100 100 100 100 100 100

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400 400 400 400 400 400

500 500 500 500 500 500

By Any Name

Work It Out Little Help Here

Forcing the Issue K.I.S.S.

Strong Arm Tactics

What must happen in order for a person to do work?

A 100

1)A force must be applied to the object

2)The object must move

3)The object must move in the direction of the force

A 100

Which of the following is an example of work: reading this question, thinking about the answer, pushing the egg, or

speaking the answer?

A 200

Pushing the Egg

A 200

Why is carrying a bag of groceries into the

house not considered work?

A 300

Because the direction of the force you apply to the bag is not the same as the direction

the bag is moving

A 300

What is the formula for work?

A 400

Work = force x distance

A 400

1)A student spins the dial on her locker, then

2)pulls up on the latch to open the locker.

3)the student pulls out her science book, and

4)places it on the ground.

In which step(s) above does the student do work? Explain your

answer. A 500

The student does work when spinning the dial, pulling up on the latch, and picking up the book, because the student

applied a force which caused the object to move in the

direction of the force.

A 500

How much work was done in the above sitation?

B 100

5 N x .1 m = .5 Joules

B 100

How much work was done in the above situation? Explain

your answer.

B 200

Since none of the students are moving, there is no work

being done in the classroom

B 200

Mechanical Advantage compares which two

things?

B 300

Mechanical Advantage compares the input force

applied to the machine and the output force applied by

the machine.

B 300

What is the mechanical advantage of a machine that multiplies the input force: <1,

=1, or >1?

B 400

The mechanical advantage of a machine that multiplies

the input force is greater than 1 (>1)

B 400

Name two simple machines that would multiply the input force.

B 500

Inclined planes, wedges, screws, 2nd class levers,

some wheel and axles, and pulley systems all multiply

the input force

B 500

Any device that makes work easier or more efficient is

called what?

C 100

A machine

C 100

Name two of the three ways machines can make work easier or more efficient.

C 200

1)The machine can multiply input force.

2)The machine can multiply input distance.

3)The machine can change the direction of the input force.

C 200

How does using a machine affect the amount of work a

person needs to do?

C 300

It does not change the amount of work the person

needs to do. Using a machine does not affect

the amount of work done.

C 300

DAILY DOUBLE

C 400

DAILY DOUBLEPlace A Wager

What is the ideal efficiency of a machine?

C 400

Ideal mechanical efficiency is 100 %.

C 400

What happens to efficiency when friction increases?

C 500

As friction increases, efficiency decreases.

C 500

Which pair of objects would be more strongly attracted due to gravity? Explain your answer.

D 100

Because the objects in pair A appear to have more mass, they will have a stronger attraction die

to gravity, according to the universal law of gravitation.

D 100

What could you do to the objects in pair B so they have the same

gravitational pull as the objects in pair A?

D 200

The objects in pair B should be moved closer together, which

would increase their gravitational pull.

D 200

If they were dropped at the same time, which would fall

the fastest: a piano, a bowling ball, or a person?

D 300

All three objects would fall at the same rate, since their attraction to Earth is the

same.

D 300

D 400

What could you do to increase the amount of friction in a

situation?

D 400

Make surfaces rougher, increase speed, increase

pressure, remove wheels, etc.

D 500

Why does a person skydiving fall slower once

they open their parachute?

D 500

Opening the parachute increases the air resistance (friction) of the person, and the increased friction is able to balance gravity at a lower

speed.

Which simple machine does the above best

represent?

E 100

A slide is an example of an inclined plane.

E 100

What is the axle in the above machine?

E 200

The handle in the middle is the axle.

E 200

E 300

What simple machine is best represented by the

diagram above?

E 300

The base of the light bulb is an example of a

screw

E 400

What are wedges typically used for?

E 400

Separating objects or holding objects

together

An inclined plane allows you to apply less force to lift an object. What is the

disadvantage of an inclined plane?

E 500

You must apply the force over a greater

distance.

E 500

Which of the levers above are 1st class levers?

F 100

The see-saw, hammer, and the scissors are all

1st class levers?

F 100

F 200

Which of the levers above are 2nd class levers?

The nutcracker and wheelbarrow are 2nd

class levers

F 200

F 300

Which of the levers above are 3rd class levers?

The shovel and ping pong paddle are 3rd

class levers

F 300

F 400

Give three examples of 2nd class levers from this

classroom.

The doorknobs, the front and back doors, the cabinet

doors, the front of a binder, the 3 hole punch, etc.

F 400

F 500

When you use a spoon to eat, which class of lever is it? What

is the fulcrum?

When using a spoon to eat, you are using a 3rd class lever. The fulcrum of the lever is your wrist (or elbow).

F 500

The Final Jeopardy Category is:

Compound Machines

Please record your wager.

Click on screen to begin

Name one example of each simple machines, and two classes of levers, from the

situation above.

Click on screen to continue

Inclined Plane – the hillWedge – the helmets

Screw – screws on the bike1st class lever – bike handlebars3rd class lever – bikers’ arms and

legsWheel and Axle – back tire of bike,

bike pedalPulley – bike chain

Click on screen to continue

Thank You for Playing Jeopardy!

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