Levers
Inclined Planes
Forces
Laws of Motion
Other Simple Machines
Physics
100
Explain how this 10Kg ball can lift a 25kg ball.
The lever is a simple machine which uses a pivet or fulcrum. It reduces the amount of force needed to lift an object.
100
Explain using physics why they made the moutain path curvy instead of straight.
To reduce the amount of work needed to go up the mountain. (less steep slope)
100
Explain how the shape of these objects reduce friction.
They use a wedge shape which reduces surface area.
(Push the wind over and under.)
100
Explain what is happening in this picture using the laws of physics.
An object in motion stays in motion unless acted upon it by an unbalanced force.
100
Does this pully reduce the amount of work needed?
No
100
Why would this gear system be necessary for trains to go up hills?
Train wheels and rails are smooth. This gear system allows trains to travel up steeper hills by locking the wheels into the tracks.
200
Does this lever make work easier (require less effort)? Explain.
Yes. The effort arm is longer than the load arm.
200
Which statement about inclined planes is NOT true?
a) Inclined planes reduce the amount of work needed.
b) Inclined planes must be straight and not curved.
c) A longer inclined plane reduces work more than a short one.
d) A ladder is a type of inclined plane.
b) Inclined planes must be straight and not curved.
200
What force is being shown in this picture?
Gravity
200
In which picture is it easier to move the box?
a, b, or neither - They both take the same amount of work.
neither - They both take the same amount of work.
200
Which wedge would do better at making work easier?
Wedge A: Distributes force along a greater distance.
200
Explain why person 2 falls faster than person 1 using physics.
More surface area, more air resistance (friction).
300
Which of these levers is more effective or effecient?
The 2nd or bottom lever (nutcracker). The load is closer to the fulcrum. The effort arm is much longer in the bottom picture.
300
At which location does the ball move the fastest down the inclined plane?
A, B, C, D or neither - they all move the same speed.
Location D
300
What two forces are acting on this snowman's sled?
Friction and gravity
300
In the pictures below, the man is...
a) pulling with more force when the rope is attached to the wall
b) pulling with more force when the rope is attached to the elephant
c) pulling with the same force in both pictures
c) pulling with the same force in both pictures
300
If one more pully were added, would it reduce the amount of work needed by a greater amount than the 4 pulleys?
No. Every other pully does not reduce the amount of work needed.
300
Look at these two slides. Give two reasons why the water slide reduces the amount of force needed more than the regular slide.
A) It is a longer inclined plane and trades distance for effort.
B) The water reduces friction.
400
Which letter represents the effort?
Does this lever reduce effort? 
B - No. The effort arm is short than the load arm. (The effort is between the load and the fulcrum.)
400
What are two problems these kids are not thinking about in moving their snowman up the ramp which makes their solution a poor choice?
Increase of the snowball's size as it is rolled up the ramp
The effort needed to make the ramp.
400
Which of these factors does not increase friction?
a) the mass of the objects rubbing together
b) the surface area of the objects together
c) the temperature of the objects rubbing together
d) the smoothness of the objects rubbing together
c) the temperature of the objects rubbing together
400
In the absence of air resistance, such as on the moon or in a vacuum, which falls faster?
elephant, mouse, neither: they fall at the same rate
neither: they fall at the same rate
400
Put the boxes in order from the hardest to easiest to move.
Box X (hardest) steepest slope
Box Z
Box Y (easiest) Least friction
400
Assuming the 2 barrals are the same size and mass and the ramp has the same slope, which job is easier? Give two reasons why.
2nd picture
Reasons:
less surface area
smoother surface (less friction)
500
Identify each part of this lever as fulcrum, effort, or load.
A = Fulcrum
B = Effort
C = Load
500
In this diagram, the balls in diagram move the slowest and the balls in diagram C move the fastest. Explain why.
The force is spread out over distance.
There is greater friction.
500
Give 3 ways you can reduce friction.
Add a liquid.
Make it smoother and less bumpy.
Add wheels or rollers.
Reduce surface area touching.
500
Put the trains in order from the least amount of acceleration to the greatest amount of acceleration.
D, B, C, A
500
Why would a Rube Goldberg machine not be considered a simple machine?
Because it doesn't make work easier but harder.
500
Give 3 ways this man can make his job easier using physics.
Lower the mass by removing the objects.
Reduce the amount of force needed by adding wheels.
Increase the amount of force by having a friend help push.