Test Pârghii

1. Un om ridică un dulap cu masa de 200 kg la înălțimea de 5 metri folosind un scripete fix. Calculează forța cu care trebuie să acționeze omul.

R=m*g R=200kg*10N/kg=2000NF=R, F=2000N

F=R/2 F=1000N

The correct answer is F=2000N. The force with which the person needs to act is equal to the weight of the object being lifted, which is calculated as the mass of the object multiplied by the acceleration due to gravity. In this case, the mass of the object is 200 kg and the acceleration due to gravity is 10 N/kg, resulting in a force of 2000N.

Explanation

The correct answer is F=2000N. The force with which the person needs to act is equal to the weight of the object being lifted, which is calculated as the mass of the object multiplied by the acceleration due to gravity. In this case, the mass of the object is 200 kg and the acceleration due to gravity is 10 N/kg, resulting in a force of 2000N.

2. Identifică pârgiile de tipul 2

roaba

cleștele de spart nuci

ciocanul

ranga

The correct answer is "roaba". This is because the other options listed (cleștele de spart nuci, ciocanul, ranga) are not types of pârgii (levers), but rather different tools. A "roaba" is a type of lever commonly used for transporting heavy loads, making it the correct answer.

Explanation

The correct answer is "roaba". This is because the other options listed (cleștele de spart nuci, ciocanul, ranga) are not types of pârgii (levers), but rather different tools. A "roaba" is a type of lever commonly used for transporting heavy loads, making it the correct answer.

3. Folosind o rangă brațul forței active este mai mic decât brațul forței rezistente

True

False

The statement is saying that the active force arm is smaller than the resistant force arm. This is false because in a lever system, the force arm is the perpendicular distance between the line of action of the force and the fulcrum. The active force arm is the distance from the point where the input force is applied to the fulcrum, while the resistant force arm is the distance from the point where the output force is applied to the fulcrum. In a mechanical advantage system, the active force arm is typically longer than the resistant force arm, allowing for a greater output force compared to the input force.

Explanation

The statement is saying that the active force arm is smaller than the resistant force arm. This is false because in a lever system, the force arm is the perpendicular distance between the line of action of the force and the fulcrum. The active force arm is the distance from the point where the input force is applied to the fulcrum, while the resistant force arm is the distance from the point where the output force is applied to the fulcrum. In a mechanical advantage system, the active force arm is typically longer than the resistant force arm, allowing for a greater output force compared to the input force.

4. Ranga este o parghie de tipul .................... Creionul este o pârghie de tipul ..................... Deplasarea forței active în cazul creionului este mai ............................. decât deplasarea forței rezistente.

The given answer states that "Ranga este o pârghie de tipul 1" which means that Ranga is a lever of type 1. It also states that "Creionul este o pârghie de tipul 3" which means that the pencil is a lever of type 3. Finally, it states that "deplasarea forței active în cazul creionului este mai mică decât deplasarea forței rezistente" which means that the displacement of the active force in the case of the pencil is smaller than the displacement of the resistant force.

Explanation

The given answer states that "Ranga este o pârghie de tipul 1" which means that Ranga is a lever of type 1. It also states that "Creionul este o pârghie de tipul 3" which means that the pencil is a lever of type 3. Finally, it states that "deplasarea forței active în cazul creionului este mai mică decât deplasarea forței rezistente" which means that the displacement of the active force in the case of the pencil is smaller than the displacement of the resistant force.

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