Photo AI
Which of these situations can increase the reaction time of a driver? Put a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 5 - 2015 - Paper 1
Question 5
Which of these situations can increase the reaction time of a driver? Put a cross (X) in the box next to your answer. A an icy road B worn tyres on his car C st... show full transcript
Worked Solution & Example Answer:Which of these situations can increase the reaction time of a driver? Put a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 5 - 2015 - Paper 1
Step 1
Step 2
(i) A car engine produces an average driving force of 1200 N. Calculate the work done by the force over this distance.
Answer
To calculate the work done (W), we can use the formula:
where:
- is the force (1200 N)
- is the distance (8.0 m)
Plugging in the values:
Thus, the work done by the force over this distance is 9600 J.
Step 3
(ii) The car has a mass of 1400 kg and travels at a velocity of 25 m/s. Calculate the kinetic energy of the car.
Answer
To calculate the kinetic energy (KE), we can use the formula:
KE = rac{1}{2} m v^2
where:
- is the mass (1400 kg)
- is the velocity (25 m/s)
Plugging in the values:
KE = rac{1}{2} imes 1400 ext{ kg} imes (25 ext{ m/s})^2 = 437500 ext{ J}
Thus, the kinetic energy of the car is 437500 J.