Work, power, energy, simple machines

Question 1

What is work?

Answer 1

Work is the force done on an object when the object moves in the same direction as the force exerted.

Question 2

What is the equation for work?

Answer 2

Work= forcexdistance

Question 3

What is the Si unit for work?

Answer 3

Joules

Question 4

What is power?

Answer 4

The amount of work done on the object in unit of time.

Question 5

How do you calculate power?

Answer 5

Power= work/time

Question 6

What is the Si unit for power?

Answer 6

Watt

Question 7

How do machines make work easier?

Answer 7

Changing the amount of force you exert, the distance over which you exert the force, or the direction in which you exert the force.

Question 8

What Is mechanical advantage?

Answer 8

The number of times a machine increases the force exerted on it.

Question 9

How do you calculate mechanical advantage?

Answer 9

Ma= output force/input force

Question 10

How do you calculate the effeciency of a machine?

Answer 10

Effeciency= output work/input work x 100%

Question 11

What are the 6 basic types of simple machines?

Answer 11

Screw, wheel and axle, wedge, inclined plane, pulley and axle.

Question 12

What changes the amount of pressure?

Answer 12

The area over which the force is distributed. As it increases, pressure decreases.

Question 13

How do you calculate pressure?

Answer 13

Pressure= force/area

Question 14

What happens to the atmospheric pressure as the elevation increases?

Answer 14

The pressure decreases.

Question 15

What happens to water pressure as depth increases?

Answer 15

Water pressure increases.

Question 16

What is bouyant force?

Answer 16

A force that acts in the opposite direction from the force of gravity, so it makes an object feel lighter.

Question 17

How do you calculate density?

Answer 17

Density= mass/volume

Question 18

What is density?

Answer 18

Density is the mass per units of volume of a substance.

Question 19

What is pascal’s priciple?

Answer 19

When force is applied to a confined fluid, the change in pressure is transmitted equally through all parts of the fluid.

Question 20

What is Bernoulli’s principle?

Answer 20

As the speed of moving fluid increases, the pressure within the fluid decreases.

Question 21

What is energy?

Answer 21

Energy is the ability to do work or cause change.

Question 22

How do you calculate energy?

Answer 22

Kinetic energy= 1/2x mass x volume

Gravitational potential energy= weight x height

Question 23

What are some of the main types of energy?

Answer 23

Mechanical, thermal, electrical, chemical, nuclear, and electromagnetic.

Question 24

What is the law of conservational energy?

Answer 24

The law that states that energy cannot be created or destroyed.