Physical Science

Question 1

What does a weight lifter that is holding bar bells above his head have to do in order to do work

Answer 1

Put it down

Question 2

The rate that work is done is called

Answer 2

Power

Question 3

The unit used for power is

Answer 3

Watts (w)

Question 4

Work and energy is measured in

Answer 4

Jules (J)

Question 5

A device that makes work easier is

Answer 5

A machine

Question 6

Amount by which a machine multiplies the effort force. ——– The ratio of resistance force to effort force

Answer 6

Mechanical advantage

Question 7

The force u apply to a machine

Answer 7

Effort (E)

Question 8

The force applied by the machine

Answer 8

Resistance (r)

Question 9

A machine that changes only the direction of the force has a mechanical advantage of

Answer 9

One

Question 10

A measure of how much work is put into a machine that is turned into useful works is

Answer 10

Efficiency

Question 11

Work output of a machine divided by the work input

Answer 11

Efficiency

Question 12

The work output of a machine is always —— than the work input of the machine

Answer 12

Less

Question 13

A device that does work with just one movement is

Answer 13

A simple machine

Question 14

A bar that is free to pivot about a fixed point

Answer 14

Lever

Question 15

A lever with a mechanical advantage greater than one is increase —-

Answer 15

Force

Question 16

A grooved wheel with a rope, chain, or cable running along the groove —–

Answer 16

Pullay

Question 17

A fixed pulley makes a block easier to lift by changing —– of the force needed to lift it

Answer 17

Direction

Question 18

Am arrangement of pulleys designed to reduce effort force is a

Answer 18

Black and pulley system

Question 19

A movable pulley —- the effort force

Answer 19

Decreased

Question 20

A simple machine consist of a shaft or axel attached to the center of a large wheel so they rotate together—

Answer 20

Wheel and axel

Question 21

A slanted surface used to raise an object

Answer 21

Inclined plane

Question 22

An inclines plane wrapped around a cylindrical post

Answer 22

Screw

Question 23

An inclined plane with one or two sloping sides

Answer 23

Wedges

Question 24

Two or more simple machines working together are

Answer 24

Complex

Question 25

—- is the transfer of energy that occurs when a force makes an object move in the direction of the force

Answer 25

Work