7th Grade Motion

Units

100

This is the SI unit for mass

What is the kilogram? 

200

This is the SI unit for displacement

What is meters? 

300

This is the SI unit for velocity

What is m/s?

400

This is the SI unit for acceleration

What is m/s/s?

500

This is the numerical value for "g"

What is -9.8 m/s/s?

Equations

100

This is how to determine the displacement of an object

What is x_f - x_i ?

200

This is how we would determine velocity, given only displacement and time

What is velocity = displacement / time 

300

A delivery truck is pulling away from a warehouse. It starts from rest and reaches a speed of 18 m/s after 6 seconds of constant acceleration. What equation would I use to determine the acceleration? 

What is 

Acceleration = Change in Velocity / Time

400

A bike courier is delivering packages across a city. She travels 12 kilometers to her first stop, but due to heavy traffic and multiple red lights, it takes her 40 minutes to get there. On the return trip, traffic clears up and she covers the same distance in 20 minutes. What equation would I use to determine her average speed? 

What is 

s = d/t

500

A supply crate is dropped from a helicopter hovering 150 meters above the ground. What equation should I use to determine how fast it is moving after 3 seconds? 

What is 

v_f = v_i + at

Caculations

100

A hiker walks 3 km east, then 4 km west, and finally 2 km east. What is his distance and displacement traveled? (Be sure to include direction when necessary)

What is 

d = 9 km

Displacement = 1 km East

200

A worker is walking forward on a conveyor belt that is also moving forward. The conveyor belt moves at a constant speed of 2.5 m/s, and the worker walks at 1.8 m/s relative to the belt. What is the worker's resultant velocity? 

What is 4.8 m/s forward? 

300

A rock is dropped from a cliff and falls for 4 seconds before hitting the ground. What is the velocity of the rock just before hitting the ground? 

What is 39.2 m/s?

400

A car is merging onto a highway. It starts at a speed of 12 m/s and accelerates to 30 m/s over a period of 6 seconds. During this time, the car travels a total distance of 126 meters. What is the acceleration of the car? 

What is 3 m/s/s? 

500

An aircraft is coming in for an emergency landing on a short runway. As it touches down, its speed is 72 m/s. The pilot deploys revers thrusters and brakes, causing a uniform acceleration. The aircraft comes to a complete stop after 9 seconds. What does the acceleration of the aircraft need to be in order for it to come to a complete stop in time? 

What is -8 m/s/s? 

Definitions

100

What is the definition of a vector quantity? 

A quantity that requires both magnitude and direction

200

What is the definition of velocity? 

The rate of change of position

300

What is the definition of acceleration? 

The rate of change of velocity

400

What does "g" represent in physics 

The acceleration due to gravity

500

How is instantaneous velocity and average velocity different? 

When are they the same? 

Instantaneous velocity measures your velocity at an exact moment in time, average velocity measures your velocity over a long period of time

They are the same when the object is moving with a constant velocity

Unit Conversions

100

List the metric prefixes in order of largest to smallest

Tera, Giga, Mega, Kilo, hecto, deca, base, deci, centi, milli, micro, nano, pico

200

Which prefix represents 10⁶

What is Mega? 

300

Which prefix represents 10^-12

What is pico? 

400

Convert 340,000.25 micrometers to decimeters

What is 3.4000025 dm? 

500

Convert 12x10¹³ pm to Mm

What is 0.12 Mm?