64620
| Question | Answer |
| conservation of momentum | m1u1 +m2u2 = m1v1 + m2v2 |
| Newtons first law | Object at rest or moving in a straight line with constant velocity will continue that way unless acted upon by a force |
| Newtons second law | If force of F newtons is acting on object of mass mkg, and this causes acceleration of ams-2, then: F = MA |
| Acceleration and resultant on object moving with constant velocity? | No acceleration Resultant is zero |
| object of mass m has what weight? | weight = mg (g=9.8) |
| Newtons third law | If object A exerts a force on object B, then B exerts an equal and opposite force on A |
| Tension in string of two objects connected by light string over frictionless peg/pulley? | Same throughout! |
| Acceleration of object freefalling | -9.8ms-2 |
| Only force acting on particle | weight |
| Plane of projectile motion? | Vertical plane in shape of parabola |
| At time t, horizontal and vertical components of position of a particle projected at an inital velocity Ums-1 at angle * to horizontal (PROJECTILES) | x=Utcos* Y=Utsin* - 1/2gt(2) |
| At time t, the horizontal and vertical compnents of velocity of particle projected at inital velocity Ums-1 at angle of * to horizontal is given by: | Vx=Ucos* Vy=Usin*+gt |
| Maximum height of projectile? | Occurs at mid-point of path of projectile when vertical component of velocity is zero |
| At time t, a projectile released from heigh h above the ground is at the point where: | x=Utcos* y=Utsin* - 1/2gt(2) + h |
| SUVAT equations | v=u+at s=ut+1/2at(2) v=vt-1/2vt(2) s=1/2(u+v)t v(2)=u(2)=2as |
| Average speed | Total distance travelled/time taken |
| Avg velocity | Displacment from starting point/time taken |
| Gradient of displacement-time graph=? | VELOCITY |
| Gradient of velocity-time graph=? | ACCELERATION |
| Area under velocity-time graph | DISPLACMENT |
| Vector? How resolved? | Quantity that has both magnitude and direction. Into two components at right angles from each other, shown as column vector or in terms of unit vectors i and j. |
| Vector quantities? | Velocity, acceleration and displacement |
| Scalar quantities? | Speed and distance |
| Magnitude of displacment? Magnitude of velocity? | Distance Speed |
| Position vector, r | Starting vector + displacment |
| Avg velocity (vectors) | Change in position vector/time taken |
| How to find resultant velocity | Add seperate velocities or make velocity triangle |
| For constant acceleration, how to find? | change in velocity/time taken |
| Fcoc(Theta) | Beside angle |
| Fsin(theta) | Force opposite angle |
| Forces in equilibrium? | resultant is zero total component in any direction is zero |
| Assumptions of particle | No air resistance All forces act on same point Neligble mass |
| Friction equation | Fr=muR |
| Limiting equilibrium | Fr at maximum, object about to move |
| Fr equation when object in equilibrium but not limiting equilibrium | F < muR |
| Momentum type of quantity units | mass x velocity VECTOR kgms-1 |
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