Physics - CH.3 Forces and movement

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Last updated 5:31 PM on 4/13/26
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18 Terms

1
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equation of force, mass and acceleration

force = mass x acceleration

2
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why is a linear air track used

to remove the effects of friction

3
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what measures the acceleration of a glider

electronic timer and light gates

4
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what is the variable being investigated - force

the effect of force is done by measuring the acceleration of the glider with different falling mass ( different forces pulling on the glider) . The mass of the glider must remain constant

5
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what is the variable being investigated - mass

the effect of the mass is done by measuring the acceleration glider when adding different masses to the glider

6
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what does this investigation show

this shows us that acceleration is directly proportional to force but that acceleration is inversely proportional to mass, if you double the mass you half the acceleration

7
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what is the thinking distance

the distance a car travels whilst the person is reacting

8
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what is the breaking distance

the distance a car travels whilst breaking/ under the breaking force

9
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factors affecting thinking distance

  • distractions

  • alcohol

  • drugs

  • tiredness

  • age

10
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factors affecting breaking distance

  • road conditions/ weather - snow, wet roads

  • condition of tyres

  • condition of brakes

  • mass of car

  • speed of car

11
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what is the relationship between speed and thinking distance

They are directly proportional if you increase speed you increase thinking distance, the straight lien shows the reaction time is constant

<p>They are directly proportional if you increase speed you increase thinking distance, the straight lien shows the reaction time is constant</p>
12
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what is the relationship between speed and braking distance

the force of the breaks is constant however when you double the speed you quadruple the kinetic energy ( Ek = ½ mv2 ), therefore the breaking distance more than doubles this means BD increases at a faster rate than thinking distance as evident by the graph

<p>the force of the breaks is constant however when you double the speed you quadruple the kinetic energy ( E<sub>k</sub> = ½ mv<sup>2</sup> ), therefore the breaking distance more than doubles this means BD increases at a faster rate than thinking distance as evident by the graph</p>
13
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velocity - time graphs

  • initial line is the thinking distance

  • slopping line is the braking distance

  • total graph is the stopping distance

<ul><li><p>initial line is the thinking distance</p></li><li><p>slopping line is the braking distance</p></li><li><p>total graph is the stopping distance</p></li></ul><p></p>
14
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how do you find deceleration

( v - u )/t

  • V is the end of the line for BD

  • U is the initial speed or velocity of the car

  • t is only the time of braking distance not thinking distance

15
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how do you find thinking distance

initial velocity x reaction time

16
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how do you find the braking distance

( initial velocity x time of braking distance )/ 2 - if a triangle

17
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what is overall stopping distance

TD + BD

18
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relationship between speed and drag

speed increase = drag decreases