Download Unit 4 Study Guide - Hastings High School

AP Physics
Unit 4 Study Guide
In the space provided, select each choice that correctly completes the statement.
________1) The acceleration of a body is
A) directly proportional to the force exerted.
C) in the same direction as the applied force.
B) dependent on the initial velocity of the body.
D) is inversely proportional to the body's mass.
________2) The Newton is
A) the unit of force used in the CGS system of measurement.
C) the force required to accelerate 1 kg at a rate of 1 m/s/s.
B) a derived unit of measurement.
D) equal to 1 kg*m/s2.
________3) The relationship between the mass of an object and its weight is described by
A) weight equals mass times acceleration due to gravity.
B) w * m = g
C) mass times 9.80 m/s/s equals weight.
D) mass divided by weight equals "g".
________4) A net force
A) is the force applied to an object.
C) results in accelerated motion.
________5) Friction is beneficial
A) between the steel parts in a cars engine.
C) when shooting a basketball.
B) must be caused by contact.
D) is a vector.
B) when using brakes to stop your bike.
D) between the wheel and axle of rollerblades
________6) When a person in a canoe pulls his paddle through the water to go forward
A) the paddle pushes backward on the water.
B) the paddle pushes forward on the water.
C) the water pushes forward on the paddle.
D) the water pushes backward on the paddle.
________7) The force of friction
A) is proportional to the normal force.
C) is proportional to the applied force.
B) is dependent on the types of surfaces.
D) is dependent on the area of contact.
________8) If the distance between two objects is decreased to one half the original distance,
A) the force of attraction between the two objects will decrease.
B) the force of attraction between the two objects will increase.
C) the force of attraction between the two objects will double.
D) the force of attraction between the two objects will quadruple.
E) the force of attraction between the two objects will be cut in half.
________9) Compared to his weight in a valley, what would be true of Joe’s weight on the top of a mountain?
A) His weight would decrease.
B) His weight would increase.
C) His weight is the same.
________10) An object is travelling at a constant velocity. What happens to its velocity if a force is then
applied in the direction of its velocity?
A) The velocity of the object will remain constant.
B) The velocity of the object will increase as long as the force is applied.
C) The object will accelerate.
D) The velocity of the object will decrease.
________11) Newton's Third Law of Motion deals with
A) one object, two forces.
B) two objects, one force.
C) two objects, two forces.
D) action and reaction.
________12) The normal force
A) is the component of weight perpendicular to the surface. B) does not affect the force of friction.
C) is the force of contact between two surfaces.
D) is equal to the weight on a horizontal surface.
________13) On an inclined plane
A) weight pulls an object downhill.
C) friction can keep an object from sliding.
B) weight pushes the object against the surface.
D) two forces work against pulling uphill.
________14) Newton's First Law of Motion
A) deals with the effects on an object's acceleration.
C) says that friction causes moving objects to slow down.
B) deals with action and reaction.
D) deals with gravitational attraction.
________15) The force on an object that directly determines the object's acceleration is the
A) frictional force.
B) net force.
C) normal force.
D) force applied.
________16) With the same amount of force, adding three people to your car will make the acceleration
A) increase.
B) decrease.
C) stay the same.
________17) Which of Newton's Laws of Motion would be most important in answering #16?
A) First
B) Second
C) Third
________18) Which of the following are examples which reduce friction?
A) oil in a car's engine
B) WD-40 applied to a squeaky hinge
C) increasing the normal force
D) ball bearings in rollerblade wheels
________19) If the coefficient of friction is high between two surfaces,
A) the surfaces are attracted to each other.
B) there is little resistance to sliding.
C) the two surfaces slide easily against each other.
D) the frictional force will be higher.
________20) Why is the gravitational attraction between the Sun and Pluto less than the Sun and Earth?
A) Pluto is farther from the Sun than Earth
B) Pluto has more mass than Earth
C) Pluto is closer to the Sun than Earth
D) Pluto has less mass than Earth
________21) Which of the following is true for an object that moves at a constant velocity?
A) the net force is greater than zero
B) the frictional force is greater than the applied force
C) the normal force is zero
D) the frictional force and applied force are equal
________22) To cause a stationary object to move, the force applied has to overcome
A) fluid friction.
B) kinetic friction.
C) rolling friction.
D) static friction.
________23) The sum of all the forces acting on an object is the
A) force of friction.
B) force applied.
C) normal force.
D) net force.
________24) The acceleration an object experiences is
A) proportional to the amount of force applied
C) caused when there is a net force on an object.
B) proportional to the mass of the object.
D) greater when the force of friction is higher.
________25) When a tablecloth is pulled out from under a set of dishes and the dishes stay put, which of
Newton's Laws is being demonstrated?
A) First Law of Motion – Law of Inertia
B) Second Law of Motion – Law of Acceleration
C) Third Law of Motion – Law of Interaction
D) Universal Law of Gravitation
Answers: 1ACD, 2BCD, 3AC, 4CD, 5BC, 6AC, 7AB, 8BD, 9A, 10BC, 11CD, 12ACD, 13ABCD, 14C, 15B
16B, 17B, 18ABD, 19AD, 20AD, 21D, 22D, 23D, 24AC, 25A