Review

The SI unit for force is the

• newton.

• meter.

• kilogram.

• pound.

When an object’s distance from another object is changing,

• it is in motion.

• it is speeding.

• it has a high velocity.

• it is accelerating.

Which of these is an example of negative acceleration?

• A bird taking off for flight.

• A roller coaster moving down a steep hill.

• A car approaching a red light.

• An airplane following a straight flight path.

What happens when two forces act in the same direction?

• They cancel each other out.

• The stronger one prevails.

• They add together.

• Their sum divided by two is the total force.

When you know both the speed and direction of an object’s motion, you know the

• average speed of the object.

• acceleration of the object.

• distance the object has traveled.

• velocity of the object.

Which of these BEST illustrates Newton’s first law of motion?

• A ice-skating ring has more friction than a soccer field.

• An asteroid flowing in space will move at a constant velocity until an net force acts on it.

• When a force affects an object the amount of mass in an object does not affect its acceleration.

• When a moving marble strikes another a stationary marble, both move forward at the same velocity.

The greater the mass of an object,

• the easier the object starts moving.

• the greater its inertia.

• the more balanced it is.

• the more space it takes up.

Simon rolled a ball down a hill. The ball stopped before it reached the bottom of the hill. Which of these MOST LIKELY stopped the ball from rolling?

• mass

• gravity

• friction

• inertia

If a bicyclist travels 180 kilometers in three hours, her average speed is

• 60 m/h.

• 60 km/h.

• 540 km/h.

• 540 m/h.

The blocks shown in the pictures below are all made of wood. Which car will move the fastest?

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