Friction and Forces

Friction is a force that acts in a(n) ___________ direction relative to a moving object.

• similar

• opposite

• parallel

• perpendicular

How would the absence of friction affect a marble traveling on a long, straight path?

• The marble’s speed would decrease.

• The marble’s speed would increase.

• The marble would stop immediately. 

• The marble would remain at a constant speed.

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What is friction?

• It is a resistance force

• Friction  does not exist

• It is an imaginary force

• It is red

By looking at the picture, what is the best conclusion?

• Friction is in the same direction as Motion

• The Friction force  is  opposite to the direction of  the motion force

• Friction does not count

• I forgot my I-pad

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TRUE or FALSE: Force of friction is always along the path of motion!

• True

• False

• Maybe

• I don't know!

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Which forces does this train have to overcome to reach its maximum speed?

• electricity, friction, and air resistance

• gravitational, magnetic, normal force

• tension, spring, friction

• friction, air resistance, gravitational

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What is the unit that measures force?

• Weight

• Net force

• Newton

• Kilogram

Which would NOT be a way of reducing friction?

• making the surfaces smoother

• using lubricants such as waxes, oils, or grease

• changing from sliding friction to rolling friction using ball bearings

• Using kitty litter on snow and ice to help your car gain traction

What does friction produce?

• light

• sound

• heat

• gravity

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What is force?

•  force is a push or a pull upon an object resulting from the object's interaction with another object.

• something used in Star Wars 

• It is the amount of space between two points.

• It is Superman's power

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