Show model answer and explanation
100
mgh=2×10×5.
Engineering admission · Other / specialist pathway · Physics
Mechanics, thermal physics, waves and electricity
Combine mechanical, thermal, wave and electrical principles.
Original Model Test for Exam unit. These questions and suggested practice times are independent Kidemy material, not an official or past paper. Choose modules for the target programme; all listed subjects are not required for every applicant.
Learn the idea
A multi-part problem may require different models in different stages. Identify when forces are constant, when losses are neglected and whether the circuit is idealised. Conservation calculations require a defined system. Do not transfer an equation to a new situation without its conditions.
Worked example
A 1 kg object falls 5 m from rest with g=10 m/s² and negligible drag. mgh=mv²/2 gives v=10 m/s. The potential-energy loss is 50 J; this model omits air resistance.
- Separate stages and assumptions.
- Choose laws for each stage.
- Check dimensions and energy accounts.
Your written practice
Show your working on paper and enter your answer here. If it does not match, compare the model and try again.
Show model answer and explanation
400
f=v/λ=300/0.75.
Show model answer and explanation
120
E=Pt.
Write in your own words. A guardian or teacher should review this response.
Show model answer and explanation
mgh=mv²/2 gives v=√(2gh)=√100=10 m/s.
Show cancellation and the loss assumption.
Write in your own words. A guardian or teacher should review this response.
Show model answer and explanation
Some gravitational energy transfers to the air and thermal stores rather than kinetic energy.
Account for energy without claiming it is lost from the total.
Physics model test
Solve a multi-stage energy problem and explain one model limit.
Review with a guardian or teacher
- Label units.
- State neglected effects.
- Check a result by a separate relation.
Keep your work on paper or in a local file. This page does not upload it or automatically grade the project.
Teacher-led lessons, schedules and prices for this outline are upcoming. You can use any starter practice above now without booking.
Your next step
Solo practice works without an account. Sign in to save a practice record to your learner profile.
Keep practising
Exact lesson links and related activities are labelled separately. Return-to-course links retain your selected learning path.