Physics isn't just about memorising formulas - it's about understanding... Show more
Physics390 views·Updated May 12, 2026·2 pagesGCSE Combined Higher Physics Paper 2 Forces
R
ruby @rubymqy
1
of 2
Forces and Vectors Fundamentals
Scalars have magnitude only (like speed), whilst vectors have both magnitude and direction (like velocity). Think of arrows - the longer the arrow, the bigger the vector's magnitude.
When dealing with objects, the centre of mass is where all the mass appears to be concentrated. For symmetrical shapes, it's right in the middle, but for irregular shapes, you'll need to use a plumb line to find it.
Forces come in two flavours: contact forces (where objects physically touch) and non-contact forces (acting at a distance through fields like gravitational, electrostatic, or magnetic). When an object is in equilibrium, all forces are balanced and the resultant force equals zero.
Hooke's Law governs elastic objects - they return to their original shape unless you've pushed them past their limit. The extension is proportional to the force applied, which is crucial for understanding springs and elastic materials.
Key Insight: Work done against friction always creates thermal energy, making objects heat up - that's why rubbing your hands together warms them up!
2
of 2
Motion, Newton's Laws, and Momentum
Speed tells you how fast something moves, but velocity includes direction too. Acceleration is the rate of change of velocity: a = Δv/t. Even objects moving in circles at constant speed are accelerating because their direction constantly changes.
Newton's three laws are your foundation: objects stay put or keep moving unless a force acts on them (1st), F = ma (2nd), and every action has an equal and opposite reaction (3rd). These explain everything from why you feel pushed back in an accelerating car to how rockets work.
Momentum is conserved in closed systems - the total before an event equals the total after. This principle explains collisions, explosions, and why jumping gives you a tiny push backwards.
When objects fall, they eventually reach terminal velocity when air resistance (drag) equals weight. Larger surface areas create more drag, which is why parachutes work so well.
Exam Tip: Remember that stopping distance = thinking distance + braking distance. Both increase with speed, and factors like drugs, alcohol, worn tyres, and wet roads make stopping even harder!
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Physics390 views·Updated May 12, 2026·2 pagesGCSE Combined Higher Physics Paper 2 Forces
R
ruby @rubymqy
Physics isn't just about memorising formulas - it's about understanding how forces shape everything around you, from why you don't float off the ground to how cars brake safely. This guide breaks down the essential concepts of forces, motion, and... Show more
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Forces and Vectors Fundamentals
Scalars have magnitude only (like speed), whilst vectors have both magnitude and direction (like velocity). Think of arrows - the longer the arrow, the bigger the vector's magnitude.
When dealing with objects, the centre of mass is where all the mass appears to be concentrated. For symmetrical shapes, it's right in the middle, but for irregular shapes, you'll need to use a plumb line to find it.
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2
of 2Sign up to see the content. It's free!
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Motion, Newton's Laws, and Momentum
Speed tells you how fast something moves, but velocity includes direction too. Acceleration is the rate of change of velocity: a = Δv/t. Even objects moving in circles at constant speed are accelerating because their direction constantly changes.
Newton's three laws are your foundation: objects stay put or keep moving unless a force acts on them (1st), F = ma (2nd), and every action has an equal and opposite reaction (3rd). These explain everything from why you feel pushed back in an accelerating car to how rockets work.
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