1) The image below shows the final energy distributions for an experiment done on the Gizmo. What can be inferred from the graphs? (PICTURE OF GRAPHS IS ATTACHED) A. The two ramps were at the same angle. B. The two objects were the same shape. C. Both A and B are true. D. Neither A nor B is true. 2) One winter day Lisa and Mary have a contest to see who can find an object that will roll or slide down an icy hill in their neighborhood the fastest. Lisa picks a sled and Mary finds an old tire. They release their objects and the sled wins the race. If Mary wishes to propose a rematch, what conditions would most favor the tire? A. A race on a less steep, grassy hill B. A race on a steeper, grassy hill C. A race on a less steep, icy hill D. A race on a steeper, icy hill 3) Which would roll down a slanted desktop more quickly, a ballpoint pen full of ink or a ballpoint pen after it has run out of ink? (Note: Assume that the total mass of an object does not affect the rate at which it rolls.) A. The pen full of ink will always win the race. B. The empty pen will always win the race. C. The empty pen will win if the incline is steep, and the full pen will win if the incline is gentle. D. The full pen will win if the incline is steep, and the empty pen will win if the incline is gentle.
Kinematics
A machine is a device that accepts energy in some available form and utilizes it to do a type of work. Energy, work, or power has to be transferred from one mechanical part to another to run a machine. While the transfer of energy between two machine parts, those two parts experience a relative motion with each other. Studying such relative motions is termed kinematics.
Kinetic Energy and Work-Energy Theorem
In physics, work is the product of the net force in direction of the displacement and the magnitude of this displacement or it can also be defined as the energy transfer of an object when it is moved for a distance due to the forces acting on it in the direction of displacement and perpendicular to the displacement which is called the normal force. Energy is the capacity of any object doing work. The SI unit of work is joule and energy is Joule. This principle follows the second law of Newton's law of motion where the net force causes the acceleration of an object. The force of gravity which is downward force and the normal force acting on an object which is perpendicular to the object are equal in magnitude but opposite to the direction, so while determining the net force, these two components cancel out. The net force is the horizontal component of the force and in our explanation, we consider everything as frictionless surface since friction should also be calculated while called the work-energy component of the object. The two most basics of energy classification are potential energy and kinetic energy. There are various kinds of kinetic energy like chemical, mechanical, thermal, nuclear, electrical, radiant energy, and so on. The work is done when there is a change in energy and it mainly depends on the application of force and movement of the object. Let us say how much work is needed to lift a 5kg ball 5m high. Work is mathematically represented as Force ×Displacement. So it will be 5kg times the gravitational constant on earth and the distance moved by the object. Wnet=Fnet times Displacement.
1) The image below shows the final energy distributions for an experiment done on the Gizmo. What can be inferred from the graphs? (PICTURE OF GRAPHS IS ATTACHED)
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A. The two ramps were at the same angle.
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B. The two objects were the same shape.
-
C. Both A and B are true.
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D. Neither A nor B is true.
2) One winter day Lisa and Mary have a contest to see who can find an object that will roll or slide down an icy hill in their neighborhood the fastest. Lisa picks a sled and Mary finds an old tire. They release their objects and the sled wins the race. If Mary wishes to propose a rematch, what conditions would most favor the tire?
-
A. A race on a less steep, grassy hill
-
B. A race on a steeper, grassy hill
-
C. A race on a less steep, icy hill
-
D. A race on a steeper, icy hill
3) Which would roll down a slanted desktop more quickly, a ballpoint pen full of ink or a ballpoint pen after it has run out of ink? (Note: Assume that the total mass of an object does not affect the rate at which it rolls.)
-
A. The pen full of ink will always win the race.
-
B. The empty pen will always win the race.
-
C. The empty pen will win if the incline is steep, and the full pen will win if the incline is gentle.
-
D. The full pen will win if the incline is steep, and the empty pen will win if the incline is gentle.
4) A Frisbee is rolling smoothly down a hill with a rotational kinetic energy of 30 Joules. What is the most reasonable approximation for its translational kinetic energy?
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A. 25 Joules
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B. 45 Joules
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C. 65 Joules
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D. 85 Joules
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