*Motion*is the action of changing location or position used in Physics (as opposed to

*moving*in ordinary speech). One often has to deal with this term in reality to solve real-life problems.

First, you need to learn some basic terms. You probably know about

*position*,

*distance*and

*time*. Use the link to watch a video lesson and find out what displacement, velocity and acceleration are.

**Видеоролик**

Now, let’s solve some related problems.

1. Acceleration is crucial for racing. A racecar starts from rest and speeds up uniformly to the right until it reaches a maximum velocity of 60 m/s in 15 seconds.

What is the acceleration of the racecar?

*Answer using a coordinate system where rightward is positive.*

_____ m/s2

2. A teacher of physics living in New York usually goes to his favourite Japanese grocery store on Saturday. His route is shown on the map and follows these steps:

follow the Hudson River upriver 🡪 cross the river using the George Washington Bridge 🡪 reverse direction and head downriver

Work out the distance he walks and his actual displacement.

A Distance: ____ km

B Displacement: ____ km

3. To build an airport you need to calculate the length of the runway. An aeroplane accelerates down a runway at 3.20 m/s2 for 32.8 s until it finally lifts off the ground. Determine the distance travelled before takeoff:

____ m