Question 1
Figure 1 shows a person about to dive from a high platform into a pool of water.
The person dived from the platform into the water.
The time taken between the person leaving the platform and entering the water was measured by four people.
The measurements were:
2.1 s 1.9 s 1.3 s 2.0 s
Which measurement is anomalous?
Tick () one box.
[1 mark]
Air resistance acted on the person during the dive.
Figure 2 shows the person moving vertically downwards.
Which arrow on Figure 2 shows the direction of the air resistance acting on the person?
Tick () one box.
[1 mark]
Air resistance is a contact force.
Which force is also a contact force?
Tick () one box.
[1 mark]
What happened to the size of the air resistance force as the speed of the person increased?
[1 mark]
After entering the water, the person decelerated for a time of 0.35 s.
The deceleration of the person was 60 m/s2.
Calculate the change in velocity of the person.
Use the equation:
change in velocity = deceleration × time
[2 marks]
The mass of the person was 75 kg.
Calculate the resultant force on the person when the deceleration was 60 m/s2.
Use the equation:
resultant force = mass × deceleration
[2 marks]