Chapter 2 Flashcards

1
Q

Acceleration

A

Rate of change of velocity

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2
Q

Straight line in v-t graph

A

Constant acceleration

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3
Q

Steeper slope in v-t graph

A

Greater acceleration

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4
Q

Gradient is 0 in v-t graph

A

Velocity is constant

Acceleration is 0

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5
Q

Negative slope in v-t graph

A

Deceleration

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6
Q

Changing slope in v-t graph

A

Acceleration is changing

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7
Q

Gradient of v-t graph and

Area of v-t graph

A

Acceleration and

Displacement

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8
Q

What measures velocity and acceleration

A

Accelerometer

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9
Q

Using light gates to determine velocity and acceleration

A

Calculate initial and final acceleration:
u = L1/T2-T1
v= L2/ T4-T3
a = v-u/t3-t1

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10
Q

Using ticker-timer to determine velocity and acceleration

A

Dots at certain interval represent time interval
Length of interval in cm is displacement
Gradient is the acceleration

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11
Q

Equation 1 of equations of motion

A

V = u + at

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12
Q

Equation 2 of equations of motion

A

S = (u+v)/2 x t

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13
Q

Equation 3 of equations of motion

A

S = ut + 1/2at^2

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14
Q

Equation 4 of equations of motion

A

V^2 = u^2 + 2as

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15
Q

When the equations of motion be used

A

For motion in a straight line

For an object with constant acceleration

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16
Q

Deriving equation 1 of the equations of motion

A

a = v-u/t

Make v the subject

17
Q

Deriving equation 2 of the equations of motion

A

Avg velocity = U+v/2
Displacement = avg velocity x time
S= u+v/2 x t

18
Q

Deriving equation 3 of the equations of motion

A

Equation 1: V = u + at
Equation 2: S = u+v/2 x t
Sub v from equation 1 into equation 2

19
Q

Deriving equation 4 of the equations of motion

A
Equation 1: v = u + at 
Equation 2: s = u+v/2 x t 
Sub t from equation 1 
Find lcd and multiply 
Make v^2 the subject
20
Q

How to find acceleration on a graph

A

Mark a point on the graph at time of interest
Draw a tangent to the curve at that point t
Make a right angled triangle to find gradient

21
Q

How to find acceleration caused by gravity

A
Acceleration of free fall 
V = 0 
Sub into s = ut + 1/2at^2 
Plot on a graph 
Find gradient 
Gradient = t^2 
t^2 = g/2 
g= 0.84/0.20 x 2
22
Q

How to find using a light gate

A

Find acceleration from initial and final velocity

23
Q

Component vectors

A

Y: cos
X: sin

24
Q

How to calculate the height of projectile

A
V^2 = U^2 + 2as 
Acceleration is negative 
U is known 
V is zero 
Find a
25
How to find time of a projectile
``` s= it + 1/2at^2 s=0 u is known G Acceleration is negative Find t ```
26
How to find the final displacement after falling a cliff
Displacement is negative | Use s = ut
27
The horizontal and vertical motion of a projectile and distance fallen
Horizontal: distance increase because unaffected by gravity so v = s/t Vertical: accelerating downwards Horizontal distance = v x t Vertical distance: u = 0 so use s= ut
28
How to find the time of a projectile thrown horizontally
``` Find for both vertical and horizontal planes: Find horizontal and vertical velocity Find time: S = ut U= 0 Calculate t^2 Distance travelled: Distance travelled = u x t ```
29
How to find the range of a projectile
``` Velocity: Horizontal and Vertical components initial velocity Time: s = ut Horizontal displacement s = v x t ```