Chapter 14 Study Guide Flashcards
0
Q
- What is the formula for work?
A
W= FD
1
Q
- In order for work to be done on an object, an object has to _____ in the direction of the applied force.
A
Move
2
Q
- What do we measure work in?
A
Joules
3
Q
- A student uses a force of 60 N to lift a stack of books a distance of 4 m. How much work did (s)he do?
A
240 joules
4
Q
- A gardener uses a lever to lift a rock from the ground. The gardener applies a force of 50 newtons and moves the rock 1.5 meters. How much work is being done by the gardener?
A
75 N
5
Q
- What do we measure power in?
A
Watts
6
Q
- What is the formula for power?
A
P=W/T
7
Q
- A teacher uses 44 joules of work to move a stack of books in 4 seconds. How much power did she use?
A
11 Watts
8
Q
- A students uses a lever to apply a 20- newton force to a box while moving the box a distance of 0.5 meter. It takes the student 2 seconds to complete this. How much power did the student use while moving the box?
A
5 Watts
9
Q
- What is the force that you apply on the machine called?
A
Input Force
10
Q
- What is the force that machines applies on the object called?
A
Output force
11
Q
- The __ __ of a machine is the number of times that the machine increases the input force.
A
Mechanical Advantage
12
Q
- ___ ___ reduces the efficiency of a machine.
A
Friction
13
Q
- A __ __ is a machine that does work with not one movement, and makes work a lot easier.
A
Simple machine
14
Q
- A simple machine makes work easier by changing the size, direction, or ___ of the force
A
Distance
15
Q
- A ___ ___ is a machine made up of more than one simple machine.
A
Compound Machine
16
Q
- What simple machine is an incline plane that moves; it is usually used to separate of split things?
A
Wedge
17
Q
- What simple machine is an incline plane wrapped around a cylinder?
A
Screw
18
Q
- What simple machine consists of a rigid rod or plank that pivots or rotates about a fixed point called the fulcrum?
A
Lever
19
Q
- What simple machine is a made from two circular objects of different diameters that are attached and rotate together?
A
Wheel & Axle
20
Q
- What simple machine is a made from grooved wheel with a rope or cable wrapped around the groove?
A
Pulley
21
Q
- What simple machine is a flat, sloped surface?
A
Incline Plane
22
Q
- Give an example of a incline plane?
A
Ramp
23
Q
- Give an example of a wedge.
A
Axe
24
Q
- What is an example of a screw?
A
Meat grinder
25
Q
- Give a real world example of a lever.
A
Your arm
26
Q
- Give a real world example of a pulley.
A
Window blinds
27
Q
- What is an example of a wheel and axle?
A
Doorknob
28
Q
- A shovel is made up of two different simple machines. The blade of the shovel acts as one type of machine as it separates soil when it enters the ground. The handle of the hovel acts as a second/type of machine when the person using it lifts the soil. What two simple machines make up a shovel?
A
Lever and Wedge
29
Q
- A lever can be divided into three classes according to the position of their what?
A
Fulcrum
