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Category 4

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Category 5

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Category 1 questions follow

Questio

nAt what point will the car

have the most kinetic energy?

a. A

b. B

c. C

d. D

10Category 1

Answ

er

. At what point will

the car have the most

kinetic energy?

a. A

b. B

c. C

d. D

10Category 1

Remember; KE is energy of motion!

The total energy is conserved, so when

PE is the lowest, KE is the highest or It

has had the most time to fall

Questio

nAt what point is the cart moving the slowest?

20Category 1

Answ

er

At what point is the cart moving the slowest?

The minimum speed occurs near the top of the incline

20Category 1

Questio

nIf G is twice as high as E, then G has

a. 2 X the energy

b. ½ the energy

c. 4 X the energy

30Category 1

Answ

er

If G is twice as high as E, then G has

a. 2 X the energy

b. ½ the energy

c. 4 X the energy

30Category 1

Questio

nThe greatest potential energy is at

a. A

b. B

c. C

d. D

e. E

40Category 1

Answ

er

The greatest potential

energy is at

a. A

b. B

c. C

d. D

e. E

40Category 1

Greatest gravitational potential energy at greatest height

It is also slowest at this point

Questio

nIf the plumb has 10 joules

when it is straight out, what

is the kinetic energy when it

is hanging straight down?

50Category 1

Answ

er

If the plumb has 10 joules when it

is straight out, what is the kinetic

energy when it is hanging straight

down?

The change in potential energy =

Kinetic energy so when PE = 0,

then KE = 10

50Category 1


Questio

nAfter the sling shot is released, the

kinetic energy in the band has been

converted into ___________

10Category 2

Answ

er

After the sling shot is released, the

kinetic energy in the band has been

converted into HEAT__

10Category 2

Questio

nDescribe the result if the

ball has a greater mass

than the cannon

20

Answ

er

Describe the result if the

ball has a greater mass than

the cannon

20Category 2

The cannon will have a greater velocity backwards

and you would be in more danger than anyone in

front of the cannon

Questio

nWhich would need to have a stronger dam to hold back

the force of water, a deep pond or a shallow pond with

10 X the amount of water?

30Category 2

Answ

er

Which would need to have a stronger dam to hold back

the force of water, a deep pond or a shallow pond with

10 X the amount of water?

The deeper the pond, the greater height & greater force

30Category 2

Questio

nIf you are building a roller coaster, at what points

would you need a motor, and not gravity to produce

motion?

40Category 2

Answ

er

If you are building a roller coaster, at what points would

you need a motor, and not gravity to produce motion?

Only to get them to the top of the first, tallest hill

40Category 2

Questio

nAccording to the Conservation of

energy, the potential energy is

converted to mechanical energy of

motion. Part of this energy is lost as

_____

50Category 2

Answ

er

According to the Conservation of

energy, the potential energy is

converted to mechanical energy of

motion. Part of this energy is lost as

_____HEAT into environment or in

the machinery

50Category 2


Questio

nWork = F X D

If the horse moves 1000

kg a distance of 10

meters, _________

amount of work is done.

10Category 3

Answ

er

Work = F X D

If the horse moves

1000 kg a distance of

10 meters, _________

amount of work is

done.

10Category 3

Work = F X D

Work = 10 000 N X 10 m

Work = 100 000 N-M

Work = 100 000 J

Force = mass X gravity

Force = 1000 kg X 10 m/s2

F = 10 000 Kg-m/s2

Force = 10 000 N

Questio

nDoes the boy do work on

the tree?

20Category 3

Answ

er

Does the boy do work on

the tree?

For ever action there is an

equal and opposite reaction.

If the tree does not move,

there is no work. He boy

does no work

20Category 3

Questio

nHow much work is

done?

a. Depends on how

hard he pushes

b. No work

30Category 3

Answ

er

How much work is done?

a. Depends on how hard he pushes

b. No work

If it doesn’t move, there is no work

30Category 3

Questio

nThe slingshot shoots a marble forward. Compare the

velocity and momentum of both the slingshot and the

marble

40Category 3

Answ

er

The slingshot shoots a marble forward. Compare the

velocity and momentum of both the slingshot and the

marble

The momentum would be the same for both

P = mv, so the slingshot mv = mv of marble

But the mass of the marble is smaller than the slingshot,

so it would move many times faster than the slingshot

40Category 3

Questio

nWhat is the significance of

the direction of the force

arrow?

