph

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3
Q

What is constant speed on a velocity-time graph

A

Straight line

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3
Q

What is constant speed on distance-time graph

A

Diagonal line

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4
Q

What is accelerating on distance time graph

A

Exponential

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5
Q

What is accelerating on velocity time graph

A

Diagonal line

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6
Q

Describe the changing forces that effect an object as it falls and its speed changes

A

When first dropped GPE is at maximum
As the object falls GPE is gradually transferred to Kinetic Energy
The object accelerates as GPE and kinetic energy are stronger than air resistance
Eventually the force and air resistance will become the same due and due to newtons 3rd law it will maintain a terminal velocity
Resultant force is zero
Object at constant speed

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7
Q

What is the law to do with momentum

A

Conservation of momentum
The momentum before an event in a closed system is equal to the momentum after an event

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8
Q

Newton’s 3 laws

A
  1. An object will stay in rest or an object will stay in motion unless a force acts upon it
  2. Force= mass x acceleration
  3. For every action there is an equal an opposite reaction
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9
Q

Braking distance equation

A

Stopping distance = braking distance + thinking distance

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10
Q

Thinking distance

A

The distance traveled before the driver reacts and applies the brakes

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11
Q

Braking distance

A

The distance traveled while the brakes are being applied

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12
Q

What effects thinking distance

A

Alcohol, drugs, tiredness, age

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12
Q

What effects braking distance

A

road surface, weather, conditions of brakes

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13
Q

How do airbags, crumple zones and seat belts reduce injury in a car crash

A

Increase the time taken to slow down which means the force is spread over a longer amount of time

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14
Q

Average reaction time for an adult

A

0.2s-0.9s

15
Q

What is Hooke’s law

A

The amount of weight added to the bottom of a spring and its extension are directly proportional UNTIL A CERTAIN POINT

15
Q

Force and extension equation

A

Force = constant x extension

16
Q

What do you call the point where after an object is stretched it becomes permanently deformed

A

Elastic limit of proportionality

16
Q

When both clockwise and anti-clockwise moments are equal

A

An object is balanced

17
Q

What would you call levers and gears in physics

A

Force multipliers

18
Q

Why is there greater pressure on an object the deeper an object is in a fluid

A

More particles above pressing down on it

19
Q

What causes upthrust

A

The pressure on the underside of an object is greater than that of the top of the object

20
Q

Driving force

A

Force that allows vehicles to move

21
Q

Normal contact force

A

Push force between 2 solids, acts at right angles to the point of contact

21
Q

Inertial mass

A

How difficult it is to change the velocity of an object

22
Q
A
22
Q
A