Projectile Motion. If you throw a javelin…. What affects it’s flight? Gravity How hard you throw it (initial velocity) What angle you throw it at Air resistance (shape of javelin) Mass Which one of these has no affect?. Let’s take a look at how they affect flight!.
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What affects it’s flight?
Which one of these has no affect?
– an object that moves along a 2-D curved trajectory
- does not have any propulsion when in flight
- Constant velocity (0 accel.) in the x direction
- Equation : v = d/t
- Constant acceleration - 9.8 m/s2 [down]
- Use the accel. equations we used previously
One DimensionalProblems (no horiz. Velocity)
Case 1: Object dropped from rest
Case 2: Object thrown directly upwards
Two Dimensional Problems:
Case 3: Rolled over an edge
Case 4: Shot at an angle
Let’s analyze the four cases!
Break the initial velocity into horizontal and vertical components (using the given angle and trigonometry)
A tennis ball is rolled off a counter at 8 m/s, what will it’s position be after 3s?
Example Question (Case 4)
A golfer strikes a golf ball on level ground. The ball leaves the ground with an initial velocity of 42 m/s [32o above the horizontal].
a) What will the ball’s position be after 4 s?
b) What will be the maximum height attained?