50Category 3

Answ

er

What is the significance of the direction of the force arrow?When you’re pulling at an angle, you’re not applying a force in the exact same direction as the direction of motion. More force is required to do the same amount of work if you pull at a larger angle.To find the work in this case, you find the component of the force along the direction of motion.

50Category 3

Work properly defined is the force along the direction of displacement multiplied by the magnitude of the displacement


Questio

nWhat is the IMA of the 2 pulleys?

10Category 4

Answ

er

What is the IMA of the 2 pulleys?

a. Left is 1

b. Right is 2

10Category 4

Questio

nIf a 1 kg apple falls 10 meters

from a tree, the apple would

hit with a force of

__________

20Category 4

F = maWt = mg

Answ

er

If a 1 kg apple falls 10 meters

from a tree, the apple would

hit with a force of

__________

Force = m X a

Force = 1 kg X 10 m/s2

Force = 10 kg-m/s2 = 10 N

20Category 4

F = maWt = mg

Questio

nIf the output force is 100 kg, then

the input could be ___________

30Category 4

Answ

er

If the output force is 100 kg, then

the input could be ___________

The input can be higher, but not lower

than 100 kg.

There is no 100% efficient machine!

30Category 4

Questio

nA level may allow you to lift a

mass that is too large for you

to normally lift, but it is at the

expense of __________

40Category 4

Answ

er

A level may allow you to lift a

mass that is too large for you

to normally lift, but it is at the

expense of __________

Distance

Work = Force X distance

40Category 4

Questio

nWhat is the power needed to raise 6 Newtons over a

distance of 6 meters in 10 seconds?

50Category 4

Answ

er

Power = force X distance divided by time

What is the power needed to raise 6 Newtons (force) over a

distance of 6 meters in 10 seconds?

a. Power = 6 N X 6 m = 36 N-m/10 sec = 3.6 N-m/s = 3.6 W

10 sec

50Category 4


Questio

n Work = Force X Distance

Power = work/time

On day 1 a Girl walks 1 mile in 20 minutes.

On day 2 a Girl walks 2 miles in 20 minutes

a. She used twice the power on day 2

b. She did twice the work on day 2

c. Both a and b are correct

10Category 5

Answ

er

Work = Force X Distance

Power = work/time

On day 1 a Girl walks 1 mile in 20 minutes.

On day 2 a Girl walks 2 miles in 20 minutes

a. She used twice the power on day 2

b. She did twice the work on day 2

c. Both a and b are correct

10Category 5

Questio

n Work = Force X Distance

If you push 4 times as far, using the same force the

work is ___________as much

a. 4 times

b. ½

c. 8 Times

20Category 5

Answ

er

Work = Force X Distance

If you push 4 times as far, using the same force the

work is ___________as much

a. 4 times

b. ½

c. 8 Times

20Category 5

Questio

nWhich of the simple machines above could be used to

move something with less force?

30Category 5

Answ

er

Which of the simple machines above could be used to

move something with less force?

All of these follow the W = F X D

30Category 5

Questio

nTo apply the least amount of force to move an object,

you would need to ________________

40Category 5

Answ

er

To apply the least amount of force to move an

object, you would need to ________________

Apply the force in the exact direction as the

motion desired

40Category 5

Questio

nHow could you determine the

kinetic energy of a 300 kg

satellite moving at 300 m/2?

50Category 5

Answ

er

How could you determine the kinetic

energy of a 300 kg satellite moving at

300 m/s? KE = ½ mv2

KE = ½ (300 kg) (300 m/s) 2

KE = 150 ( 90 000) KE = 13 500 000 kg-m/s2 KE = 13 500 000 J

50Category 5

Documents

Category 1