Chapter 1 - Laws of Motion

Which measures the quantity of matter of an object?

• mass

• weight

• net force

• density

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NGSS.MS-PS1-5

A(n) __________ is a push or a pull.

• motion

• acceleration

• force

• velocity

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Which is a force that resists motion between two surfaces that are in contact?

• acceleration

• friction

• inertia

• gravity

The strength of the gravitational force between two objects depends on which of the following?

• the mass of the larger object

• the mass of the objects and the distance between them

• the velocities of the objects

• the orbits of the objects

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NGSS.MS-PS2-2

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Friction always acts __________ the direction of motion of an object.

• opposite to

• perpendicular to

• in the same direction as

• at a 45° angle to

Forces that cancel each other are called __________ forces.

• inactivated

• unbalanced

• balanced

• neutral

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The __________ is the combination of all the forces acting on an object.

• direction of motion

• force pair

• inertia

• net force

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When balanced forces act on an object, the net force is __________.

• positive

• zero

• negative

• increased due to friction

Newton's first law of motion states that __________.

• an object will remain at rest or keep moving with a constant velocity unless a force acts on it

• acceleration is calculated by dividing the force exerted on an object by the mass of the object

• when a force acts on an object, its acceleration is in the same direction as the force

• when a force is applied to an object, there is an equal force applied by the object in the opposite direction

A ball is thrown straight up in the air. According to Newton's first law of motion, what is the reason for the ball falling back to Earth?

• A force has acted on it.

• The change in the ball's acceleration is proportional to the force acting on it.

• The ball exerts a force on the air surrounding it.

• It is accelerating in the same direction as Earth's gravitational force on it.

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