Newton Meters D. Crowley, 2007

Newton Meters To understand how a Newton Meter works Friday, August 21, 2015

Speed Recap Questions What is my speed if I run 100m in 11 seconds? What is my speed if I run 100m in 8 seconds? How far have I run if I travel at 50m/s for 20 seconds How long did it take me to cover 700m if I ran at 3m/s What is my speed if I run 7000m in 30 minutes? Recap Questions What is my speed if I run 100m in 11 seconds? What is my speed if I run 100m in 8 seconds? How far have I run if I travel at 50m/s for 20 seconds How long did it take me to cover 700m if I ran at 3m/s What is my speed if I run 7000m in 30 minutes? Speed Distance Time

Speed Recap Questions What is my speed if I run 100m in 11 seconds? Speed = 100 / 11 = 9.09m/s What is my speed if I run 100m in 8 seconds? Speed = 100 / 8 = 12.5m/s How far have I run if I travel at 50m/s for 20 seconds Distance = 50 x 20 =1000m (1km) How long did it take me to cover 700m if I ran at 3m/s Time = 700 / 3 = seconds What is my speed if I run 7000m in 30 minutes? Speed = 7000 / 1800 = 3.89m/s Recap Questions What is my speed if I run 100m in 11 seconds? Speed = 100 / 11 = 9.09m/s What is my speed if I run 100m in 8 seconds? Speed = 100 / 8 = 12.5m/s How far have I run if I travel at 50m/s for 20 seconds Distance = 50 x 20 =1000m (1km) How long did it take me to cover 700m if I ran at 3m/s Time = 700 / 3 = seconds What is my speed if I run 7000m in 30 minutes? Speed = 7000 / 1800 = 3.89m/s Speed Distance Time

Newton Meters Look at the different Newton Meters we have What are they doing? How are they working? Look at the different Newton Meters we have What are they doing? How are they working?

Newton Meter A Newton Meter is a device which can measure the force of an object It works by hanging an object at one end. Gravity pulls this object down, and it stretches a spring. The more the spring has stretched, the greater the force pulling down on it was We can see how much force there was by reading the gauge - measured in our force unit, Newtons (N) A Newton Meter is a device which can measure the force of an object It works by hanging an object at one end. Gravity pulls this object down, and it stretches a spring. The more the spring has stretched, the greater the force pulling down on it was We can see how much force there was by reading the gauge - measured in our force unit, Newtons (N)

Experiment We are going to make our own Newton Meter today They work by suspending an object on the hook which causes a spring to stretch First of all we must complete a risk assessment form - what are the main risks involved with carrying out this experiment? We are going to make our own Newton Meter today They work by suspending an object on the hook which causes a spring to stretch First of all we must complete a risk assessment form - what are the main risks involved with carrying out this experiment?

Results Before we set up the equipment, we need to produce a table of results Mass (g)Weight (N)Length of spring (cm) Note: mass and weight are very different. The mass is the amount of stuff there is (g). The weight is the amount of stuff multiplied by the force of gravity pulling it down (N)

Experiment You will need: 1x stand; 2x clamps; 1x spring; 1x meter ruler; 1x mass holder + masses Set up your equipment as in the diagram. Measure the length of the spring without anything attached to it…

Experiment Now you need to add a 100g mass and record the new length of the spring (note: the mass holder weighs 100g, so this is your first mass record) Continue adding more mass, but stop at a total of 700g as this will stretch the spring too much Now you need to add a 100g mass and record the new length of the spring (note: the mass holder weighs 100g, so this is your first mass record) Continue adding more mass, but stop at a total of 700g as this will stretch the spring too much Measure the bottom of the spring

Graph & Results Now you have your results, you need to produce a line graph - think about what goes on the bottom of the graph (what did you change) Produce a line of best fit, add a title and units to your graph Were there any anomalies? Why do you think this is? Then write up your results - what did you find? Was the experiment a success - could you improve the experiment? Now you have your results, you need to produce a line graph - think about what goes on the bottom of the graph (what did you change) Produce a line of best fit, add a title and units to your graph Were there any anomalies? Why do you think this is? Then write up your results - what did you find? Was the experiment a success - could you improve the experiment?