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# Physics on the Road - Lesson 4

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### Physics on the Road - Lesson 4

1. 1. Starter -Match the velocities 30 km day-1 30 km hour-1 30 km min-1 30 km s-1 300 km ms-1 Make a little table
2. 2. Velocity vectors Mapping space and time lesson 4
3. 3. LI…  Know that velocity is a vector  Use velocity = displacement/time (v =s/t)  Resolve velocity vectors
4. 4. Scalar or vector  Speed is scalar speed = distance time v = s / t Measured in metres per second ms-1  Velocity is a vector velocity = displacement time v = s / t Measured in metres per second ms-1
5. 5. Velocity and speed of earth around the sun  Speed is large and constant  Velocity changes all the time  Average velocity over one year is zero sun dec jun mar jul sep y x
6. 6. Adding vectors – tail wind  A plane can fly at 120 ms-1 in calm conditions, if it has a tail wind of 20 ms-1, how fast will it fly?  The resultant velocity is the sum of the two. You add them.  To add vectors you put them tip to tail. 120 ms-1 140 ms-1 20 ms-1
7. 7. Adding vectors – Head wind  A plane can fly at 120 ms-1 in calm conditions, if it has a head wind of 20 ms-1, how fast will it fly?  The resultant velocity is the sum of the two. You add them.  To add vectors you put them tip to tail. 120 ms-1 100 ms-1 20 ms-1
8. 8. Adding vectors – Cross wind  A plane can fly at 120 ms-1 in calm conditions, if it has a cross wind of 20 ms-1, how fast will it fly?  The resultant velocity is the sum of the two. You add them.  To add vectors you put them tip to tail. 120 ms-1 122 ms-1 20 ms-1 20 120
9. 9. River crossing  A motor boat can travel at 5 ms-1 in calm conditions.  The boat makes a crossing from the south to north shore. The skipper maintains a northward heading.  The river runs west to east at 2 ms-1.  What is the velocity of the boat as it crosses? If the river is 50m where does he land? North shore South Shore 2 ms-1
10. 10. River crossing 2  A motor boat can travel at 5 ms-1 in calm conditions.  The river runs west to east at 2 ms-1.  The boat makes a crossing from the south to north shore. The skipper navigates along the route shown.  What is the velocity of the boat as it crosses? What direction does he need to steer?  How long does he take? North shore South Shore 2 ms-1