5.6D Experimenting with Force 3

When designing a simple experimental investigation that tests the effect of force on an object, why is it important to test one variable at a time?

• It would be impossible to test two variables during an experiment involving force.

• It allows the experimenter to correctly and more easily interpret the results of the experiment.

• It allows the experimenter to formulate a hypothesis both before and after the experiment.

• It is not important to test only one variable at a time.

The cyclist in the picture below is riding up and over a large hill at a constant speed.

In which position is the cyclist using the most force to make the bicycle move?

• Position 1

• Position 2

• Position 3

• Position 4

Tags

NGSS.MS-PS2-2

The cyclist in position 4 stops pedaling, but continues to roll down the hill. Which force is pulling the bicycle and rider down the hill?

• Friction

• Inertia

• Gravity

• Momentum

Tags

NGSS.MS-PS2-4

Students use a fan to move paper boats of different masses across a table. The experimental set-up is shown in the diagram below.

Which question is the students most likely trying to answer with this experimental investigation?

• How far does Boat 1 move when the fan is turned on?

• How does the size of a paper boat affect the distance it travels when a constant force is applied?

• Can a fan blow a paper boat across the table?

• How does the mass of a paper boat affect the distance it travels when a constant force is applied?

Tags

NGSS.MS-PS2-2

What other scientific tool do the students need in order to complete this experimental investigation?

• Timing device

• Meter stick

• Spring scale

• Calculator

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What is the unit of measure of force?

• Newton

• Gram

• Meter

• Kilogram

Rubbing your hands together creates which type of force

• Gravity

• Pushing

• Friction

• Pulling