Ch+4+Sec+5

Section 5
What do you see? Things weigh the same amounts but in different units. All scales work differently but have the same result.

What do you think? Yes, it wont be as precise. A bathroom scale works by measuring the force put on it, thus measuring your weight due to gravity.

Physics Talk Hooke's Law
 * it describes the restoring force a spring exerts
 * Hooke's Law: the restoring force exerted by a spring is directly proportional to the distance of stretch or compression of the spring
 * the more you stretch a spring, the larger the restoring force of the spring
 * force exerted by the string=spring constant X spring stretch
 * Fs=kx
 * Fs:y::k:slope
 * k: an indication of how easy or difficult it is to stretch or compress a spring
 * to find k you need to measure the force exerted by the spring and the stretch of the spring
 * it measures the stiffness of the spring
 * Mass and Weight
 * W=mg
 * Stretch and Compress
 * bathroom scales work by compressing a spring

Checking up 1. If the force on the spring increased five times, the stretch of the spring increases by five times 2. Spring constant measures the stiffness of the spring 3. Weight is dependent upon mass but mass isn't dependent on weight 4. The more you weigh, the more compressed the spring gets

PTG 1. a) w=100*9.8=980N b) w= 10*9.8=98N c)w= 60*9.8=588N

2. a) 500 N b) 4000 N c) 200 N

3. a) b) c) Slope=.1482 d) Slope=k e) This spring has a larger k which means it has less flexible spring

4. Fs=kx 12=k*3 4N/cm=k

5. As the force, so the stretch means that as the force on the spring (weight) increases so does the distance the spring is stretched

6. Spring with a constant of 15 N/cm

7. __0-3__= 3/2 N/cm 0-2

8. A spring scale works by compressing as weight is put onto it. The more weight you add, the more the spring compresses.