DP Physics (last assessment 2024)

Question 21N.2.SL.TZ0.d.i

Date	November 2021	Marks available	[Maximum mark: 3]	Reference code	21N.2.SL.TZ0.d.i
Level	SL	Paper	2	Time zone	TZ0
Command term	Determine	Question number	d.i	Adapted from	N/A

d.i.

[Maximum mark: 3]

21N.2.SL.TZ0.d.i

A ball of mass 0.250 kg is released from rest at time t = 0, from a height H above a horizontal floor.

The graph shows the variation with time t of the velocity v of the ball. Air resistance is negligible. Take g = −9.80 m s⁻². The ball reaches the floor after 1.0 s.

Determine the average force exerted on the floor by the ball.

[3]

Markscheme

$∆ p = 0.250 \times (9.8 + 5.0)$ ✓

F_net = « $\frac{∆ p}{∆ t} = \frac{3.7}{0.1} =$ » $37$ «N» ✓

N $= 37 + 0.250 \times 9.8 = 39.5$ «N» ✓

Allow ECF for MP2 and MP3.

Syllabus sections

Core

Core » Topic 2: Mechanics » 2.3 – Work, energy, and power

Core » Topic 2: Mechanics » 2.4 – Momentum and impulse

Core » Topic 2: Mechanics

Question 21N.2.SL.TZ0.d.i

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