Forces and Newton's Laws

1 The SI unit of force is the

• kg, kilogram

• N, Newton

• m, meter

• J, Joule

Which of the following relationships is correct?

• 1N = 1kg

• 1N = 1kg-m

• 1N = 1kg-m/s

• 1N = 1kg-m/s/s

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NGSS.HS-PS2-1

When an unbalanced force acts on an object,

• the object's motion does not change.

• the object accelerates.

• the weight of the object decreases.

• the inertia of the object increases.

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NGSS.MS-PS2-2

What kind of friction occurs as a fish swims through water?

• fluid

• rolling

• sliding

• static

As you push a cereal box across a tabletop, the sliding friction acting on the cereal box

• acts in the direction of motion.

• equals the weight of the box.

• is usually greater than static friction.

• acts in the direction opposite of motion.

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NGSS.MS-PS2-2

The forces acting on a falling leaf are

• air resistance and fluid friction

• gravity and air resistance

• gravity and static friction

• weight and rolling friction

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NGSS.MS-PS2-2

An open parachute increases air resistance of a falling sky diver by

• decreasing the weight of the diver.

• increasing surface area.

• increasing the terminal velocity.

• reducing fluid friction.

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NGSS.MS-PS2-2

The property of matter that resists changes in motion is called

• friction

• gravity

• inertia

• weight

An orange might roll off your cafeteria tray when you stop suddenly because of

• the balanced forces acting on the orange.

• the centripetal force acting on the orange.

• the friction forces acting on the orange.

• the orange's inertia.

According to Newton’s second law of motion, the acceleration of an object equals the net force acting on the object divided by the object’s

• mass

• momentum

• velocity

• weight

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NGSS.MS-PS2-2