Vocab
A measure of mass per volume for a substance
density
What is the 1st step to building a hypothesis?
Observe
What is the density of a box that weighs 35 kg and has a volume of 7 in?
5 kg/in
A train accelerates from 40 kilometers per hour to 80 kilometers per hour in 20 seconds. What is the train's acceleration in kilometers per hour per second?
2 kilometers per hour
<-----3N and 8N ----->
Find the Net Force
5N right
measures both speed and direction of motion
velocity
What is the 5th step to building a hypothesis?
Test Predictions
What is the density of a sphere that is 100 kg. and has a volume of 20 ft?
5 kg/ft
A car increases its speed from 5 meters per second to 25 meters per second in 4 seconds. What is the car's acceleration?
5 meter per second
<---- 12N ----> 22N
<---- 10 N and ----> 11N
Find the Net Force
11N right
the property of things to resist changes in motion
inertia
What is the 2nd step to creating an experiment?
Assign subjects to groups
What does inertia depend on?
mass
A train travels 200 miles in 4 hours. What is the train’s average speed in miles per hour?
50 miles per hour
<---- 18N and ----> 36N
18N right
resisting force that opposes the motion or attempted motion of an object
friction
what is the 4th step to creating an experiment?
ask a testable question
Why is air resistance a form of friction?
it is a force that pushes back on an object moving through the air
Jamie is biking at a speed of 12 miles per hour. If Jamie rides for 3 hours, how far will Jamie travel?
4 miles
What are 2 simple machines?
pulley and pivot
vector sum of all forces acting on a nonaccelerating object equals zero
equilibrium
what is the 7th step to creating an experiment?
collect and analyze the data
What does friction depend on?
Material and how much you press together
A train traveling at a speed of 120 miles per hour takes 3 hours to get to its destination. How far did the train travel?
360 miles
What is the conservation of energy?
Energy is not created or destroyed, it is transferred.