Vocabulary
What is force?
A push and a pull
If a force acts in the SAME direction as motion, what happens?
The object speeds up.
What is the formula for speed?
speed=distancet/time
A line graph shows distance increasing quickly over time. What does this tell you about speed?
The object is moving fast.
Complete the sentence:
Because the force acted opposite the motion, the object _____.
slowed down
What is motion?
When an object changes position.
If a force acts in the OPPOSITE direction of motion, what happens?
The object slows down.
A turtle travels 20 meters in 10 minutes. What is its speed?
speed=20 meters/10 minutes=2m/min
A graph line becomes steeper over time. What is happening to the object?
The object is speeding up.
Complete the sentence:
As the skateboarder pushed harder, the skateboard ________.
sped up
What is velocity?
Speed in a specific direction.
A soccer ball is moving right. A force pushes left. What will most likely happen?
The ball slows down.
A car travels 60 miles in 2 hours. What is its speed?
speed=60 miles/2 hours=30 mph
Look at this data table:
Time (s)Distance (m)
1 2
2 4
3 6
4 8
What is the speed?
2 m/s
Use comparative language:
A car moving at 40 mph is traveling ________ than a car moving at 20 mph.
faster
What are controlled variables?
Parts of an experiment that are kept the same.
Why can astronauts continue floating through space without a force pushing them?
Objects continue moving unless a force changes their motion.
A biker travels 30 meters north in 10 seconds. What is the biker’s velocity?
3m/s north
A graph shows a flat horizontal line for distance over time. What does this mean?
The object is not moving.
A graph shows one runner’s line is steeper than another runner’s line. Compare the runners.
The runner with the steeper line moved faster.
What is an experimental error?
Mistakes or problems that affect results.
A hockey puck moves north. A force pushes west. What will happen?
The puck changes direction.
A puck changes velocity from –3 m/s to –7 m/s. Did it speed up, slow down, or change direction?
It sped up because the number moved farther from zero while staying negative.
A student says, “The object moved farther each second, therefore the speed increased.”
Do you agree? Explain.
Not necessarily. You would need to know if the distance increased by larger amounts each second. Equal increases mean constant speed.
A student changed two variables during an experiment. What effect could this have on the results?
It could increase experimental error and make results less reliable.