Relative Motion

Which would result in the most damaging collision?

• A car travelling at 90km/h colliding with a parked car

• A car travelling at 70km/h colliding with a car doing 60km/h moving in the same direction.

• A car travelling at 70km/h and colliding with a car doing 60 km/h in the opposite direction.

• a car travelling at 70km/h and colliding with a car doing 10 km/h in the opposite direction

The diagrams show two cars travelling along a road in the same direction. The cars are travelling at a different but constant speeds. Picture 2 is taken 10 seconds after Picture 1. How far has car A travelled between Picture 1 and Picture 2?

• 10m

• 40m

• 70m

• 80m

The diagrams show two cars travelling along a road in the same direction. The cars are travelling at a different but constant speeds. Picture 2 is taken 10 seconds after Picture 1. How far has car B travelled between Picture 1 and Picture 2?

• 10m

• 40m

• 70m

• 80m

Car A has travelled a distance of 70m over 10 seconds. Calculate the speed the of car A.

• 10 m/s

• 8 km/s

• 7m/s

• 7 mph

Car B has travelled a distance of 80m over 10 seconds. Calculate the speed the of car A.

• 8 kmh

• 8 m/s

• 7m/s

• 7 mph

If a Car A is travelling at 60km/h and Car B is travelling at 80km/h what is the relative speed?

• Car B is 10 kmh faster

• Car A is 10 mph faster

• Car B is 20 kmh faster

• Car B is 20 mph faster

Look at the picture. How far apart will the two cars be after 5 seconds?

• 55m

• 50m

• 20m

• 25m