Newton's laws physics

A person is lifting a box in the garage. Which of these would be shown in a free-body diagram of the person?

• the force of gravity acting on the box

• the force that the person is applying to the box

• the normal force of the garage floor acting on the person

• the force of the person’s weight acting on the garage floor

Tags

NGSS.HS-PS2-1

Which of these statements is true when the same force is applied to two objects of different masses?

• Both objects will accelerate at the same rate and in the same direction.

• Both objects will accelerate at the same rate but in different directions.

• The object with greater mass will experience a greater acceleration than the object with less mass.

• The object with greater mass will experience a smaller acceleration than the object with less mass.

Tags

NGSS.MS-PS2-2

Which of these statements best describes the kinetic friction acting on an object that is touching a surface?

• Kinetic friction is independent of the normal force.

• Kinetic friction is usually more than static friction.

• Kinetic friction acts perpendicularly to the surface.

• Kinetic friction depends on the qualities of the surfaces in contact.

Which of these is always true about the normal force?

• It is a scalar quantity.

• It equals the force of gravity in magnitude.

• It points vertically upward.

• It acts perpendicularly to a surface.

A hammer drives a nail into a piece of wood. Which of these statements describes an action-reaction pair in this situation?

• The hammer exerts a force on the nail; the wood exerts a force on the nail.

• The nail exerts a force on the hammer; the hammer exerts a force on the wood.

• The hammer exerts a force on the nail; the hammer exerts a force on the wood.

• The hammer exerts a force on the nail; the nail exerts a force on the hammer.

Tags

NGSS.MS-PS2-1

Which of these is the correct unit for a newton?

• kg

• kg•m/s

• kg•m/s²

• kg•(m/s)²

Tags

NGSS.HS-PS2-1

Which statement describes a free-body diagram?

• It shows the total sum of all the forces.

• It shows all the forces acting on an object.

• It shows all the forces exerted by an object.

• It shows all the forces acting in one dimension.

Which of these describes a free-body diagram of a ball falling through Earth’s atmosphere?

• only a downward arrow to represent the force of air resistance

• only a downward arrow to represent the force due to gravity

• a downward arrow to represent the force due to gravity and an upward arrow to represent the force of air resistance

• an upward arrow to represent the force due to gravity and a downward arrow to represent the force of air resistance

Two objects of different masses are dropped from the same height at the same time in a vacuum chamber. Which statement describes the movement of the two objects?

• They fall with equal accelerations and with equal displacements.

• They fall with different accelerations and with equal displacements.

• They fall with equal accelerations and with different displacements.

• They fall with different accelerations and with different displacements.

Tags

NGSS.MS-PS2-4

Describe the natural tendency of an object that is in motion.

• To come to a stop

• To change direction

• To continue moving at a constant velocity

• To accelerate