Motion and Force
You're riding a roller coaster. If you use this as a reference point, you are not moving.
This is calculated by dividing time into distance, without taking into account direction.
What is speed?
This is the reason why a kitchen table doesn't just move on its own.
What is inertia or Newton's First Law?
This is the acceleration due to gravity on Earth to two significant figures.
What is 9.8 m/s2?
Finding the slope of a segment on a distance-time graph will give you this.
What is velocity?
This is used for comparison to determine if something is in motion.
What is a reference frame/point?
Velocity and acceleration are these, which means that they have both magnitude and direction.
If the ground didn't exert this on your foot as you step to walk, then you'd fall and wouldn't be able to walk.
What is a reaction force?
A lot of businesses have decorative pieces on the edges of cement planters to prevent skateboarders from doing tricks on them because this damages the planters.
What is sliding friction?
Finding the slope of a segment on a velocity-time graph will give you this.
Acceleration
This is equal to one kilogram times meters per second per second.
What is a newton?
If an object is not accelerating, then this is the net force that's acting on it.
What is zero (newtons)?
Competitive swimmers often shave their arms and legs to decrease this.
If a segment on a velocity-time graph goes below the x-axis into the negative y-values, it means this.
What is the object is moving backwards?
This contact force is perpendicular to a surface and is equal in strength to the downward force of gravity acting on an object.
What is the normal force?
If a car goes from 9 m/s to 25 m/s in 10 seconds, what is its acceleration?
What is 1.6 m/s2?
This law is the main reason why rockets are able to take off from Earth into space.
What is Newton's Third Law?
If an object is 20 kg on the Moon, this would be its weight on Earth.
What is 196 N?
If a line segment on an acceleration-time graph dips below the x-axis into the negative y-values, then the object is doing this.
What is decelerating?
To calculate this, all forces (including their directions) acting on an object are added together.
What is net force?
If a car has an acceleration of zero, one of these two things could be happening.
What is the car is either at rest or is moving at a constant velocity?
You pull yourself up on a pull-up bar. This is the reason why the pull-up bar's reaction force is not balanced with your action force.
What is the action and reaction forces are acting on different object? (The action force on the bar and the reaction force on you.)
The orbit of the Earth around the Sun is in the shape of an ellipse (a flattened circle) because of these two things.
What are gravity and inertia?