Speed Demons
This is the point or object used to decide if something is moving.
What is a reference point?
Speed is calculated by dividing distance by this.
What is time?
This happens when forces on an object are equal and opposite.
What are balanced forces?
This force pulls objects toward Earth.
What is gravity?
On a position vs. time graph, time is shown on this axis.
What is the x-axis?
Motion is described using position, direction, and this measurement of how fast an object moves.
What is speed?
A bike travels 20 meters in 4 seconds. What is its speed?
When forces are unbalanced, an object will do this.
What is change its motion?
This force makes it harder for objects to start or keep moving when surfaces touch.
What is friction?
A straight diagonal line on a position vs. time graph shows this type of motion.
What is constant speed?
Two runners start at the same place. One finishes first. What evidence shows which runner is faster?
What is the time it took to travel the same distance?
A car travels 100 meters in 10 seconds. A scooter travels 50 meters in 10 seconds. Which is faster and why?
What is the car, because it has a greater speed (10 m/s vs. 5 m/s)?
A box is pushed right with 10 N and left with 10 N. What is the net force?
What is 0 N?
A toy car is pushed forward with 12 N. Friction pushes backward with 5 N.
Question:
What is the net force, and in which direction will the car move?
What is 7 N forward?
A flat line on a position vs. time graph means the object is doing this.
What is not moving?
If an object’s speed changes over time, the object is doing this.
What is accelerating?
An object’s speed increases from 2 m/s to 6 m/s in 4 seconds. Is it accelerating?
What is yes, because its speed changed over time?
A cart is pushed right with 15 N and left with 5 N. What is the net force and direction?
What is 10 N to the right?
A ball and a textbook are dropped from the same height at the same time. Ignoring air resistance, which object will hit the ground first, and why?
What is neither?
If one line on a graph is steeper than another, that object is moving this way.
What is faster?
A book is pushed to the right with 8 N. Another student pushes the book to the left with 8 N.
Question:
What is the net force acting on the book?
What is 0 N?
Runner A runs 60 m in 6 s. Runner B runs 90 m in 9 s. Who is faster? Show the evidence.
What is neither—both have the same speed of 10 m/s?
A soccer ball is kicked and slows down because of this force between touching surfaces.
What is friction?
A box is pushed to the right by two students.
Student A pushes with 10 N right
Student B pushes with 6 N right
Friction pushes 8 N left
Question:
What is the net force acting on the box?
What is 8 N to the right?
Two objects start together, but one line curves upward. What does this show?
What is acceleration?