Friction

Which of the following is an example of a contact force?

• Magnetic Force

• Gravitational Force

• Friction

• Electrostatic Force

Answer explanation

Friction is a contact force because it arises from the interaction between surfaces in contact. In contrast, magnetic, gravitational, and electrostatic forces can act at a distance without direct contact.

What is the definition of friction?

• A contact force that resists the sliding motion of two surfaces that are touching.

• The rate of change of position in which the same distance is traveled each second.

• A measure of the change in velocity during a period of time.

• The speed and the direction of a moving object.

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NGSS.MS-PS2-2

How does friction affect the motion of a rolling ball?

• It causes the ball to accelerate

• It does not affect the ball

• It causes the ball to slow down

• It makes the ball change direction

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DOK Level 2: Skill/Concept

What is friction primarily caused by?

• Magnetic fields

• The smoothness of surfaces

• The interaction between surface irregularities

• Air resistance

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DOK Level 1: Recall

Design an experiment to test how different materials affect the friction between two surfaces.

• Measure how long it takes for a block to slide down different fabric-covered inclines.

• Drop various objects from the same height and measure their speed.

• Compare temperatures of different materials after rubbing them together.

• Listen to the sound different materials make when they are scratched.

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DOK Level 4: Extended Thinking

force that opposes the sliding motion between two touching surfaces

example: the force that causes your book to stop moving after being pushed on your desk.

• momentum

• Gravity

• Inertia

• friction

What is the effect of friction on motion?

• It speeds up motion

• It slows down motion

• It has no effect

• It changes the direction of motion

Answer explanation

Friction opposes the relative motion between surfaces in contact. It acts to slow down moving objects, making 'It slows down motion' the correct choice.

Tags

NGSS.MS-PS2-2

Which of the following materials is likely to have the least friction?

• Wood

• Cardboard

• Glass

• Paper

Which of the following is an example of a contact force?

• Magnetic Force

• Gravitational Force

• Friction

• Electrostatic Force

What is the definition of friction?

• A contact force that resists the sliding motion of two surfaces that are touching.

• The rate of change of position in which the same distance is traveled each second.

• A measure of the change in velocity during a period of time.

• The speed and the direction of a moving object.