WEIGHT IS MEASURED IN NEWTONS



WEIGHT IS MEASURED IN NEWTONS!

In the United States we measure weight in pounds. But in most countries, weight is measured in _____________ (hint: it’s the same unit used to measure mass in science).

But physical scientists measure weight in Newtons. Why? ______________________

______________________________________________________________________

Remember the definition of weight? Weight is really the measure of the force of gravity on an object’s mass. Gravity pulls all objects to Earth at a rate of 9.8m/sec2. Since F=ma (Newton’s Second Law), the mass of an object can be multiplied by the acceleration rate due to gravity. So that is why WEIGHT IS MEASURED IN NEWTONS!

In this lab you will measure some common things in Newtons.

I. Find 4 things to weigh on the grams scale. Weigh them, (we are really finding their mass) in grams, and then convert their mass to kilograms (divide grams by 1000 to get kilograms).

Write down your 4 objects and their mass here:

1. ____________________=______________kg

2.____________________ =______________kg

3. ____________________=______________kg

4. ____________________=______________kg

Now find your mass by weighing your self on the bathroom scale, or if you know your weight simply write it below.

Write down your weight (mass) in pounds here: ____________________________

Now convert your mass in pounds to kg. Multiply your mass in pounds by 0.37

Write your mass in kilograms here: __________________________________________

II. Now find the mass of 4 heavier objects. Hold something in your arms (a backpack for example), and find the combined mass in pounds by standing on the bathroom scale with that object. Convert that combined weight to kg. by multiplying by 0.37, then subtract your mass in kg. to find the mass of the object. Do this for all four objects.

Write down your 4 heavier objects and their masses here:

1. _____________________=______________kg

2. _____________________=______________kg

3. _____________________=______________kg

4. _____________________=______________kg

III. Now on the back of this paper, work out the Weight of each of the 8 objects you weighed by multiplying each object’s mass in kg x 9.8m/sec2. Don’t forget to record the weight of each object in Newtons!

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