mechanical · 24 minutes · Official OETT Aligned
Objects Launched into the Air
Forward motion and falling happen together
What to know
- forward speed
- downward fall
- projectile: a launched object
- path through the air
You can solve a curved-path question by looking at forward motion and falling separately.
The core rule
An object moves forward while gravity pulls it down.
A projectile is an object that has been thrown, launched, or rolled off an edge. Without air resistance, its forward speed stays the same while its downward speed increases. Two balls launched horizontally from the same height take the same time to fall, even if one moves forward faster.
Worked examples
Example 1: easy
A ball rolled off a level table curves downward.
- The ball is already moving forward when it leaves the table.
- Gravity makes it fall at the same time, so its path curves down.
Forward motion and downward falling happen at the same time.
Example 2: medium
Two balls leave the same height together; the faster horizontal ball lands farther away, not later.
- Both balls start at the same height with no initial downward speed.
- They land at the same time. The faster ball travels farther forward.
Forward speed affects distance, not fall time in this example.
Example 3: hard
Use the launch height and forward speed to work out where each object lands.
- Read the launch height to find the falling time. Read the forward-speed arrow for each object.
- Multiply forward speed by falling time to find the landing distance.
Both speed and time matter when predicting where it lands.
Common mistakes
Moving forward keeps gravity from acting right away.
Gravity acts from the start. Faster forward motion carries an object farther, but does not delay its fall.
Put it into practice
Use guided explanations, check your answers, and try a new variation.