physics paper 2

Question 1

acceleration practical

Answer 1

• attach a toy car to a piece of string
• the string is looped around a pulley
• the other end of the string is attached to a 100g mass
• the weight of the mass will provide the force acting on the toy car
• draw chalk lines at equal intervals e.g. for every 10cm
• hold the toy car at the starting point
• let go of the car and start a timer
• record the time taken for the car to reach each interval
• repeat the experiment but decrease the mass each time
• transfer the mass from the end of the string to the top of the toy car
• this keeps the overall mass of the object the same
• as the mass of the toy car increases, the acceleration decreases

Question 2

problems with acceleration practical? how to improve

Answer 2

• if the car is moving rapidly, then it will be difficult to record an accurate time
• use a mobile phone so you can record it on your phone accurately

Question 3

ripple tank practical - measure the wavelength

Answer 3

• place a ruler on the paper
• freeze the image of the waves

Question 4

ripple tank practical - frequency

Answer 4

• place a timer next to the paper
• count the number of waves passing a point in one second
• maybe too difficult so count the number of waves in 10 seconds and then divide by 10

Question 5

how to measure waves in a solid

Answer 5

• have a string on one end attached to a vibration generator
• at the end of the string we have a hanging mass
• the mass keeps the string taut
• the vibration generator is attached to a signal generator
• the signal generator allows us to change the frequency of vibration of the string
• when we turn on the power the string vibrates
• this creates a standing wave which is due to resonance
• use a ruler to measure the standing wave from the wooden bridge to the vibration generator
• use this to calculate the speed of the wave using INSERT UKO