Motion
What is an object's change in position relative to a reference point?
Motion
What is a push or a pull?
A force
What is a force that opposes motion between two objects that are in contact?
Friction
What is a force of attraction between two objects that is caused bu mass?
Gravity
How do you calculate speed?
What is distance divided by time equal?
The speed of an object
The SI unit for force?
A newton
Which will have more friction?
cleats
or
Micheal Jackson's shoes
The cleats
Who discovered gravity
Sir Isaac Newton
What is Earth's gravity?
9.8 m/s^2
What is the speed of an object in a particular direction?
ex: 50 mph south
Velocity
What is the combination of all the forces acting on an object?
The net force
What causes friction?
Microscopic hills and valleys
What is the measure of the gravitational force on an object?
Weight
How do you calculate the net force of an object being pulled in opposite directions?
Force pulling right - Force pulling left = Net Force
What is the rate at which velocity changes over time?
Acceleration
What is the symbol for a newton
N
What are the two types of friction?
Kinetic & static friction
What is the measure of how much matter is in an object?
Mass
What fraction of the Earth's gravity is on the Moon?
1/6
What is the SI unit for speed?
Meters per second (m/s)
How many newtons does it take to break the typical human femur?
About 4000 newtons
Which has more friction?
a book
or
a truck
The truck
Which changes depending on where you are?
Mass
or
Weight
Weight
How do you calculate force?
Force = Mass x Acceleration (F=ma)