Physics

An action exerted on an object which may change the object’s state of rest or motion defines

• acceleration.

• force.

• mass.

• velocity.

Tags

NGSS.MS-PS2-2

Which of the following statements describe free-body diagrams?

I. Force diagrams show force vectors as arrows.

II. Forces exerted on the object are represented.

III. Forces exerted by the object are represented.

• I and II

• I and III

• II and III

• I, II, and III

Which of the following situations describes inertia?

• A stationary object tends to resist being moved.

• A moving object tends to resist a change in speed.

• A moving object tends to resist a change in direction.

• all of the above

A force of 5 N and a force of 15 N acting on an object can produce the following net forces except

• 20 N.

• 15 N.

• 10 N.

• 5 N.

Tags

NGSS.MS-PS2-2

Which of the following statements describe an object in equilibrium?

I. The object is at rest.

II. The object is moving at constant velocity.

III. The net external force on the object is zero.

• I and II

• I and III

• II and III

• I, II, and III

In which situation is the net force acting on a car zero?

• The car increases speed and changes direction.

• The car increases speed but does not change direction.

• The car maintains its speed but changes direction.

• The car maintains both its speed and direction.

A batter strikes a baseball with a bat. Identify an action-reaction pair and describe the forces exerted by each.

• The batter exerts a force on the bat; the ball exerts a force on the bat.

• The batter exerts a force on the bat; the bat exerts a force on the batter.

• The bat exerts a force on the batter; the bat exerts a force on the ball.

• The ball exerts a force on the bat; the bat exerts a force on the batter.

Tags

NGSS.MS-PS2-1

The acceleration due to gravity

• is caused by a field force.

• has a magnitude of 9.81 m/s² at Earth’s surface.

• is represented by the symbol, a_g.

• all of the above

Tags

NGSS.MS-PS2-5

The normal force

• equals F_g in magnitude.

• points vertically upward.

• is a scalar quantity.

• acts perpendicular to a surface.

The coefficient of kinetic friction

• is a type contact force.

• is measured in newtons.

• depends on the normal force.

• depends on the composition and qualities of the surfaces in contact.