Chapter 6 Projectiles - Year 2

Question 1

What is the main theory about projectiles?

Answer 1

Horizontal velocity will remain constant so you can use d=st
The vertical velocity will only be effected by gravity (which is a constant deaccelerant) so you can use SUVAT

Question 2

What do you know is true at the TP of a projectile?

Answer 2

Vertical velocity will be = 0
But horizontal velocity is still constant

Question 3

Whenever you are asked to work out speed what should you be thinking?

Answer 3

You need to find the horizontal and vertical components then use pythagorus

Question 4

What does the range of the flight mean?

Answer 4

The total horizontal distance that it travels

Question 5

How do you calculate the range?

Answer 5

Use vertical velocity and the fact that at the vertical displacement (will be 0 if the projectile was fired from the floor or will be normally stated in the question (remember it will be negative)) then calculate the time taken for that
Then use d=st to calculate the horizontal distance

Question 6

How do you find the direction of motion of a particle?

Answer 6

You calculate the vertical and horizontal speeds then use trigonometry to work out the angle

Question 7

What is the general strategy for projectiles when you are not using numbers?

Answer 7

Use g not 9.8
Find a value of t (by vertical or horizontal velocity) in terms of u then sub it into the other equation to find an answer

Question 8

What is an important thing to remember in the end part of projectiles?

Answer 8

I haven’t had to ever factorise something with a t^2 +ut+6=0 in it
Working out the t and substituting it into the other equations can be done either way which produce different results