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Physics exam
GRADED A+ (ACTUAL EXAM ) Questions and Answers (Solved)
- vector vs scalar
Answer: direction and magnitude (displacement, velocity, weight/force) no direction (distance, speed, mass)
- max height
Answer: V2= 0
- speed, velocity, acceleration
Answer: speed = distance/time acceleration = change in velocity/time
velocity = change in distance/time
- what happens to acceleration/speed when an object is dropped
Answer: acceleration remains same (9.8) speed increases
- newtons laws
Answer:
1) object maintains constant velocity unless there is an unbalanced force 2) inertia (mass), more mass, more force to change it's motion 3) for every force there is an EQUAL and opposite force
- Fn
Answer: Normal force (perpendicular to surface)
Fn = 0 (apparent weightlessness, we feel weightless) mass doesn't change in space, weight changes
- surplus/deficit of electrons
Answer: -ve vs +ve charge can't have partial electrons
- / 2
- What moves to create charge?
Answer: electrons, losing or gaining
if a neutral body touches a positive body the neutral body loses electrons neutral/negative are attracted to positive
- positive/negative
north/south
Answer: out of positive into negative out of north into south
- ferromagnetic vs antiferromagnetic (paramagnetic)
Answer: same orientation (magnetic)
cancel out (not magnetic) whichever takes less energy is what occurs paramagnetic is random (alloy, like steel)
- domains
Answer: what makes something magnetic or not aligned randomly = not magnetic
aligned = magnetic to reduce or eliminate magnetism in a material you must screw up domains (heating, collision)
- moving charge.....
Answer: generates a magnetic field
13. HR 1: current in a wire
thumb: current (right), electron flow (left) fingers
Answer: generated magnetic field
- HR 3: moving charge in external magnetic field thumb: movement of charge
fingers: external magnetic field palm
Answer: force
- HR 2: solenoid thumb: NORTH
Fingers
Answer: current/electron flow in wire
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