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At the 2016 Rio de Janeiro Olympic Games, Wayde Van Niekerk set a new world record for the 400 m - Leaving Cert Physical Education - Question 17 - 2021
Question 17
At the 2016 Rio de Janeiro Olympic Games, Wayde Van Niekerk set a new world record for the 400 m. Figure 9 illustrates a 400 m running track. Figure 10 highlights Wa... show full transcript
Worked Solution & Example Answer:At the 2016 Rio de Janeiro Olympic Games, Wayde Van Niekerk set a new world record for the 400 m - Leaving Cert Physical Education - Question 17 - 2021
Step 1
Using your knowledge of vectors and scalars, explain the difference between distance and displacement.
Answer
Distance is a scalar quantity that refers to the total length of the path covered by an object, irrespective of direction. It is only concerned with magnitude, hence can be described in terms of units like meters. Displacement, on the other hand, is a vector quantity represented by both magnitude and direction. It indicates the shortest straight-line distance from the initial to the final position of the object.
Step 2
Step 3
Calculate Wayde’s average speed from the 200 m to the 300 m point during this race. Give your answer correct to 1 decimal place.
Answer
To calculate the average speed, we can use the formula: Average speed = Total distance travelled / Total time taken. From Figure 10, for the range of 200 m to 300 m, total distance = 100 m. Total time taken from the 200 m split time (31.04 s) to the 300 m split time (43.03 s) = 43.03 - 31.04 = 11.99 s. Thus, average speed = 100 m / 11.99 s = 8.34 m/s (to 1 dp).
Step 4
Suggest a reason why Wayde’s 100-200 m split is faster than his 0-100 m split.
Answer
Wayde's 100-200 m split being faster could be attributed to his increased acceleration and enhanced running efficiency as he settles into his rhythm after the initial 100 m, allowing for better pacing and energy conservation.
Step 5
Define Newton’s third law of motion.
Answer
Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that when one body exerts a force on another body, the second body exerts a force of equal magnitude and in the opposite direction back on the first body.
Step 6
Explain how Newton’s third law of motion applies to the skill being executed by Georgia in Figure 11.
Answer
As Georgia Drummy executes a tennis serve, the racquet exerts a force against the tennis ball, propelling it forward. According to Newton's third law, the ball reacts by exerting an equal and opposite force back on the racquet. This interaction allows the ball to achieve the necessary speed and trajectory for successful play.