Mechanical Systems

Question 1

What is the formula to calculate work?

Answer 1

Work = Force(N) x Distance(Metres)  
W= Fd

Question 2

What is work?

Answer 2

A force causing something to move over a certain distance and transferring energy.

Question 3

Define machine

Answer 3

A Mechanical system that reduces the force needed to do work/ makes things easier.

Question 4

What is the formula to calculate power?

Answer 4

Work (J)/ Time (seconds)
w/t
(watts)

Question 5

What is the formula to calculate mechanical advantage

Answer 5

Output force/ Input force

F out/ F in

Question 6

What’s energy?

Answer 6

The ability to do work

Question 7

What is friction?

Answer 7

Resistant of movement.

Question 8

What’s mass?

Answer 8

The amount of matter that something has

Question 9

What’s weight

Answer 9

It is the measure of the force of gravity on an object or body.

Question 10

What’s force?

Answer 10

A push or pull on an object.

Question 11

Force formula?

Answer 11

Fg = m x g

Mass (kg) x Gravitational field (9.8)

Question 12

What’s gravity?

Answer 12

Gravity is the force by which a planet or other body draws objects toward its center. (Attraction between 2 objects due to their mass)

Question 13

Laws of conservation of energy?

Answer 13

Energy can only be transferred or transform from 1 to another

U can’t create or destroy energy

Question 14

What’s power?

Answer 14

The rate at which work is done is referred to as power

Question 15

1. Kinetic vs. 2. Potential vs.3. Gravitational Potential Energy
   Definitions

Answer 15

1. energy of motion 2. stored energy

3. Gravitational potential energy is the energy stored in an object as the result of its vertical position or height.

Question 16

What’re the 6 simple machines?

Answer 16

Lever, pulley, inclined plane, screw, wedge, wheel & axle

Question 17

Lever & pulley definition ;examples

Answer 17

Lever: Rigid bar that’s supported at 1 point (rake, bottle opener, seesaw)

Pulley: grooved wheel w/ a rope or cable looped around it (Flag pole, pulling up blinds, elevator )

Question 18

Inclined plane & wedge ;examples

Answer 18

Inclined plane: sloping surface on which an object can move. (downhill road, slide, skateboard ramp)

Wedge: an inclined plane that travels through another material. (axe, knife, saw, teeth)

Question 19

Screw and wheel & axle; examples

Answer 19

Screw: Inclined plane wrapped around a rod (screw, cap on waterbottle)

Wheel & axle: Consists of a rod attached to a larger disk. (doorknobs, screwdriver, wheels)

Question 20

the 3 class levers.

Answer 20

1st class: Fulcrum in between the input and output forces, output force is opposite direction to input.

2nd class: output force in between the fulcrum and input forces, input and output face same direction.

3rd class: Input force in between the fulcrum and output force, input and output face same direction

Question 21

Ideal mechanical advantage (IMA) formula

Answer 21

Ideal mechanical advantage:
length of input arm/ length of output arm

IMA = L in/ L out

Question 22

Different pulleys?

Answer 22

Fixed pulleys: change only the direction of the force & has an IMA of 1

Movable pulley: 1 end of the rope is fixed & the pulley is allowed to move.

Question 23

Mechanism, Mechanical system?

Answer 23

Mechanism: 2 or more simple machines working together

Mechanical system: a group of physical parts that interact w/ each other & function as a whole to complete a task

Question 24

how simple machines make things easier?

Answer 24

increase force, distance, and change direction

Question 25

3 laws of motion

Answer 25

1. Intertia, moving objects don’t spontaneously speed up, slow down, or change direction.
2. greater the mass, the greater the speed/force
   Force = mass x acceleration
3. for every action there’s an equal and opposite reaction