Changes

===Acceleration Equation===

Where:

: a = [[acceleration]]

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<math>a = {\frac{v-u}{t}} </math>

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<math>a = {\frac{v-u}{t}} </math>

<math>a = 40m/s/s </math>

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| style="height:20px; width:300px; text-align:center;" |'''A space probe is travelling at 18,000m/s and uses a thruster for 250 [[second]]s to slow down to 6,000m/s. Calculate the acceleration of the space probe.'''

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<math>a = {\frac{v-u}{t}} </math>

<math>a = 4m/s/s </math>

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<math>a = {\frac{v-u}{t}} </math>

==Key Stage 4==

===Meaning===

===About Acceleration===

: [[Acceleration]] is a [[vector]] because it has a [[magnitude]] and direction.

[[Acceleration]] may refer to:

*Increasing [[speed]] - The [[magnitude]] of the [[velocity]] increases.

*Changing direction - The [[magnitude]] of the [[velocity]] remains constant (constant [[speed]]) but the [[object]] changes direction of travel.

: [[Newton's First Law]] indicates that [[acceleration]] occurs due to [[Unbalanced Forces|unbalanced forces]] on an [[object]]:

===Force and Acceleration===

The passengers notice this [[acceleration]] because it feels as if a [[force]] is acting on them:

#When the car slows down for the roundabout the passengers feel the [[force]] of the seatbelt [[Deceleration|decelerating]] them.

#When the car turns quickly the passengers feel the [[force]] of the side door changing their direction.

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<math>a = {\frac{\Delta v}{t}} </math>

<math>a</math> = [[Acceleration]] of the [[object]].

<math>F=ma</math>

<math>F</math> = The [[Resultant Force]] on the [[object]].

<math>\Delta v</math> = 7.8 - 0 = 7.8m/s

| style="height:20px; width:200px; text-align:left;" |'''1. State the known quantities'''

<math>\Delta v</math> = 73 - 25 = 48m/s

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| style="height:20px; width:200px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''

{| class="wikitable"

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| style="height:20px; width:300px; text-align:center;" |'''A space probe is travelling at 18,100m/s and uses a thruster for 4.25 minutes to slow down to 6,200m/s. Calculate the acceleration of the space probe correct to two [[Significant Figures|significant figures]].'''

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<math>\Delta v</math> = 11 - 3.2 = 7.8m/s

| style="height:20px; width:200px; text-align:left;" |'''1. State the known quantities'''

<math>t \approx 1200s</math>

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