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1.5 Entrance Activity Answers

1.5 Entrance Activity Answers

27 August 2010

12:15

Entrance Activity

·         Tell the person next to you…

1.                            The formula that links d, v and t

v = d/t

·         The units of time

s

3.    The formula that links ∆v, ∆t and a

a = ∆v / ∆t

4.    The units of velocity

m/s

5.    The formula that links v, t, u and a

a = v - u / t

6.    The units of acceleration

m/s2

Questions on Acceleration

1.  A car changes its velocity by 30 m/s in 5 seconds, what is the acceleration of the car?

v=30m/s

t=5s

a=∆v/∆t

a=30/5

a=6m/s2

 

2.  A bike starts from rest and accelerates to 20 m/s  over a period of 6 seconds. What is the acceleration of the car?

v=20m/s

t=6s

a=∆v/∆t

a=20/6

a=3.33m/s2

 

3.  A man moving at 2 m/s accelerates at a rate of 3 m/s2 for 2.5 seconds. What is the new velocity of the man?

a=3m/s2

t=2.5s

ax∆t=∆v

3x2.5=∆v

v=7.5m/s

 

4.  A car decelerates from 60 m/s to 20 m/s at a rate of -5 m/s2. How long does this deceleration take the car?

v= -40m/s

a= -5m/s2

t=∆v x a

t=-40x-5

t=200s

Syllabus Statement 1.4 - Acceleration

Click here to download:
Accel formula.ppt (172 KB)
(download)

 

 

·         1.4 recall and use the relationship between acceleration, velocity and time:

acceleration = change in velocity         a = (v - u)      

                         time taken                               t

Questions on Physics

1.   A car travels a distance of 100 metres in 20 seconds. What is the speed of the car?

d = 100m

t =20s

v = d/t

v = 100/20

v = 5m/s

 

2.   A bike travels at a speed of 20 m/s for 20 seconds. How far does the bike travel in this time?

v = 20m/s

t = 20

d= v x t

d =20 x 20

d = 400m

 

3.   A car travels at 30 m/s for 2 minutes. How far has it travelled in this time?

v = 30m/s

t = 120s

d = v x t

d = 30 x 120

d =3600m

4.   A car travels at 30 km/hour. How far, in metres, will the car cover in 90 seconds?

v = 8.3m/s

t = 90s

d = v x t

d = 8.3 x 90

d = 750m

Syllabus Statement 1.3 - v=d/t

Click here to download:
1A1ppt velocity speed formula.ppt (159 KB)
(download)

 

1.3

Tuesday, July 06, 2010

3:04 PM

•        1.3 recall and use the relationship between average speed, distance moved and time:            

  average speed = distance moved             v = d

                              time taken                       t