A. Read the the question carefully. Chose the correct answer from the words inside the box. Write your answer in the provided blank spaces before the number
Push
Elastic force
Force
Pull
Energy
______1. A push or pull both
______2. The ability to do work
______3. To move an object towards our bodies.
______4. To move an object away from our bodies
______5. Materials that return to their original shape and size after force is applied.
B. List 2 objects that change temporarily and 3 objects that change permanently when you applied force to them.
Change Temporarily
1.
2.
3.
Change permanently
1.
2.
3.
Push
Elastic force
Force
Pull
Energy
______1. A push or pull both
______2. The ability to do work
______3. To move an object towards our bodies.
______4. To move an object away from our bodies
______5. Materials that return to their original shape and size after force is applied.
B. List 2 objects that change temporarily and 3 objects that change permanently when you applied force to them.
Change Temporarily
1.
2.
3.
Change permanently
1.
2.
3.
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Answers & Comments
Answer:
Answer: ACDHIKNO
a. TRUE - Work is a form of energy, and in fact it has units of energy.
b. FALSE - Watt is the standard metric unit of power; Joule is the standard metric unit of energy.
c. TRUE - A N•m is equal to a Joule.
d. TRUE - A kg•m2/s2 is a mass unit times a speed squared unit, making it a kinetic energy unit and equivalent to a Joule.
e. FALSE - Work is not dependent on how rapidly the force displaces an object; power is time-based and calculated by force multiplied by speed.
f. FALSE - Since Superman does not cause a displacement, no work is done; he is merely holding the car to prevent its descent down the hill.
g. FALSE - The upward force does not cause the horizontal displacement so this is a NON-example of work.
h. TRUE - There is a component of force in the direction of displacement and so this is an example of work.
i. TRUE - There is a force and a displacement; the force acts in the opposite direction as the displacement and so this force does negative work.
j. FALSE - For uniform circular motion, the force acts perpendicular to the direction of the motion and so the force never does any work upon the object.
k. FALSE - This is clearly work - a force is causing an object to be displaced.
l. FALSE - If a force acts at a 90-degree angle to the direction of motion, then the force does not do any work at all. Negative work is done when there is a component of force opposite the direction of motion.
m. FALSE - There are many instances in which an individual force does positive work and yet the object maintains a constant speed. Consider a force applied to lift an object at constant speed. The force does positive work. Consider a car moving at constant speed along a level surface. The force of the road on the tires does positive work while air resistance does and equal amount of negative work.
n. TRUE - A force which acts in a direction opposite the motion of an object will do negative work.
o. TRUE - When non-conservative forces do work upon an object, the object will either gain or lose mechanical energy. Mechanical energy is conserved (neither gained nor lost) only when conservative forces do work upon objects.
Answer:
1.programs
2.gently
3.Change and changes the shape