Physics Test 1 Flashcards
What does T stand for in the following formula: F = 1/T
T stands for period
What does P stand for in the following formula: p = mv
P stands for momentum
What is the definition of the period and how do you find it in a wave?
The period is the time taken for one wave to pass a point. To find it you measure the distance between two consecutive waves.
Where are rarefactions located?
Rarefactions are located in between two compressions.
What type of waves are seismic waves?
They are both since rock material is pushed and pulled (longitudinal)
And moved up or down , side to side (transverse)
what is the law of conservation of momentum?
Total p before = Total p after
Formula for stopping distance ?
stopping distance = thinking distance + breaking distance
What is reaction time?
Time between a person detecting stimuli and reacting
What affects reaction time?
reaction time is affected by drugs , distraction and alcohol
What affects breaking time?
Breaking distance is affected by Friction , brakes
When kinetic energy is transferred by the braking force (friction) it’s released through …. and …… . Fill in the missing words
Heat and Sound
What is the formula for Force?
mv - mu / t
What is Frequency and how do you find it?
Frequency is the number of waves passing each second. F = 1/T
How do you find the amplitude and in what units of length are they measured in?
To find the amplitude you measure the height of the wave from its resting point, measured in meters
What is the formula for Work done?
work done (J) = force (N) x Distance moved in the direction of the force (M)
What are two safety feature that modern cars use to help reduce the force on the occupants in a collision?
Crumble zone , Air bags
How do Crumble zones work?
The same force is spread out over a longer period, resulting in a smaller force acting on the vehicle and, consequently, the passengers.
What type of waves are sound waves?
Longitudinal
What is frequency measured in?
Hertz (Hz)
If we have a frequency of 1 hertz what does this mean?
A frequency of 1 hertz means 1 wave passing per second
How does frequency change Sound and Light waves?
For sound, the wave frequency determines the pitch(how high or low it sound) and for light the frequency determines the color.
How is wavelength measured and in what units of length?
The wavelength of a wave is the distance from a point on one wave to a point in the same position on the next wave , measure in meters.
How does change in the amplitude affect a sound wave?
The greater the amplitude of a sound wave, the louder is sounds
Tell me one way the velocity of a wave is affected?
Waves travel at different speeds in different materials
What is the equation that links frequency , wavelength and velocity?
Velocity (m/s) = frequency (Hz) x Wavelength(m)
What is the speed which light is always travelling at
300 000 000 m/s or 3x10 to the power of 8
