Unit 1 Lesson 1 Week 3 Vocabulary/Concept Review

This is the change in an object's position.

Example: A metal ball moves from one side of the room to the other side.

• motion

• velocity

• inertia

This is how fast an object's position changes over time.

Example: The highest ___ of Taiwan's high speed train is about 300 km/h (kilometers per hour).

• speed

• friction

• force

This is the speed and direction of an object.
This includes distance, time, and direction.

Example: An airplane flies east (direction) 600 miles (distance) in two hours (time).

• velocity

• accelerion

• motion

This is a change in velocity over time.

Example: You're on a skateboard You start moving slowly at 2 meters per second forward. Then, you push harder and speed up to 4 meters per second in the same direction.

• acceleration

• friction

• inertia

This is any push or pull. It can cause an object to start moving, stop moving, or change direction.

Example: Gravity is the ___ that causes the skydiver to fall toward the earth.

• force

• speed

• acceleration

This is the tendency of an object in motion to stay in motion or of an object at rest to stay at rest.

Example: When the car stops suddenly, your body keeps moving forward. That's because of ___. Things want to keep moving the way they were moving unless something (like a seatbelt) stops them.

• inertia

• velocity

• acceleration

This is the force between surfaces that slows objects or stops them from moving.

When you drive on an icy road, there is reduced ___. You have to be more careful when you drive in icy conditions.

• friction

• inertia

• motion