Paper 1 Physics Flashcards
Scalar Quantity
Only requires magnitude e.g Force and Weight
Velocity Defention
The speed of an object in a particular direction
Vector Quanatity
Magnitude and direction e.g Force and Velocity
Typical Speeds
Walking = 1.5 m/s Cycling = 7 m/s Running = 5m/s Car = 13 - 30 m/s
Weight definition
The force of gravity
Stopping distance equation
Thinking Distance + Braking Distance
Momentum Equation
Mass x Velocity
p = m x v
Efficiency Equation
Useful / Total x 100
Inertial mass definition
The measure of how difficult it is to change the velocity of an object
Newtons third law in collision
Equal Magnitude and opposite direction
Gravitational Potential Energy Equation
GPE = Mass x Gravity x Change in vertical height
Kinetic Energy Equation
1/2 x mass x velocity squared
Conservation of Energy Definition
Energy can be transferred usefully or stored
How can efficiency increase
Reducing wasted energy transfers
Frequency in a wave definition
Number of waves produced each second
Longitudinal waves and transverse waves difference
Longitudinal waves = Vibrations are parallel to the direction of the wave
Transverse waves = Vibrations are at right angles to the direction of the wave
Wave speed Equation 1
Frequency x Wavelength
Wave speed Equation 2
Distance/Time
Ultrasound Definition
Sound with frequency above 20,000Hz
Infrasound definition
Sound with frequency less than 20Hz
Depth calculation tip
Always divide final distance by 2 if wave has travelled twice
Uses of ultrasound
. Foetal Scanning
. Muscle and joint pain
Sound Waves in ear
Ear drum vibrates and loss of hair cells weakens the ability to hear higher frequencies
Why telescoped are outsides earths atmosphere
Clearer view of planets, stars and galaxies
Red shift definition
Space between the earth and the galaxy expanding
