Kinematics and Efficiency Review

A quantity that is has magnitude and  direction is referred to as a

• vector quantity
• scalar quantity

An object can be moving for 10 seconds and still have zero displacement.

• True
• False

You run from your house to a friend's house that is 3 km away. You then walk home. The distance you traveled is 6 km. What is your displacement? 

• 6  km
• 0 km

Speed is a __________ quantity and velocity is a __________ quantity.

• scalar, vector
• vector, scalar

The fastest trains are magnetically levitated above the rails to avoid friction (and are therefore called

MagLev trains...cool, huh?). The fastest trains travel about 250 km in a half an hour. What is their

average speed in km/hour? (Check your units)

• 250 km/hr

• 500 km/hr

• 125 km/hr

An object is NOT accelerating if it is moving

• in a circle
• at constant velocity 
• at increasing speed
• only as influenced by gravity

Tags

NGSS.MS-PS2-2

A car slows down from +32 m/s to +8 m/s in 4 s. The acceleration is

• 6 m/s² opposite the motion

• 2m/s² in the direction of motion

• 8 m/s² opposite the motion

An airplane accelerates down a runway at 3.20 m/s²

for 8 s until it finally lifts off the ground.

Determine the velocity at take-off.

• 0.4 m/s

• 25.6 m/s

• 2.5 m/s

What is the formula to calculate speed?

• 
  

  $v\ =\frac{\Delta t}{\Delta d}$

• $v=\frac{\Delta d}{\Delta t}$

• $v=\Delta d\times\Delta t$

• $v=\Delta t\times\Delta d$
  

A change in velocity over time is known as:

• acceleration
• constant speed
• average speed
• displacement

Tags

NGSS.HS-PS2-1