NW2 Review

What is speed?

• how far you go

• how much distance is covered over a period of time

• how fast you accelerate

• the change in the location of a object

Answer explanation

Speed is defined as how much distance is covered over a period of time. This means it measures how quickly an object moves, making the correct choice the one that accurately describes this relationship.

Tags

NGSS.MS-PS3-1

What two measurements are necessary for calculating speed?

• Mass and time

• Temperature and mass

• Mass and distance

• Distance and time

Answer explanation

To calculate speed, you need to know how far an object has traveled (distance) and how long it took to travel that distance (time). Therefore, the correct measurements for calculating speed are distance and time.

What is velocity?

• the quickness of an object
• the location of an object
• acceleration
• speed in a specific direction

Tags

NGSS.MS-PS3-1

The salesmen is running away from his customers towards his house in the south at 9 m/s

• speed

• velocity

Answer explanation

The correct choice is 'velocity' because it includes both speed and direction. The salesman is moving south at 9 m/s, which specifies his direction, making it a velocity rather than just a speed.

A cat runs at 10 m/s

• speed

• velocity

Answer explanation

The correct choice is 'speed' because it refers to how fast an object is moving, regardless of direction. 'Velocity' includes direction, but the question only states the speed of the cat.

Tags

NGSS.MS-PS3-1

A bird is flying south at 30 miles per hour.

• speed

• velocity

Answer explanation

The correct answer is 'velocity' because it includes both speed and direction. The bird's speed is 30 miles per hour, but since it is flying south, we refer to its motion as velocity.

Velocity MUST include...

• speed

• direction

• magnitude

• mass

Maddy walked her dogs, Leia and Nala, at a speed of 3 miles per hour.

• speed

• velocity

Velocity is both ____ and _____. 

• speed , direction 
• direction, mass
• volume, density 
• direction, magnitude 

Which of the following is a unit of speed ?

• sec
• mi
• m/s
• min