Apologia Physical Science

The SI unit of force is the

• joule.

• kilogram.

• meter.

• newton.

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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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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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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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Figure 12-1 shows the motion of three balls. The curved paths followed by balls B and C are examples of

• centripetal motion.

• constant motion.

• linear motion.

• projectile motion.

Projectile motion is caused by

• the downward force of gravity.

• an initial forward velocity.

• a final vertical velocity.

• the downward force of gravity and an initial forward velocity.

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The property of matter that resists changes in motion is called

• friction.

• gravity.

• inertia.

• weight.

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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Newton’s third law of motion describes

• action and reaction forces.

• balanced forces.

• centripetal forces.

• net force.

The product of an object’s mass and velocity is its

• centripetal force.

• momentum.

• net force.

• weight.

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