Explain, using appropriate laws of motion, why the air exerts a force on the engine in the forward direction.

This question is taken from AQA 2016 question 1 part 2, http://filestore.aqa.org.uk/sample-papers-and-mark-schemes/2016/june/AQA-74071-QP-JUN16.PDF

The force is acting on the air by the engine. By Newton's 2nd law, force is the rate of change of momentum. The air is acted by a force, so it accelerates and has a change in magnitude.

By Newton's 3rd Law, all forces between two objects exist in equal magnitude and opposite direction. When the air is acted to the right by the engine, there is an equal and opposite force acted on the engine. The air moves backward, so the engine must move forward.

WL
Answered by William L. Physics tutor

6114 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

How can a car be changing velocity yet not changing speed?


A spherical object of mass 150kg is orbiting the Earth. The distance between the centre of the object and the centre of the Earth is 25,000m. What is the kinetic energy of the object?


A yacht is sailing through water that is flowing due west at 2m/s. The velocity of the yacht relative to the water is 6m/s due south. The yacht has a resultant velocity of V m/s on a bearing of theta. Find V and theta


Describe Newton's second law.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences