Exploring Forces in Simple Systems

Match the following forces with their descriptions.

• The force that opposes motion between two surfaces in contact.

• Electricity

• The force that pulls objects toward the center of the Earth.

• Magnetism

• The force that attracts certain metals and magnets.

• Friction

• The force associated with electric charges.

• Gravity

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TEKS.SCI.5.7B

(a)   is an example of a simple machine that can be used to apply force.

• Lever
• Battery
• Light bulb
• Wire

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TEKS.SCI.5.7B

If you increase the height of a ramp, what happens to the speed of a car rolling down it?

• The speed decreases

• The speed increases

• The speed remains the same

• The car stops

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TEKS.SCI.5.7B

Which of the following best describes the effect of friction on a moving object?

• It speeds up the object

• It slows down the object

• It changes the color of the object

• It makes the object heavier

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TEKS.SCI.5.7B

A balloon rocket is attached to a string. What will happen if you release the air from the balloon?

• The balloon will move along the string

• The balloon will stay in place

• The balloon will fall to the ground

• The balloon will inflate more

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TEKS.SCI.5.7B

Design an experiment to test how the angle of a ramp affects the speed of a toy car. What is the independent variable in this experiment?

• The speed of the car

• The angle of the ramp

• The type of car

• The length of the ramp

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TEKS.SCI.5.7B

Which of the following is a force that opposes motion between two surfaces that are in contact?

• Gravity

• Friction

• Magnetism

• Buoyancy

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TEKS.SCI.5.7B

What happens to the force needed to push a car up a ramp if the ramp is made steeper?

• The force needed decreases

• The force needed increases

• The force needed stays the same

• The car moves by itself

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TEKS.SCI.5.7B

In an experiment with a balloon rocket, what is the role of the string?

• To provide a path for the balloon to follow

• To inflate the balloon

• To add weight to the balloon

• To change the color of the balloon

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TEKS.SCI.5.7B

The relationship between force and motion is that force can (a)   the speed or direction of motion.

• always stop
• change
• have no effect on
• only affect objects at rest

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TEKS.SCI.5.7B