Review for Chapter 11 - PC\|MAC



1.?Which of the following is an example of an unbalanced force??a.?book sitting on a table?b.?car sitting in the garage?c.?person on an elevator going down?d.?person leaning on a wall2.?A car goes around a curve at a constant speed. There is not a net force acting on it. _______________3.?A skater slowing as she slides across the ice is an example of _____.?a.?inertiab.?momentum?c.?frictiond.?mass4.?Forces that are equal in size but opposite in direction are ____.?a.?balanced forcesb.?frictional forces?c.?inertial forcesd.?net forces5.?When two birds are pulling on a worm and the worm moves toward the first bird, you know that the forces are ____.?a.?long-rangeb.?action-reaction?c.?unbalancedd.?balanced6.?An unbalanced force acting on an object causes it to ____.?a.?move at constant speedb.?continue in a straight line?c.?not change its velocityd.?accelerate7.?Mike has a mass of 60 kg. He pulls on a wagon of mass 30 kg with a force of 20 N. The wagon remains motionless. The wagon exerts a force of ____________________ on Mike.8.?To keep a sled accelerating downhill, the force of gravity must be greater than the ____________________ force.9.?Speeding up, slowing down, and going around curves are examples of ____________________.10.?If you are riding on a skateboard and it stops suddenly, your body keeps moving forward. This is because of ____________________.11.?A spacecraft orbits the Earth at a constant speed. The forces acting on it must be ____________________.12.?You push on a crate with a force of 10 N to the right, and your friend pushes on the crate with a force of 25 N to the left. Describe and explain the motion of the crate.13.?Is it necessary for an object to be in motion if it has forces acting on it? Why or why not?14.?Which of the following is an example of a noncontact force??a.?musician playing piano?b.?athlete hitting a ball with a bat?c.?a ball falling after you toss it in the air?d.?karate expert breaking a stack of wood15.?An arrow can be used to represent a force. The length of the arrow represents _____.?a.?direction of the forceb.?strength of the force?c.?mass of the forced.?acceleration of the force16.?An object’s weight is _____ its mass.?a.?equal tob.?less than?c.?proportional tod.?greater than17.?The force you have to overcome to start an object moving is ____.?a.?rolling frictionb.?static friction?c.?sliding frictiond.?air resistance18.?The upward force on an object falling through the air is ____.?a.?air resistanceb.?inertia?c.?gravityd.?terminal velocity19.?The unit of force is ____.?a.?m/sb.?the hertz?c.?the jouled.?the newton20.?The force that opposes motion is ____.?a.?a balanced forceb.?an unbalanced force?c.?an accelerating forced.?friction21.?Newton's first law of motion states that an object stays in constant motion unless a(n) ____________________ force acts on it.22.?A(n) ____________________ is a push or pull that one object exerts on another.23.?Friction always acts in a direction ____________________ to the direction of motion.24.?Forces that change an object's motion by touching the object are ____________________ forces.25.?A book and a piece of paper the same size fall at different rates. How can you change the shape of the paper so that it will fall nearly as fast as the book?26.?Which of the following is NOT an example of circular motion??a.?car turning a corner?b.?yo-yo on a string going in a circle?c.?car accelerating onto highway?d.?the Moon’s path around Earth27.?The relationship among force, mass, and acceleration is stated in ____.?a.?the law of conservation of momentumb.?Newton's first law of motion?c.?Newton's second law of motiond.?Newton's third law of motion28.?According to Newton's second law of motion, ____.?a.?F = mvb.?F = m/a?c.?a = Fnet /md.?F = ma29.?A 3,000-N force gives an object an acceleration of 15 m/s2. The mass of the object is ____.?a.?45,000 kgb.?1,500 kg?c.?200 kgd.?15 kg30.?Two crates, one heavy and one light, are at rest on a waxed floor. Which crate will need the greater force to give the same change in speed? Explain.31.?Acceleration depends on which two factors?32.?Calculate the force on an object that has a mass of 12 kg and an acceleration of 4 m/s2.33.?Which of the following best completes the phrase?For every action there is _____.?a.?a reactionb.?an equal reaction?c.?an opposite reactiond.?an equal and opposite reaction34.?Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the _____ direction to that of the first object.?a.?oppositeb.?same?c.?right angled.?vertical35.?A student hits a nail with a hammer. During the collision, there is _____.?a.?a force on the hammer but not on the nail?b.?a force on the nail but not on the hammer?c.?a force on the nail and also on the hammer?d.?no force on either object in the collision36.?Which of the following is the equation for momentum??a.?b.??c.?d.?37.?Two toy cars that have the same mass and same speed move toward each other, collide, and stick together. After the collision, the momentum of the cars is _____.?a.?twice the original momentum?b.?half the original momentum?c.?the same as the original momentum?d.?ten times the original momentum38.?A collision is considered elastic if _____.?a.?the objects do not stick together?b.?the objects that collide don’t get warmer?c.?after the collision, the objects have the same shape as before the collision?d.?All of the above.39.?The statement "for every action, there is an equal but opposite reaction" is a statement of ____.?a.?the law of conservation of momentumb.?Newton's first law?c.?Newton's second lawd.?Newton's third law40.?A rocket launching is an example of Newton's ____________________ law.41.?Kelly sits on a rock. Her weight is an action force. Describe the reaction force.42.?Identify two pairs of action-reaction forces involving the rope. ................
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