Gravity and Friction

To push a heavy crate across a floor, you must first overcome _____ friction, before it will start moving.

• static
• sliding
• kinetic
• fluid

Once you get a desk to start moving across the room, you must then push or pull against _____ to keep it moving.

• sliding friction

• velocity

• speed

• static friction

Tags

NGSS.MS-PS2-2

Friction between a surface and air or liquid is called _____ friction.

• fluid
• static
• sliding
• kinetic

Air friction on a car or airplane is also called air _____.

• resistance
• mass
• direction
• volume

Friction between solid surfaces is caused mostly by roughness on a _____ scale.

• microscopic

• telescopic

• kaleidoscopic

• stethoscopic

Friction can also be caused by electrical attraction between particles that have _____ charges.

• opposite

• the same

• neutral

• no

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

Friction between solid surfaces can be reduced with _____.

• lubricants
• more mass
• greater velocity
• greater acceleration

Which of the following is a contact force?

• Gravity

• Magnetic Force

• Electric Force

• Friction

Which of the following is the measure of gravitational force on an object?

• Weight

• Mass

• Acceleration

• Velocity

Tags

NGSS.MS-PS2-4

A force can be represented by an arrow. The arrow's length shows the _____ of the force, and which way the arrow points gives the ____ of the force.

• strength/direction

• strength/speed

• speed/direction

• direction/strength