Simple machines and scientific investigations

Marco wants to investigate the acceleration of two different objects with the same surface area, but different masses when being dropped from a height.

What is his INDEPENDENT variable?,

• The difference in mass between the two objects.

• The difference in surface area between the two objects.

• The height the objects are dropped from.

• None of the above

Alex wants to investigate the effect of air resistance on water.

He intends to monitor the shape of water drops with a slow motion camera while changing the amount of force blown at each drop.

Which of the following is a CONTROLLED variable in his experiment?

• Size of the water drop

• Amount of air blow at each drop

• The distance the water drop travels based on the air resistance.

• The number of rotations of the fan blade.

Students tested whether moving a fulcrum closer and further away from the load, affects the force required to move the load. Their results are in the table. What CONCLUSIONS can they draw from their data?

• The greater the distance between the fulcrum and the load, the greater the mass required to move the load.

• The smaller the distance between the fulcrum and the load, the greater the mass required to move the load.

• The greater the distance between the fulcrum and the load, the smaller the mass required to move the load.

• None of the above

Students tested how changing the height of an inclined plane, changes the distance that a toy car will travel. Which science idea best explains their results?

• Energy can not be created or destroyed. It can only be transferred from one form to another.

• An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Students tested whether moving a fulcrum closer and further away from the load, affects the force required to move the load.
Which science idea below best explains the student's findings?

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Students tested how changing the height of an inclined plane, changes the distance that a toy car will travel. Which conclusion best suits their data?

• The greater the height, the greater the distance.

• The smaller the height, the greater the distance.

• The greater the height, the smaller the distance.

• None of the above

William wants to test if the age of a person determines the frequencies they can hear at. What is his DEPENDENT variable?

• The age of the participants in his experiment.

• The frequency at which each participant can hear.

• The number of students he test.

• The type of machinery that produces the frequency.

Priya wants to investigate whether increased friction will increase the force needed to move a toy car. Write a method (instructions) for how she can do this.

Make sure your method explains what you will test (independent variable), what you will measure (dependent variable) and what you will keep the same (controlled variables).

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What type of simple machine is this?

What type of simple machine is this?