Question

PLS HELP 100 POINTS!!!!!

Question 1 (1 point)
Saved
In which direction does an applied force move an object?

Question 1 options:

in the same direction as the force


independent of the force


in the opposite direction of the force


perpendicular to the force

Question 2 (1 point)
Which is not an example of work?

Question 2 options:

picking up a box off the floor


pushing a box across the floor


raising a barbell over your head


trying to push a rock that never moves

Question 3 (1 point)
A student pushes a 50-N box across the floor a distance of 15m. How much work was done to move the box?

Question 3 options:

750 J


75J


7500 J


no work was done

Question 4 (1 point)
If the simple machine reduces the amount of force, what must be increased? (Think of using an inclined plane)

Question 4 options:

the size of the simple machine


the distance over which the force is applied


the work the simple machine performs


the speed of the input force

Question 5 (1 point)
What is an input force?

Question 5 options:

the applied force on a system


the force a simple machine applies to an object


the force a person applies to a simple machine


the net force on a system

Question 6 (1 point)
A pair of scissors is which category of lever?

Question 6 options:

1st class


2nd class


3rd class


4th class

Question 7 (1 point)
A screw is an inclined plane wrapped around a flat, middle object.

Question 7 options:
True
False
Question 8 (1 point)
An example of a 3rd class lever is a

Question 8 options:

pair of scissors


pulley


pair of pliers


pair of tweezers

Question 9 (1 point)
Power is the rate at which work is done?

Question 9 options:
True
False
Question 10 (1 point)
The SI unit for power is

Question 10 options:

Newtons (N)


Celsius (C)


Watts (W)


Joules (J)

Question 11 (1 point)
A box resting on the top of a bookcase is an example of

Question 11 options:

work


nuclear energy


potential energy


kinetic energy

Question 12 (1 point)
The energy of position is kinetic energy.

Question 12 options:
True
False
Question 13 (1 point)
The energy of motion is kinetic energy.

Question 13 options:
True
False
Question 14 (1 point)
An object that is dropped has the most kinetic energy...

Question 14 options:

When it starts to fall


Just before it hits the ground


It does not have kinetic energy


Resting on the shelf

Question 15 (1 point)
An object resting on top of a building has the most potential energy...

Question 15 options:

Before it starts moving


When it stops moving


Just before it stops moving


Objects cannot have potential energy

Question 16 (6 points)
Match each word with its correct SI Unit or equation

Question 16 options:

Watts (W)


Newtons (N)


Displacement/Time


Celsius (C)


Distance/Time


Joules (J)

1.
Temperature

2.
Work

3.
Force

4.
Power

5.
Velocity

6.
Speed

Question 17 (1 point)
Atmosphere is the layer of gases that surround the Earth.

Question 17 options:
True
False
Question 18 (1 point)
The gas that makes up most of Earth's atmosphere is oxygen.

Question 18 options:
True
False
Question 19 (1 point)
High pressure brings clear, sunny skies, and calm weather. It is represented by H on the weather maps.

Question 19 options:
True
False
Question 20 (1 point)
Which clouds are fluffy, dense clouds composed of water droplets?

Question 20 options:

Stratus


Nimbus


Cirrus


Cumulus

Answer 1

Question 1: in the same direction as the force

Question 2: trying to push a rock that never moves

Question 3: 750 J

Question 4: the distance over which the force is applied

Question 5: The force a person applies to a simple machine

Question 6: 1st Class

Question 7: True

Question 8: pair of tweezers

Question 9: True

Question 10: Watts (W)

Question 11: potential energy

Question 12: False

Question 13: True

Question 14: When it starts to fall

Question 15: Before it starts moving

Question 16: Power and watts

/force and newton

/Work and Joules

/Temperature and Celsius

/Speed and distance/time

/Velocity and displacement an time

Question 17: True

Question 18: False

Question 19: True

Question 20: Cumulus

Explanation:

The force applied moves the object in the direction of the force. Suppose if the force is applied to the moving object in that case object moves in the direction of the stronger force. Thus, according to the given question the applied force moves the object in its direction

Work is when there is energy that is exerted throughout an object using force and action. Which displaces the measure of the force and the application of that specific action.

Given:

Force applied F = 50 N

Distance s = 15 m

Find:

Work done W

Computation:

Work done W = Force x distance

Work done W = 50 x 15

Work done W = 750 J

A Pair of tweezers is an example of a Third Class lever. The force is applied in the middle of the tweezers which causes a force at the tips of the tweezers. The fulcrum is where the two halves of the tweezers are joined together. Whereas a pair of scissors and a pair of pliers is an example of a first class lever.

Power is the rate of using energy or the rate of doing work. Basically, any units of energy (or work) and time can be used to generate a unit of power and can be computed as Work/time. Watt is the standard metric unit of power.

We can use a case scenario to illustrate what Power is. If you take a book and lift it a meter high, you will end up doing the same amount of work regardless of whether you lift the book slowly or quickly. However, you can increase your power which is the rate of doing work when you lift the book quickly.

Power (P) is the rate at which energy is transferred or converted. Thus, power equals work divided by time (P = W / t). The SI unit of power is the watt (W), in honor of Scottish inventor James Watt (1736 - 1819)

energy which a body possesses by virtue of being in motion is kinetic

Kinetic energy is when an object has the power to move, Potential energy would be when its resting on the shelf.

Earth is surrounded by invisible gases that form a thin protective blanket that we call the atmosphere. It contains the oxygen that we breath as well as other important gases such as nitrogen, carbon dioxide, water vapor, and ozone.

The permanent gases whose percentages do not change from day to day are nitrogen, oxygen and argon. Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%. Gases like carbon dioxide, nitrous oxides, methane, and ozone are trace gases that account for about a tenth of one percent of the atmosphere.

Weather maps show these areas using a large “H” to areas bring fair weather with clear skies, while Low pressure brings stormy weather and clouds.

Cumulus clouds look like fluffy, white cotton balls in the sky. They are beautiful in sunsets, and their varying sizes and shapes can make them fun to observe! Stratus cloud often look like thin, white sheets covering the whole sky.