Friction is defined as a. force that opposes motion between two touching surfacesb. the rate at which velocity changesc. resistance of an object to changes in its velocityd. speed of an object in a particular direction

Which of the following units is used to measure acceleration in free falla. m/sb. m*sc. m/s2

d. m2/s2

Which of the following best illustrates balanced forces?a. a rock falling to the groundb. a stretched rubber band being held between two handsc. a person lifting a heavy box off of the groundd. a crash between a large truck and a train

What is the speed of an object at rest?a. 15 km/hb. 0 km/hc. 9.8 m/s2

d. none of the above

The combination of all of the forces acting on an object is calleda. total forceb. union of forcesc. super forced. net force

The difference between speed and velocity is that velocity includesa. directionb. distancec. timed. weight

If you divide momentum by velocity, the result is the object’sa. massb. directionc. energyd. speed

Earth pulls on the moon and holds the moon in its orbit. The moon pulls on Earth with an equal and opposite force. This is an example ofa. Newton’s 1st lawb. Newton’s 2nd lawc. Newton’s 3rd lawd. None of the above

Which object does not have momentuma. a fish swimming in a pondb. a feather falling to the groundc. a rock by the side of the roadd. a boulder rolling down a hill

A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusion can be drawn?a. The mass of object has increasedb. Gravity on object has increasedc. Object is experiencing some kind of frictiond. momentum has reached a maximum

In order to determine speed, you must knowa. timeb. distancec. both a and bd. none of the above

What happens immediately after a skydiver opens her parachute?a. Air resistance greatly increasesb. the skydiver is in free fallc. the skydiver’s speed greatly increasesd. the force of gravity greatly increases

What is the unbalanced force that slows down a ball rolling across the floor?a. frictionb. gravityc. inertiad. momentum

Which straight-line acceleration indicates an increase in speed?a. 0 m/s2

b. –15 m/s2

c. 4 m/s2

d. All of the above

A car is parked on a hill. In order to keep the car from rolling downhill, how great must the static friction on the car be?a. equal to the force pulling the car dowhillb. greater than the force pulling the car downhillc. greater than the force pulling the car uphilld. smaller than the force pulling the car uphill

An object is in motion whena. you observe the object move.b. the object’s speed increasesc. the object’s displacement is greater than the distance traveledd. the object changes position relative to a stationary reference point

Which of the following is true?a. weight and mass are proportional but not equalb. weight is the gravitational force an object experiences due to massc. the weight of an object on Earth is greater than the weight of the same object on the surface of the moon, but the object’s mass stays the samed. All of the above

Which is an example of kinetic friction?a. friction between a car’s windshield and the air as you drive into the windb. friction between your shoes and the ground when you stand stillc. friction between a sticky note and the page of a bookd. friction between your skin and a pencil as it rests in your palm

The law that states that every object maintains constant velocity unless acted on by an unbalanced force is a. Newton’s 1st lawb. Newton’s 2nd lawc. Newton’s 3rd lawd. law of conservation of momentum

What is the reaction force when you place a cup on a table?a. the force of cup on tableb. the force of table on cupc. the force of gravity on tabled. the force of gravity on cup

If the net force acting on a stationary object is zero, then the object willa. accelerate in the direction of strongest forceb. remain at restc. begin moving backwardsd. decelerate at a steady rate

When air resistance balances the weight of an object that is falling, the velocitya. slowly decreasesb. remains constantc. rapidly increasesd. None of the above

Which of the following is not a factor in calculating momentum?a. massb. directionc. accelerationd. speed

On a velocity-time graph, a line with a negative slope indicates that the object is a. speeding upb. slowing downc. not movingd. traveling at constant speed

Which of the following statements is true?a. Frictional forces are greatest when both surfaces are roughb. When a truck is parked on a hill, friction pulls the truck down the hill.c. Air resistance always opposes frictiond. All of the above

Answers

• 1. A• 2. C• 3. B• 4. B• 5. D• 6. A• 7. A• 8. C• 9. C

• 10. C• 11. C• 12. A• 13. A• 14. C• 15. A• 16. D• 17. D• 18. A

• 19. A• 20. B• 21. B• 22. B• 23. C• 24. B• 25. A