Forces Unit Review

Which statement about the acceleration of an object is correct?

• The acceleration of an object is directly proportional to the net external force acting on the object and

  inversely proportional to the mass of the object

• The acceleration of an object is inversely proportional to the net external force acting on the object and

  directly proportional to the mass of the object.

Tags

NGSS.MS-PS2-2

A leaf falls from a tree and lands on the sidewalk. Identify an action-reaction pair in this situation.

• The tree exerts a force on the leaf; the sidewalk exerts a force on the leaf.

• The leaf exerts a force on the sidewalk; the tree exerts a force on the leaf.

• The leaf exerts a force on the sidewalk; the sidewalk exerts a force on the leaf.

Which type of friction takes more force to overcome?

• kinetic

• static

• sliding

• all

The magnitude (size/amount) of gravitational force acting on an object is

• inertia

• mass

• friction

• weight

Tags

NGSS.MS-PS2-4

What causes a moving object to change direction?

• acceleration

• velocity

• an unbalanced force

• inertia

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-5

Which are simultaneous equal but opposite forces resulting from the interaction of two objects?

• action-reaction pairs

• field forces

• gravitational forces

• net external forces

Tags

NGSS.MS-PS2-1

According to Newton’s second law, when the same force is applied to two objects of different masses,

• the object with greater mass will experience a great acceleration, and the object with less

  mass will experience an even greater acceleration.

• the object with greater mass will experience a smaller acceleration, and the object with less mass will

  experience a greater acceleration.

• the object with greater mass will experience a small acceleration, and the object with less mass will experience even smaller acceleration

Tags

NGSS.MS-PS2-2

A ball is dropped from a person’s hand and falls to Earth. Identify an action-reaction pair in this situation.

• Earth exerts a force on the hand; the hand exerts a force on the ball.

• .

  Earth exerts a force on the ball; the ball exerts a force on Earth.

• Earth exerts a force on the ball; the hand exerts a force on Earth.

Tags

NGSS.MS-PS2-4

Which of the following statements does not describe force?

• Force causes objects to start moving.

• Force causes objects to change direction.

• Force causes objects to stop moving.

• Force causes objects at rest to remain stationary.

Tags

NGSS.MS-PS2-2

The statement by Newton that for every action there is an equal but opposite reaction is which of his laws of

motion?

• second

• first

• fourth

• third

Tags

NGSS.MS-PS2-1