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# Physics/FORCES AND MOTION - PROBLEM

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Question
1. A Car accelerates from rest at 2 m/s^2 for 8 seconds.
a) Draw a speed-time graph to show this motion.
b) use your graph to find
i) the final speed of the car
ii) the distance travelled by the car.

2. Can we calculate humans mass by the formula
"MASS = WEIGHT/GRAVITY". If we calculate our mass through this formula our mass changes when our weight changes. Then how can we say that mass will never change?

3. How Earth's gravity was created?

Answer
1a. The graph should be a straight, diagonal line with a y intercept of zero and a slope of 2m/s^2.
1b. Use the equation of the graph: Vf=a*t+Vo
1c. Calculate the area under the graph, a triangle, using 1/2*base*height= distance

2. Actually, your mass m is equal to the ratio of your weight W to the acceleration of gravity g: m=W/g . This ratio will be constant for a given mass m.

3. There are a number of different theories about how gravity works. One theory is that objects that exert gravitational force radiate "force particles" called gravitons that when intercepted by a mass results in a gravitational attraction.

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#### James J. Kovalcin

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I am teaching or have taught AP physics B and C [calculus based mechanics & electricity and magnetism] as well as Lab Physics for college bound students. I have a BS in Physics from the University of Pittsburgh and a Master of Arts in Teaching from same. I have been teaching physics for 34 years. I am constantly updating my skills and have a particular interest in modern physics topics.

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