# P5c: Projectile Motion

Many sports involve throwing, striking or kicking a ball. We are more than familiar with the path taken by a ball that is thrown to us, yet to have our hands in the right position to catch it, requires our brain to analyse the situation very quickly. The shape of the path or ‘trajectory’ together with the calculations behind this are considered here. Trajectories taken by golf balls and cricket balls can be illustrated by using ICT for teaching and learning. The ‘pearls in the air’ demonstration provides experience of scientific models.

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What is the path of a projectile called?
Trajectory.
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What would cause an object to have a curved path?
Projected horizontally in the Earth's gravitational field.
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In sport, what does the range of a ball struck depend on?
The launch angle.
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What is the optimum angle for a ball being struck?
45°
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What word describes the trajectory of an object projected in the earth's gravitational field?
Parabolic.
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What are vectors?
The horizontal and vertical velocities of a projectile.
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What is the resultant velocity of a projectile?
The vector sum of the horizontal and fertile velocities.
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What force - except air resistance - acts on a ball during it's flight?
Gravity.
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What type of acceleration do projectiles have?
A downward acceleration.
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Which velocity does a downward acceleration affect?
The vertical velocity.
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Talk about an object projected horizontally. (In terms of gravity and velocity)
The horizontal velocity is unaffected by gravity, therefore the horizontal velocity is constant. Gravity causes the vertical velocity to change.
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Talk about acceleration for a projectile in Earth's gravitation field - ignoring air resistance.
There is no acceleration in the horizontal direction (a constant horizontal velocity) the acceleration due to gravity acts in a vertical direction (steadily increasing vertical velocity)
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## Other cards in this set

### Card 2

#### Front

What would cause an object to have a curved path?

#### Back

Projected horizontally in the Earth's gravitational field.

### Card 3

#### Front

In sport, what does the range of a ball struck depend on?

### Card 4

#### Front

What is the optimum angle for a ball being struck?

### Card 5

#### Front

What word describes the trajectory of an object projected in the earth's gravitational field?