Linear Physics Unit 2.1 Review

What is a force?

• A push or a pull on an object

• A form of energy stored in an object

• The ability to do work

• The rate of change of an object's displacement.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

In order to change an object's state of motion, you must

• apply a force.

• make it accelerate.

• change its displacement.

• move the object.

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NGSS.MS-PS2-2

ΣF means:

• The net force

• The electric force

• The sigma force

• I dont know.

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NGSS.MS-PS2-2

ΣF = 0 means that

• the net force is zero

• the object is in mechanical equilibrium

• there are no forces action on the object

• all of the forces acting on the object are "canceling out"

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NGSS.HS-PS2-1

An example of an object in static equilibrium is

• a pencil at rest on a desktop

• a shopping cart moving at a constant speed in a straight line

• your phone in the cell phone pouch

• A car moving at a constant speed in a perfect circle

An example of an object in dynamic equilibrium is

• a pencil at rest on a desktop

• a shopping cart moving at a constant speed in a straight line

• your phone in the cell phone pouch

• A car moving at a constant speed in a perfect circle

Newton's First Law of Motion states

• an object at rest (or in motion) will remain at rest (or in motion) unless acted upon by an unbalanced force.

• the sum of all forces are equal to zero.

• for every action there is an equal and opposite reaction.

• acceleration of an object is directly proportional to the force applied to it and inversely proportional to the mass of the object.

The standard unit for force is the

• newton (N).

• pound (lb).

• gram (g)

• meter (m)

An easy way to remember the approximate amount of force of 1 newton is the weight of a(n) ____ in your hand.

• apple

• orange

• grapefruit

• avocado

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NGSS.5-PS2-1

During a tug-of-conflict, the blue team exerts a force of 500 N and the red team exerts a force of -400 N. What is the net force?

• ΣF = 100 N

• ΣF = 0

• ΣF = -100 N

• ΣF = 900 N

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NGSS.MS-PS2-2