2 (a) (i) Which of these is the correct equation that relates force, mass and acceleration? A F = m + a B F = m - a C F = m × a D F = m ÷ a (ii) A cyclist has a mass of 70kg - Edexcel - GCSE Physics - Question 2 - 2020 - Paper 1

To calculate the force, we use the formula:

$F = m \cdot a$

Where:

• Mass (m) = 70 kg
• Acceleration (a) = 2.0 m/s²

Thus, $F = 70 \text{ kg} \cdot 2.0 \text{ m/s}² = 140 \text{ N}$

Therefore, the force needed is 140 Newtons (N).

To find the average speed, we can use the equation:

$\text{average speed} = \frac{\text{distance}}{\text{time}}$

Here, the distance is 1200 m and the time is 80 s:

$\text{average speed} = \frac{1200 \text{ m}}{80 \text{ s}} = 15 \text{ m/s}$

Thus, the average speed of the cyclist is 15 m/s.

1. Use a suitable measuring device such as a trundle wheel or GPS to accurately measure the distance.
2. Utilize an electronic timer to improve the accuracy of measuring the time taken by the cyclist.