Frictional Forces

Friction is a force that acts in an ___________ direction of movement.

• similar

• opposite

• parallel

• west

Movers slide a box down the ramp of a truck.
What helps slow the box as it slides to the bottom of the ramp?

• friction

• gravity

• inertia

• magnetism

What are 2 factors that determine the amount of friction between 2 objects?

• Force and roughness between surfaces

• hills and valleys and how smooth or rough the surface is

• Amount of force and amount of surface the comes in contact

• The force and the weight exerted on the surfaces

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

• Brakes used on a bike

• Tires from a car on the road

• Tread on the bottom of your shoes

• All are examples that are helpful

What type of force opposes the motion of an object moving across a surface?

• Gravitational force

• Frictional force

• Magnetic force

• Tension force

Which surface would have the least amount of friction?

• A road

• A carpet

• An ice skating ring

• Astro turff

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.

Tags

NGSS.MS-PS2-2

You push on a box and are unable to move it. What force opposes your push?

• static friction

• rolling friction

• sliding friction

• air resistance

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

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

• Wood

• Cardboard

• Glass

• Paper