Friction_Gravity_Force

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

• similar
• opposite
• parallel
• west

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-PS2-2

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

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

Tags

NGSS.3-PS2-1

When most objects with smooth surfaces rub, there is less friction.

• True
• False

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

• amount of force pressing the surfaces together and type of surface

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

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

• The force and the weight exerted on the surfaces

Any object with mass has gravity.

• True
• Sometimes
• False
• Never

Tags

NGSS.MS-PS2-4

As distance between two objects increase the pull of gravity 

• Increases
• Decreases
• Stays the same

Tags

NGSS.MS-PS2-4

As mass increases, what happens to gravitational force?

• increases
• decreases
• stays the same
• i don't know

Tags

NGSS.MS-PS2-4

Which model has greater gravitational attraction (if any)

• Model A
• Model B
• Both Model A and Model B (same gravity)

Tags

NGSS.MS-PS2-4

NGSS.MS-ESS1-2