BRAINCAKEForces
Revision notes for Forces in AQA Combined Science: Trilogy (8464). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.
- Scalar and vector quantitiesPhysical quantities fall into two groups.
- Contact and non-contact forcesA force is a push or pull that acts on an object because of its interaction with another object.
- GravityWeight is the force acting on an object due to gravity.
- Resultant forcesSeveral forces can act on one object at the same time.
- Describing motion along a lineDistance is how far an object moves and has no direction, so it is a scalar quantity.
- Forces, accelerations and Newton's Laws of motionNewton's First Law says that if the resultant force on an object is zero, a stationary object stays stationary, and a moving object keeps moving at…
- Forces and brakingThe stopping distance of a vehicle is the thinking distance plus the braking distance.
- Momentum is a property of moving objectsEvery moving object has momentum.
- Conservation of momentumIn a closed system, no external forces act on the objects, so nothing outside the system adds or removes momentum.