8.8 - Projectile motion 2

Question 1

what is projectile-like motion

• what word describes this motion

Answer 1

motion where an object experiences a constant acceleration in a different direction to its velocity

- Parabolic

Question 2

give 2 examples of projectile-like motion

Answer 2

• path of a ball rolling across an inclined board, ball curves down the board in a parabolic motion
• path of a beam of electrons going through 2 oppositely charged parallel plates. e- accelerated constantly to the +ve plate. parabolic path is produced since there’s 0 acceleration of the motion parallel to the plates but a constant acceleration of the perpendicular motion

Question 3

object projected into the air, with speed u at angle Ø

• equations to calc horizontal and vertical displacement
• comparing a graph of gravity ‘on’ & ‘off’ on a vertical-horizontal motion graph

Answer 3

Horizontal s = utcosø

Vertical s = utsinø

Gravity on , vertical s = utsinø - 0.5gt^{<strong>2</strong>} [s= ut + o.5at²]

Question 4

How to calc the impact velocity of a projected object

Answer 4

calculate horizontal and vertical velocity

• convert them into components to form a right-angled triangle of velocity
• use Impact v² = horizontal v² + vertical v²