Forces

taught by Math Arena

Course description

Overview

This course is targeted at Singapore Cambridge GCE O level students, but is also relevant to IGCSE students and Singapore's Integrated program students.

Isaac Newton.

He's a big name in physics, with an equally big hairdo. You probably know him as the guy who got hit by an apple. He may seem like an old and outdated figure, but without his contributions to physics many of the things we take for granted now would not be possible (and that story about the apple is pretty fun!) This course, which investigates how forces make things move, is built heavily on the laws of motion that Newton laid down - the same laws which explain why you can make rockets fly upwards by pushing downwards, or why you seem to weigh more in an elevator accelerating upwards.

Course Content

You will learn:

  • Newton's 3 laws and how they work
  • How to figure out what direction an object is going to go in when multiple forces are exerted on it
  • How to figure out how fast that object's going to go
  • How friction and air resistance will affect its motion

You will also learn:

  • How to mess with the weight of an object
  • Why all objects fall at the same speed (let's say you dropped a squirrel and an echidna off the leaning tower of Pisa...)
  • Other cool stuff! (Some of the videos in this course are marked as "explanation videos", which go into greater depth on the topics covered. We try to bring in out-of-syllabus concepts where possible to make things more interesting and give a more complete understanding of the topic)

A link to the full O level Physics syllabus can be found here

Course Prerequisites

You will need to know:

  • How to watch videos on your computer
Math Arena
Math Arena

The instructor is from Math Arena.The instructor is absolutely passionate about teaching and you'll find the lessons engaging and ultimately rewarding.

Course Curriculum

Freefall
24:56
Q39 Two men jump out of an aeroplane at the same time. One of the men opens his parachute and the other man remains in free-fall. Why is the man in free-fall moving faster than the parachutist?
Q40 A steel ball is released just below the surface of thick oil in a cylinder. During the first few centimetres of travel, what is the acceleration of the ball?
Q41 An object X of mass m is released from a height h. Another object Y of mass 4m is released from a height 4h simultaneously. If both objects fall freely, which statement is true (ignoring air resistance)?
Q41 explanation
Q42 A ball bearing is released and sinks into liquid. It falls vertically until it reaches terminal velocity. In this duration, the resultant force on the ball bearing is
Q43 An experiment is carried out by an astronaut on the surface of the Moon. A coin and a feather are dropped at the same instant from the same height. Which statement is correct?
Q44 Two objects X and Y are identical in size and shape but X has 3 times the mass of Y. They are released from the same height in an evacuated chamber. Which one of the following statements is NOT correct?
Q45 A ball was dropped from the window of an apartment located at the tenth story of a high rise building. 1 second after release, the ball was observed to have fallen by exactly 2 storeys. At which storey will the ball be 2 seconds after it was released?
Q46 A student drops a table-tennis ball in air. What happens to the velocity and to the acceleration of the ball during the first few seconds after release?