Forces and Motion PreAssessment

What is Newton's first law of motion?

• An object in motion will eventually come to a stop

• An object at rest will start moving on its own

• An object in motion will change direction without any force

• An object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Explain the difference between static and kinetic friction.

• Static friction only occurs in liquids, while kinetic friction only occurs in solids.

• Static friction and kinetic friction are the same thing.

• Static friction occurs when two objects are moving relative to each other, while kinetic friction occurs when two objects are not moving relative to each other.

• Static friction occurs when two objects are not moving relative to each other, while kinetic friction occurs when two objects are moving relative to each other.

Name three types of forces and provide an example of each.

• Thermal force, pressure force, and chemical force

• Gravitational force, electromagnetic force, and nuclear force

• Magnetic force, centripetal force, and contact force

• Frictional force, tension force, and elastic force

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Define inertia and give an example of it in everyday life.

• Inertia is the tendency of a moving object to slow down and stop

• Inertia is the tendency of a moving object to continue moving or a stationary object to remain at rest.

• Inertia is the tendency of a stationary object to move on its own

• Inertia is the tendency of an object to change its shape when in motion

According to Newton's second law of motion, what is the relationship between force, mass, and acceleration?

• Force is directly proportional to mass and acceleration

• Force is inversely proportional to mass and acceleration

• Force is directly proportional to mass but not to acceleration

• Force has no relationship with mass and acceleration

Tags

NGSS.MS-PS2-2

How does friction affect the motion of an object?

• Friction increases the speed of an object

• Friction opposes the motion of an object

• Friction causes the object to move in a straight line

• Friction has no effect on the motion of an object

Explain the difference between balanced and unbalanced forces.

• Balanced forces have unequal magnitude and/or direction, resulting in a change in motion. Unbalanced forces have equal magnitude and opposite direction, resulting in no change in motion.

• Balanced forces have equal magnitude and opposite direction, resulting in a change in motion. Unbalanced forces have equal magnitude and same direction, resulting in no change in motion.

• Balanced forces have equal magnitude and same direction, resulting in a change in motion. Unbalanced forces have equal magnitude and opposite direction, resulting in no change in motion.

• Balanced forces have equal magnitude and opposite direction, resulting in no change in motion. Unbalanced forces have unequal magnitude and/or direction, resulting in a change in motion.

Tags

NGSS.MS-PS2-2

How does mass affect an object's inertia?

• Mass affects an object's inertia by decreasing it.

• Mass affects an object's inertia by changing its direction.

• Mass affects an object's inertia by increasing it.

• Mass has no effect on an object's inertia.

According to Newton's first law of motion, an object at rest will remain at rest unless acted upon by what?

• internal force

• external force

• Friction

• Gravity

What is the force that opposes the motion of objects sliding past each other?

• Friction

• Inertia

• Velocity

• Gravity