BRAINCAKENewtons Laws of Motion
Revision notes for Newtons Laws of Motion in AQA Physics (7407). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- Newton's First Law of MotionAn object remains at rest or moves with constant velocity unless acted on by a resultant force.
- Investigating Force and MotionInvestigating the relationship between the resultant force and Motion can be done using a dynamics trolley and motion sensor connected to a computer.
- Newton's Second Law of MotionFor constant mass ΣF = m a The acceleration of an object is proportional to the resultant force ΣF acting on the object. ΣF α a By defining the…
- WeightW = m g W = weight (newtons) m = mass (kg) g = gravitational field strength On the Earth's surface the gravitational field strength g is 9.81ms-2…
- Resultant ForcesGiven two forces F1 and F2: F1 + F2 = m a where m = mass and a = acceleration.
- Sliding Down a SlopeThe forces acting on an object on a slope are the normal contact force N which is perpendicular the plane of the slope, the weight W of the object…
- Object Falling in a FluidAn object falling in fluid experiences an upward drag force due to fluid resistance and upthrust.
- Terminal SpeedAn object falling in fluid experiences an upward drag force due to fluid resistance and upthrust.
- Motion of a Powered VehicleAir resistance increases with speed.
- Stopping Distance" Stopping distance = thinking distance + braking distance When a car is moving it takes a certain amount of time to stop the car if an obstacle or…
- Thinking DistanceThe thinking distance is the distance travelled by the vehicle in the time it takes the driver to react.
- Braking DistanceThe braking distance is the distance the vehicle has travelled from the time the brakes are applied to the time it stops.
- Practical: Measuring FrictionFriction can be measured by placing a block on a table and pulling it with increasing force until it moves.
- Impact ForceAccording to Newtons second law the impact force during a collision is equal to the mass multiplied by the deceleration of the object F = m a The…
- Contact Time and Impact TimeThe contact time is the time for which two colliding objects are in contact with each other.
- Car SafetyMost of the safety features in a car increase the impact time and consequently reduce the impact force.