Which example represents a class 2 lever?
a car door being opened and shut*****
tweezers plucking hairs
salad tongs picking up salad
a screwdriver opening a paint can
Which statement best describes energy?
Energy is a push or pull on an object that will change the motion of the object.
Energy is the ability to do work.***
Energy is the force that causes movement in an object.
Energy is the power derived from the utilization of simple machines.
Which statement best describes work?
Work is the force that causes movement in an object.***
Work is a push or pull on an object that will change the motion of the object.
Work is the ability to exert energy.
Work is the power applied to simple machines.
A shovel performs several different functions. One of these is that it gives mechanical advantage as a lever. When does it act like a lever?
when the soil is lifted with the dirt at the end of the shovel and a lifting force at the handle
when the shovel is in the dirt and you push down against the end of the shovel, making it pivot***
when you step up onto the shovel with both feet to use your body weight
when you push the shovel downward into the dirt and a small force allows you to push down into the dirt easily
A person uses a screwdriver as a lever to open a can of paint. Where is the fulcrum in this situation?
the point where the screwdriver touches the rim of the can***
the point where the person pushes down on the screwdriver
the point where the person holds onto the can to keep it in place
the point where the end of the screwdriver lifts up the lid of the can
these are the answers i just took the quiz i got a 100%
Edit: Number three is
Work is done when a force causes an object to move.
Thanks Man!
Great job on getting a perfect score on your quiz! Here's an explanation for each question:
1. Which example represents a class 2 lever?
To determine the class of a lever, you need to understand its components. In a class 2 lever, the load is between the effort and the fulcrum. Among the given options, the car door being opened and shut represents a class 2 lever. When you open or shut a car door, your hand applies the effort (force) at the outer edge of the door (fulcrum) while the load (door's weight) is between your hand and the fulcrum.
2. Which statement best describes energy?
Energy is the ability to do work. Energy is not a push or pull on an object that causes motion, nor is it the force that causes movement in an object. While energy contributes to work, it is not the same as work itself. Energy can be derived from the utilization of simple machines, but that is not the best overall description.
3. Which statement best describes work?
Work is the force that causes movement in an object. This statement is not accurate. Work is actually defined as the product of force and displacement in the direction of the force. Work involves the application of force over a distance, resulting in the transfer of energy. It is related to, but not the same as, the force that causes movement.
4. A shovel performs several different functions. When does it act like a lever?
The shovel acts like a lever when it is in the dirt and you push down against the end of the shovel, making it pivot. This is an example of a class 1 lever, where the fulcrum (pivot) is between the effort (pushing down on the end of the shovel) and the load (the soil being lifted).
5. A person uses a screwdriver as a lever to open a can of paint. Where is the fulcrum in this situation?
The fulcrum in this situation is the point where the screwdriver touches the rim of the can. In a lever, the fulcrum is the point or axis around which a lever rotates or pivots. In this case, the screwdriver is acting as a lever, with the fulcrum being the contact point between the screwdriver and the rim of the can.
Again, great job on acing your quiz! Keep up the good work!