PS.5.2.1 — Force and Motion

How does friction affect motion?

• Friction has no effect on motion.

• Friction speeds up motion when two surfaces rub against each other.

• Friction slows down or stops motion when two surfaces rub against each other.

• Friction only affects motion in liquids.

What can a force do to an object?

• A force can cause an object to start moving, stop, change speed, or change direction.

• A force can only stop an object.

• A force can only change the color of an object.

• A force can only make an object heavier.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

How does gravity affect motion?

• Gravity pulls objects toward Earth and can change their speed and direction.

• Gravity has no effect on the motion of objects.

• Gravity only affects objects that are in free fall.

• Gravity pushes objects away from the Earth.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Give an example of friction in the real world.

• A soccer ball slowing down on grass because of the surface resistance.

• A car accelerating on a smooth road without any resistance.

• A person sliding down a slide without any friction.

• A boat gliding smoothly on water without any drag.

Tags

NGSS.MS-PS2-2

What happens when mass increases but the force stays the same?

• The object moves faster—the same force has more effect on a heavier object.

• The object moves slower—the same force has less effect on a heavier object.

• The object remains at rest regardless of the mass increase.

• The object accelerates at the same rate as before.

Tags

NGSS.MS-PS2-2

What is a force?

• A push or a pull on an object.

• A type of energy that can be converted into work.

• A measure of an object's mass.

• The speed at which an object moves.

Tags

NGSS.MS-PS2-1

What happens when you apply a greater force to an object?

• It causes a greater change in the object’s motion (more speed or faster change in direction).

• It causes the object to become heavier.

• It makes the object stop moving altogether.

• It has no effect on the object's motion.

Tags

NGSS.MS-PS2-2