Forces and Motion

The factors that affect the gravitational force on an object are

• the mass of each object and the distance between them.

• type of surfaces and how strongly they are pressed together

• weight of each object and the friction between them

• mass and weight of each object

Tags

NGSS.MS-PS2-4

Friction acts in a direction ____________ to the direction of the object's motion.

• opposite to

• the same as

• parallel to

• perpendicular

The two factors that affect friction are

• types of surfaces involved and how hard those surfaces are pressed together

• mass and distance from the center of the object

• force and energy

• weight and mass

When all the forces on a parachutist are ________________, they fall at terminal velocity.

• balanced

• unbalanced

• non-zero

• strong

Tags

NGSS.MS-PS2-2

When an object moves through the air, the fluid friction acting on the object is

• air resistance

• gravity

• inertia

• terminal velocity

If similar materials are used, rolling friction _________________ is much easier to overcome than sliding friction.

• rolling

• static

• fluid

Friction acts in a direction ____________ to the direction of the object's movement.

• opposite to

• the same as

• parallel to

• perpendicular

Friction ______________ as the surfaces are pushed more against each other.

• increases

• decreases

• remains the same

In general, smoother surfaces produce ____________ friction than rougher surfaces.

• less

• more

• the same amount

Newton's third law states that every action will have an equal and opposite reaction.

• equal; opposite

• equal; similar

• greater; opposite

• equal; different

Tags

NGSS.MS-PS2-1