Physics Semester 1 Questions & Answers

Physics Semester 1 Questions & Answers 1st Law of Motion - CORRECT ANSWER- an object in motion will stay in motion, unless there is a force acts on it 2nd Law of Motion - CORRECT ANSWER- Force = mass x acceleration 3rd Law of Motion - CORRECT ANSWER- for every action, there is an equal and opposite reaction Absolute 0 - Kelvin Scale - CORRECT ANSWER- Absolute 0 - atoms have as little kinetic energy as possible Absolute 0 = -273°C 50 Kelvin = -223°C 15°C = 288 Kelvin Acceleration - CORRECT ANSWER- the rate at which the velocity is changing. Acceleration = - CORRECT ANSWER- Change in Velocity / Time Taken area - CORRECT ANSWER- the amount of space inside a something Average Speed - CORRECT ANSWER- total distance/total time Average Speed = - CORRECT ANSWER- distance / time Centripetal Force - CORRECT ANSWER- a center directed force that causes an object to move in a curved path Components - CORRECT ANSWER- two vectors at right angles that add up to the given vector Conduction - CORRECT ANSWER- Process where vibrating particles pass on their kinetic energy Constant Velocity - CORRECT ANSWER- the object's net force is equal to zero (could be moving or could not be moving) Convection - CORRECT ANSWER- Particles from their hotter region to the cooler region and take their heat energy with them Dangers of Microwaves - CORRECT ANSWER- Yeah human body tissue internally Density = - CORRECT ANSWER- Mass / Volume Effects of gravity on planets - CORRECT ANSWER- Closer you get to a star or a planet the stronger the force of attraction is, so they move quicker in orbit