Forces and Interactions

What is force?

• The cause of acceleration.

• A push or pull acting on an object.

• Both A and B

• Neither A nor B

Tags

NGSS.HS-PS2-1

Define friction.

• A smooth and shiny metal.

• A coating that makes things slippery.

• A force that opposes motion between any surfaces that are touching.

• A danger to friendship.

Why does friction warm your hands when you rub them together?

• Friction has no effect on the molecules of rubbing surfaces.

• Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.

• Friction slows molecules down on the molecules of rubbing surfaces.

• Friction doesn't warm your hands, gloves do.

Tags

NGSS.MS-PS3-5

What is the traditional definition of gravity?

• A force that opposes motion between any surfaces that are touching.

• A force that bonds the protons and neutrons in the nucleus.

• A force of attraction between things that have mass.

• What goes up must come down.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

Identify factors that influence the strength of gravity between two objects.

• The strength of gravity between two objects depends on their mass and their distance apart.

• Rough surfaces and heavier weight.

• Length and distance.

• Height and width.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-2

Explain why an astronaut would weigh less on the moon than on Earth.

• The moon has a higher gravity than Earth.

• The moon has the same gravity as Earth.

• The moon has no gravity at all.

• The moon has a lower gravity than Earth.

Tags

NGSS.MS-PS2-4

What is Newton’s law of universal gravitation?

• The force of gravity has no affect on anything with mass in the universe.

• The force of gravity affects everything with mass in the universe.

• The force of gravity affects only things with very large mass.

• The force of gravity affects some things with mass in the universe.

Tags

NGSS.MS-PS2-4

State Newton’s first law of motion.

• An object in motion will remain at rest and an object at rest will remain in motion unless it gets off balance.

• An object at rest will remain at rest and an object in motion will remain in motion unless it is acted on by an unbalanced force.

• An object will move in the opposite direction due to gravity.

• An object will travel in a straight line.

What is inertia?

• The tendency of an object in motion to remain at rest.

• The tendency of an object at rest to remain in motion.

• The tendency of an object to move in a zig-zag movement.

• The tendency of an object to resist a change in its motion.

How does inertia affect the motion of an object?

• Inertia must be overcome by a change in motion.

• Inertia must be overcome by an object at rest.

• Inertia must be overcome by an unbalanced force acting on the object.

• Inertia must be overcome by a balanced force acting on the object.

Tags

NGSS.MS-PS2-2