Physics Questions & Answers

Physics Questions & Answers A boat moving at 4m/s north, with a wind coming from the east at 3 m/s gives you a net vector of what? - CORRECT ANSWER- 5m/s NE acceleration - CORRECT ANSWER- Change in velocity over change in time Acceleration - CORRECT ANSWER- The rate of change in velocity. Can be a change in direction, positive (speeding up) or negative (slowing down). Amplitude - CORRECT ANSWER- The maximum displacement of a point on the wave from this undisturbed position Balanced Force - CORRECT ANSWER- Two forces in opposite directions. Net force is zero and the motion of the object does not change. Change in momentum - CORRECT ANSWER- Equals massxchange in velocity. also equals impulse conservation of energy - CORRECT ANSWER- energy can not be lost or destroyed E=ke+pe conservation of energy - CORRECT ANSWER- Energy is neither created nor destroyed Conservation of energy principle - CORRECT ANSWER- The conservation of energy principle is that 'energy can be transferred usefully, stored or dissipated, nut can never be destroyed or created' Constructive interference - CORRECT ANSWER- Interference that causes a louder noise. Contact forces - CORRECT ANSWER- Contact forces work when two or more objects are touching. Some examples of this are: friction, air resistance, tension in ropes and normal contact force. When these two or more objects interact there is a force on both of them and is equal or opposite of the other object. Different types of energy - CORRECT ANSWER- Some different types of energy are: Thermal energy Kinetic energy Gravitational potential energy Elastic potential energy Chemical energy Magnetic energy