What is the force that two surfaces exert on each other when they rub against each other?

• Friction

• Magnetism

• Gravity

• Tension

Which type of friction occurs when two solid surfaces slide over each other?

• Fluid friction

• Sliding friction

• Static friction

• Rolling friction

What is the force that pulls objects toward each other?

• Friction

• Gravity

• Magnetism

• Tension

According to the law of universal gravitation, the force of gravity acts between all objects in the universe that have:

• Density

• Volume

• Mass

• Weight

What is a measure of the amount of matter in an object?

• Density

• Mass

• Volume

• Weight

Which type of friction occurs when an object rolls across the surface?

• Sliding friction

• Static friction

• Fluid friction

• Rolling friction

What affects the force of friction between two surfaces?

• Types of surfaces and pressure

• Temperature and color

• Pressure and temperature

• Types of surfaces and distance

What keeps the moon orbiting the Earth?

• Gravity

• Friction

• Tension

• Magnetism

What is a measure of the force of gravity on an object?

• Density

• Mass

• Weight

• Volume

Which factor affects the gravitational attraction between objects?

• Temperature

• Color

• Pressure

• Mass