PHYS1001 Lecture 6: Lecture 6
Lecture 6-projectile motion
ā¢ For every day projectiles we will assume gravitational acceleration is constant. Valid
for-
ā¢ ļ®
ā¢ Near earthās surface ļ®
ā¢ Over a distance much shorter than earthās radius ļ®
Constant force motion
ā¢ Under a constant force ļ®
ā¦ Acceleration graph is a straight line ļ®
ā¦ Velocity is a straight line ļ®
ā¦ Displacement- upside down parabola ļ®
ā¢ Equations of motion: ļ®
ā¢ a(t)= a ļ®
ā¢ v(t)= v(initial) +at ļ®
ā¢ y(t)= y(initial) + v(y)t +1/2at^2 ļ®
ā¢ x(t)=x(initial) +v(x)t ļ®
ā¦ This is for a given direction which weāve called y ļ®
ā¢ General equation: r= r +vt +1/2at^2 ļ®
ā¦ *a=-9.8 ļ®
ā¢ Each axis of motion is independent of the other axes ļ®
ā¦ Gravity acts only vertical so: ļ®
āŖ There in only acceleration in the vertical direction ļ®
āŖ The horizontal velocity remains constant because of inertia ļ®
āŖ I.e. if something is fired straight up and something is fired at an angle if
they have the same vertical velocity they will reach the same
height ļ®
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Lecture 6-projectile motion: for every day projectiles we will assume gravitational acceleration is constant. Displacement- upside down parabola: near earth"s surface, over a distance much shorter than earth"s radius. Constant force motion: under a constant force, equations of motion, a(t)= a, v(t)= v(initial) +at, y(t)= y(initial) + v(y)t +1/2at^2, x(t)=x(initial) +v(x)t, general equation: r= r +vt +1/2at^2, each axis of motion is independent of the other axes. This is for a given direction which we"ve called y. There in only acceleration in the vertical direction. The horizontal velocity remains constant because of inertia.