Force and Friction

What type of force helps slow down a moving car?

• normal force

• gravitational force

• electrical force

• frictional force

Tags

NGSS.MS-PS3-1

The force that acts in the opposite direction of motion when two surfaces come in contact. 

• Force

• Friction

• Static

• Kinetic 

How can friction be reduced?

• reduce the force acting between the 2 surfaces

• reduce the roughness of the 2 surfaces coming in contact

• use wax, grease or oil

• all of the above are ways of reducing friction

Tags

NGSS.MS-ETS1-2

Which of the following is an example of friction that is helpful?

• Brakes used on a bike

• Tyres from a car on the road

• Tread on the bottom of your shoes

• All are examples that are helpful

What is the unit that measures force?

• Weight

• Gram

• Newton

• Kilogram

How would the absence of friction affect a marble travelling 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.

Tags

NGSS.MS-PS2-2

If heavy objects are made to roll, _______friction comes into play.

• sliding friction

• rolling

• static friction

• kinetic friction

Which is not the advantage of friction?

• Friction helps in walking.

• Friction allows us to write on paper.

• Cars and buses move safely on roads due to friction.

• Friction causes wear and tear.

Tyres of vehicles have grooved designs to

• reduce friction

• increase friction

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

Friction can be increased by increasing the ________of the surfaces in contact.

• Smoothness

• Area

• Roughness

• None of the above