A
What is motion?
A change in position over time
+30 points
What type of motion is projectile motion?
Two-dimensional motion
+160 points
What is velocity?
Speed with direction
+60 points
What does “uniform motion” mean?
Constant speed
-90 points
Does gravity affect horizontal motion?
No
-200
What is the SI unit of time?
Second (s)
-30 points
What are the two directions usually called in 2D motion?
Horizontal and vertical
-120 points
What happens to velocity when acceleration is negative?
Velocity decreases
-110 points
What is speed?
Distance divided by time
+40 points
In projectile motion, what happens to horizontal velocity (ignoring air resistance)?
It stays constant
+180 points
What is the SI unit of distance?
Meter (m)
-20 points
If an object is at rest, what is its velocity?
Zero
-70 points
At the highest point of a projectile, what is its vertical velocity?
Zero
+180
What is acceleration?
Change in velocity over time
-50 points
In projectile motion, what happens to vertical velocity?
It changes due to gravity
-170 points
What force causes a projectile to fall downward?
Gravity
-150 points
What happens to velocity when acceleration is positive?
Velocity increases
+120 points
If a car moves at constant speed in a straight line, what is its acceleration?
Zero
+80 points
Motion in two dimensions happens in how many directions?
Two directions
+140 points
What is the formula for speed?
Speed = Distance ÷ Time
+100 points