DP Physics (last assessment 2024)
Question 21M.2.SL.TZ2.c
| Date | May 2021 | Marks available | [Maximum mark: 2] | Reference code | 21M.2.SL.TZ2.c |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Outline | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
21M.2.SL.TZ2.c
A football player kicks a stationary ball of mass 0.45 kg towards a wall. The initial speed of the ball after the kick is 19 m s−1 and the ball does not rotate. Air resistance is negligible and there is no wind.
In practice, air resistance affects the ball. Outline the effect that air resistance has on the vertical acceleration of the ball. Take the direction of the acceleration due to gravity to be positive.
[2]
Markscheme
air resistance opposes «direction of» motion
OR
air resistance opposes velocity ✓
on the way up «vertical» acceleration is increased OR greater than g ✓
on the way down «vertical» acceleration is decreased OR smaller than g ✓
Allow deceleration/acceleration but meaning must be clear
