Unit 6: Forces, Motion, and Laws Review 2

Which of these is a good example of Newton's First Law of inertia

• a ball sits motionless on the ground

• a ball gathers speed as it rolls downhill

• a ball accelerates as it falls out of the classroom window

• a ball slows down after it is kicked through the grass

Sam is pushing a cart. How can he make the cart move faster?

• He can add weight to the cart.

• He can push the cart up a ramp.

• He can take the wheels off the cart.

• He can increase the force of his push.

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The acceleration of an object depends on its ____ as well as the force exerted on it.

• mass

• weight

• distance

• speed

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The amount of gravitational force between objects depends on their

• masses and the distances between them.

• inertia.

• speed and direction.

• frictional forces.

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If a car has traveled 15 km in 3 hours, what is the average speed?

• 5 km/h

• 45 km/h

• 0.2 km/h

• 12 km/h

A student walks from home to school, on to a soccer field, then to an ice cream shop, and finally home. What is the student's displacement?

A push or pull is called a(n)

• friction.

• gravity.

• air resistance.

• force.

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If an object moves in the same direction and at a constant speed for 4 hours, which of the following is true?

• The object's speed changed during the 4 hours.

• The object's velocity did not change during the 4 hours.

• The object accelerated during the 4 hours.

• The object decelerated during the 4 hours.

A squirrel scampered across the backyard which was 20 meters long. It took the squirrel 40 seconds to get from one side to the other. What was the squirrel's speed?

• 0.5 m/s

• 87 km/hr

• 50 mph

• 3.4 miles per minute

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Which are examples of distance?

• 3 km NW

• 15 km/hour SW

• 100 feet

• 15 m/s