Speed, Velocity, & Acceleration
Velocity is speed plus this.
Direction
Scientists measure weight with this tool, using this unit.
spring scale and newtons
This is the sum, or total, of all the forces acting on an object.
This is the variable the scientist changes on purpose.
Independent
The formula for calculating acceleration.
A = (Vf - Vi) / t
A cyclist rides 60 meters in 12 seconds. This is her speed.
5 m/s
This is the amount of matter in an object, and it does not depend on gravity.
mass
When all of the forces on an object cancel each other out, the forces are called this.
balanced
This variable is the data collected, and it goes on the y axis of a graph.
Dependent
As gravity increases, mass...
stays the same
A hiker walks 6 km in the first 2 hours and 4 km in the next 2 hours. This is her average speed for the whole hike.
2.5 km/hr
Scientists measure mass with this tool, using these units.
a balance and grams or kilograms
A force diagram shows a net force of 0 N and no movement. The forces are balanced or unbalanced.
Balanced
A hypothesis should always include these three words.
If, then, because
True or false: a car diving around at a constant speed is not accelerating
false
A car traveling 25 m/s brakes and slows to 5 m/s in 4 seconds. Give its acceleration and what the sign tells you.
-5 m/s², meaning the car is decelerating (slowing down)
When an astronaut travels from Earth to the Moon, this one decreases while the other stays the same.
weight (decreases), mass (stays the same)
A force diagram shows an arrow going left a 12N and an arrow going right at 15N. What's the net force?
3N
Data that uses numbers is called this, and data that describes characteristics or categories is called this.
quantitative; qualitative
In Inv. 2.2 we tested how different surfaces affect the motion of a ball. The force that caused the ball to come to a stop is...
friction
A car drives around a curve at a constant 15 m/s. It is accelerating because THIS quantity is changing.
velocity
In Investigation 2.5, you hung 1, 2, 3, and then 4 washers on a spring scale. Explain the relationship we found after graphing.
proportional; linear
A force diagram shows an arrow going up at 8N and an arrow going down at 4N. It also shows an arrow going left at 2N and an arrow going right at 2N. What is the net force AND what is it's motion, if any?
4N; up
A student measures three bounce heights of a ball: 16 cm, 20 cm, and 21 cm. What is the mean bounce height?
19 cm
The two people had different reference frames.