For my physics final we got a review sheet with statements on it. The statements are either true or false & we have to decide. Anybody out there who understands physics, could you please check the one's below and explain the others I'm unsure of?
Thank you SO much!
1.As a ball falls freely, the distance it falls each second is the same. (False)
2.The combination of all the forces that act on an object is called the net force (True)
3. The acceleration of an object is inversely proportional to the net force acting on the object (False)
4.The spped of an object dropped in air will continue to increase w/o limit until it strikes the ground(False)
5.If a bicycle and a parked car have a head on collision, the force of impact is greater on the bicycle (False)
6.A single vector can be replaced by two vectors in the X and Y directions. These X and Y vectors are called the resultant of the original vector
7. The force due to gravity acting on object is called the mass of the object.
2007-05-12 04:52:55 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
1.As a ball falls freely, the distance it falls each second is the same. (False) OK, the distance increases each second because the ball is accelerating.
2.The combination of all the forces that act on an object is called the net force (True) OK, the vector sum of all forces is the net force in f = ma.
3. The acceleration of an object is inversely proportional to the net force acting on the object (False) OK, f = ma; so acceleration is directly, not inversely, proportional.
4.The spped of an object dropped in air will continue to increase w/o limit until it strikes the ground(False) OK, eventually air drag forces (D) will equal the force of gravity (weight...W) and the net force f = W - D = 0 = ma; so a = 0 at that point.
5.If a bicycle and a parked car have a head on collision, the force of impact is greater on the bicycle (False) OK, when the klutz runs into a parked car, he and his bike will come to a sudden halt; during which time to force on car and bike/person will be equal and opposite.
6.A single vector can be replaced by two vectors in the X and Y directions. These X and Y vectors are called the resultant of the original vector (?) For reference, the resulting vector is the sum of two or more vectors. So, can X or Y be written as the sum of two or more vectors? (Hint: sum also means subtraction because we can add a negative value.)
7. The force due to gravity acting on object is called the mass of the object. (?) f = ma; so m = f/a; where m is the mass of an object acted on by a net force even if that force is the force of gravity, which is commonly called weight.
2007-05-12 05:47:06 · answer #1 · answered by oldprof 7 · 0⤊ 0⤋
#6. The X and Y vectors are called "component" vectors. Any vector in the X-Y plane, can be written as a sum of two component vectors. Component means "part", so every vector has an X part, and a Y part.
#7. The force due to gravity is called the "weight" of an object. Weight and mass are often interchanged, but they are very different. For instance, on earth, you weigh, say maybe 110 lbs (since you're a cutie). But on the moon, you would weigh much less. This is because the gravitational pull is weaker on the moon. Your mass is the same, but the force due to gravity is less, because "g" is smaller. Instead of F = ma, you would write, F = mg, (even though numberically a = g.)
2007-05-12 06:33:40 · answer #2 · answered by Robert T 4 · 0⤊ 0⤋
1) False is correct. The ball will accelerate due to gravity
2) Correct
3) Correct.
4) Correct. Air friction will limit the maximum speed of the object
5) Correct. The force of impact is equally distributed (providing that it is a DIRECT head-on collision)
6) True. However, if I recall my basic physics correctly, the single vector is the resultant, not the X and Y vectors
7) False. Mass is the measure of the amount of material in an object, and does not change. The measure of the force of gravity on an object is weight, and will change depending on the force of gravity exerted.
2007-05-12 05:00:54 · answer #3 · answered by Ron R 2 · 1⤊ 0⤋
1-5 are correct
6 & 7 are False
2007-05-12 04:58:37 · answer #4 · answered by cscokid77 3 · 0⤊ 0⤋
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2016-11-27 21:03:02 · answer #5 · answered by ? 4 · 0⤊ 0⤋