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Projectile Motion Calculator

Calculate projectile motion parameters including range, maximum height, time of flight, and velocity components. Free physics projectile calculator.

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What is Projectile Motion?

Projectile motion describes the trajectory of an object launched into the air under the influence of gravity. The path follows a parabolic curve, determined by the initial velocity and launch angle. The motion splits into two independent components: horizontal (constant velocity) and vertical (constant acceleration due to gravity).

Projectile Motion Formulas

The calculator uses six key equations assuming no air resistance and constant gravity (g = 9.81 m/s²):

  • Horizontal Distance: x = vθcos(θ) × t
  • Vertical Distance: y = vθsin(θ) × t - ½gt²
  • Horizontal Velocity: vx = vθcos(θ)
  • Vertical Velocity: vy = vθsin(θ) - gt
  • Range (equal elevation): R = vθ²sin(2θ) / g
  • Maximum Height: H = vθ²sin²(θ) / (2g)

How to Use the Calculator

Select the equation type from the dropdown, then enter the required values:

  • Enter the initial velocity in meters per second
  • Enter the launch angle in degrees (0-90)
  • For distance and velocity equations that depend on time, enter the time in seconds

Applications

Projectile motion calculations are used in:

  • Sports science for analyzing ball trajectories
  • Military ballistics for artillery calculations
  • Civil engineering for water fountain and drainage design
  • Space exploration for suborbital trajectories

Also check: Uniformly Accelerated Motion Calculator, Pendulum Calculator, Force Calculator, Kinetic Energy Calculator, Work Calculator, and Momentum Calculator.

Frequently Asked Questions

How do you calculate projectile motion?

Break the velocity into horizontal and vertical components. Horizontal distance uses x = vcos(θ)t with constant velocity, vertical distance uses y = vsin(θ)t - ½gt² with constant downward acceleration g.

What launch angle gives the maximum range?

On flat ground in a vacuum, 45° maximizes range because sin(2 × 45°) = sin(90°) = 1 is the maximum value.

Why does horizontal velocity stay constant?

Gravity acts only vertically. With no horizontal force in a vacuum, the horizontal velocity cannot change and remains at vcos(θ) for the entire flight.

Does air resistance affect projectile motion?

Yes, significantly. Air resistance reduces both range and maximum height, and the trajectory is no longer a perfect parabola. These calculator equations assume a vacuum for simplicity.