Physics Quizzes

A ball is thrown vertically upward from the surface of the earth. Consider the following quantities (1) the speed of the ball (2) the velocity of the ball (3) the acceleration of the ball A. 1 and 3 B. 1 and 3 C. 1 only D. 2 only E. 1, 2, and 3

A

If a net force of zero is acting on an object, the object is A. moving at a constant velocity B. Accelerating C. Deceleration D. Moving in a circle

A

In a coordinate system, the x-component of a given vector is equal to that vector's magnitude multiplied by which trigonometric function, with respect to the angle between the vector and the x-axis? A. cosine B. sine C. tangent D. Cotangent E. arc cosine

A

Which of the following is responsible for holding a car in a frictionless banked curve? A. the horizontal component of the normal force B. the reaction force to the car's weight C. the vertical component of the car's weight D. the vertical component of the normal force E. the horizontal component of the car's weight

A

Which of the following statements must be true if x=vox+1/2at^2 is to be used A. a is constant B. x is constant C. v is constant D. t is constant E. Both V0 and t are constant

A

When the velocity is positive and acceleration is negative, what happens to the object's motion A. The object slows down B. The object slows down C. Nothing happens to the object D. The object remains at rest

A/B

A baseball is hit upward and travels along a parabolic arc before it strikes the ground. Which one of the following statements is necessarily true? A. the acceleration of the ball decreases as the ball moves upwards B. the x-component of the velocity of the ball is the same throughout the ball's flight C. the velocity of the ball is zero m/s when the ball is at the highest point in the arc D. the acceleration of the ball is zero m/s2 when the ball is at the highest point in the arc E. the velocity of the ball is a maximum when the ball is at the highest point in the arc

B

A rock is thrown vertically upward from the surface of the earth. Te rock rises to some maximum height and falls back toward the surface of the earth. which one of the following statements concerning this situation is true if air resistance is neglected? A. As the ball rises, its acceleration vector points upward B. The ball is a freely falling body for the duration of its flight C. The acceleration of the ball is zero when the ball is at its highest point D. The velocity and acceleration of the ball always points in the same direction

B

A spring-loaded gun is aimed horizontally and is used to launch identical balls with different horizontal velocities. The gun is at a fixed position above the floor. The balls are fired one at a time. If the velocity of the second ball fired is twice the velocity of the first ball, how is the horizontal range affected? A. The range for both balls will be the same B. The range of the second ball will be twice as large as that of the first ball C. The range of the second ball will be half as much as that of the first ball D. The range of the second ball is about 4 times larger than that of the first ball E. The range of the second ball will be smaller than that of the first ball by a factor of 1/4

B

For which one of the following situations will the path length equal the magnitude of the displacement A. a jogger is running around a circular path B. a ball is rolling down an inclined plane C. a train travels 5 miles east; then it stops and travels 2 miles west D. A ball rises and falls after being thrown straight up from the earth's surface E. A ball on the end of a string is moving in a vertical circle

B

In which one of the following situations does the car have a westward acceleration A. The car travels westward at a constant speed B. The car travels eastward and slows down C. The car starts from west and moves toward the east D. The car travels eastward and speeds up E. The car travels westward and slows down

B

Two point masses m and M are separated by a distance of d. If the distance between the masses is increased to 3d, how does the gravitational force between them change? A. force will be 1/3 as great B. force will be 1/9 as great C. force will be 3x as great D. force will be 9x as great E. It is impossible to determine without knowing the numerical values of m, M, and D

B

Which force is responsible for holding a car in an unbanked curve? A. the car's weight B. the force of friction C. the reaction force to the car's weight D. the vertical component of the normal force E. the horizontal component of the normal force

B

Which statement best explains why the weight of an object of mass m is different on Mars than it is on earth? A. mass of mars is different from that of earth B. the masses and radii of mars and earth are not the same C. the mass m is further from the earth's center when it is on mars D. the constant G is different on mars E. the mass m will be different on Mars

B

A racecar is traveling at constant speed around a circular track. what happens to the centripetal acceleration of the car if the speed is doubled? A. it remains the same B. it increases by a factor of 2 C. it increases by a factor of 4 D. it is decreased by a factor of one half E. It is increased by a factor of one-fourth

C

Two balls are thrown from the top of a building. Ball 1 is thrown straight down and ball 2 is thrown with the same velocity, at an upward angle of theta with respect to the horizontal. After the balls are released, what can you say about their accelerations A. the acceleration of ball 1 becomes larger and larger as it falls because the ball is going faster and faster B. The acceleration of ball 2 decreases as it rises, becomes zero at the top of the trajectory, and then increases as the ball begins to fall to the ground C. Both balls have the same acceleration at all times D. Ball 2 has an acceleration in both the horizontal and vertical direction, but ball 1 has an acceleration only in the vertical direction

C

Which of the following is not an example of projectile motion? A. A volleyball served over a net B. A baseball hit by a bat C. A hot-air balloon drifting toward Earth D. A long jumper in action

C

Which one of the following situations is not possible A. A body has zero velocity and non-zero acceleration B. A body travels with a northward velocity and a northward acceleration C. A body travels with a constant velocity and a time-varying acceleration D. A body travels with a northward velocity and a southward deceleration E. A body travels with a constant acceleration and time-varying velocity

C

Which one of the following statements concerning the 2 "gravitational constants" G, the universal gravitational constant, and g the magnitude of acceleration due to gravity, is true? A. Values of g and G depend on location B. Values of g and G do not depend on location C. The value of G is the same everywhere in the universe, but the value of g is not D. The value of g is the same everywhere in the universe, but the value of G is not E. The values of g and G are equal on the surface of any planet, but in general, vary with the location in the universe

C

A measure of the quantity of matter is A. Density B. Weight C. Force D. Mass

D

The earth exerts the necessary centripetal force on an orbiting satellite to keep it moving in a circle at a constant speed. Which statement best explains why the speed of the satellite does not change although there is a net force exerted on it? A. The satellite is in equilibrium B. The acceleration of the satellite is zero m/s^2 C. The centripetal force is canceled by the reaction force D. The centripetal force is always perpendicular to the velocity

D

The maximum speed at which a car can safely negotiate an unbanked curve depends on all of the following factors except A. Diameter of the curve B. Acceleration due to gravity C. Coefficient of static friction between the road and the tires D. Coefficient of kinetic friction between the road and the tires E. the ratio of the static frictional force between the road and the tired and the normal force exerted on the car

D

Which of the following is the tendency of an object to maintain its state of motion? A. Acceleration B. Force C. Velocity D. Inertia E. Displacement

D

A ball is whirled on the end of a string in a horizontal circle of radius R at a constant speed v. The centripetal acceleration of the ball can be increased by a factor of 4 by A. Keeping the speed fixed and increasing the radius by a factor of 4 B. Keeping the radius fixed and increasing the speed by a factor of 4 C. Keeping the radius and increasing the period by a factor of 4 D. Keeping the radius fixed and decreasing the period by a factor of 4 E. Keeping the speed fixed and decreasing the radius by a factor of 4

E