# topic 5 - forces

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state the two things acceleration is dependent on

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### 31 Terms

1

state the two things acceleration is dependent on

• mass of the object

• resultant force acting on object

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2

explain how to describe a graph showing acceleration and resultant force are directly proportional

• straight line

• through the origin

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3

state what the relationship between acceleration and resultant force is

directly proportional

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4

explain how to describe a graph showing acceleration and mass are inversely proportional

• curve

• not through the origin

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5

state the relationship between acceleration and mass

inversely proportional

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6

state the equation of newton’s second law

F (force) = m (mass) x a (acceleration)

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7

state what newton’s first law is

• an object will remain at rest or constant velocity

• unless there is an unbalanced resultant force acting on it

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8

state what the implications of newton’s first law are

• force causes CHANGES in motion

• forces aren’t required to keep motion going

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9

QUESTION: describe the effect of the resultant force acting forward on a car moving forward

• the resultant force causes the car to accelerate forwards

• in the same direction and motion as the resultant force

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10

QUESTION: describe the effect of the resultant force acting to the right on a car moving forward

• car turns right

• speed remains constant

• velocity changes as car changes direction

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11

state what force causes the circular motion of the earth

weight of the earth

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12

state what centripetal force is

• force that causes circular motion

• acts inwards in a circle

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13

state the equation to find kinetic energy

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14

state what the term ‘work done’ means

transfer of energy

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15

describe the energy transfer process as a vehicle slows down

• energy transferred from kinetic energy store of car

• to thermal energy store of brakes

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16

state the equation to find the initial velocity of an object in motion

(initial velocity)² = (final velocity)² + 2 (acceleration x distance)

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17

state how to calculate stopping distance

stopping distance = reaction distance + braking distance

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18

state the relationship between thinking distance and speed

directly proportional

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19

state how to calculate thinking distance

thinking distance = speed x reaction time

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20

state what factors affect thinking distance

• speed of vehicle

• reaction speed

• cognitive function of driver

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21

state the relationship between braking distance and speed

proportional (increases as the other increases) but not linear

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22

state what factors affect braking distance

• braking force from brakes

• mass of vehicle

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23

explain how the braking force of brakes affects braking distance

• type and condition of brakes impacts braking distance

• as brakes that are worn create less friction

• causing the car to need a larger distance to break fully

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24

explain why the condition of the road surface affects braking distance

• water or loose materials on surface reduces friction

• which increases braking distance

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25

state what principle the term constant velocity can be related to

newton’s first law

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26

state what no resultant force on an object means

object is stationary or at a constant velocity

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27

state what the term constant motion means

• same speed

• same direction

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28

state what newton’s second law is

unbalanced forces cause acceleration

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29

state what the term acceleration means

change in speed OR direction

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30

state what braking force can also be known as

acceleration acting backwards

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31

state the tonne to kilogram conversion

1 tonne = 1000 kilogram

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