Velocity Chapter 2 Quiz Questions
- 1.Which of the following quantities is not a vector quantity?
- A.
Velocity
- B.
Acceleration
- C.
Mass
- D.
Force
- 2.Which of the following statements is incorrect?
- A.
All vector quantities have directions
- B.
All vector quantities have magnitudes
- C.
All scalar quantities have directions
- D.
All scalar quantities have magnitudes
- 3.A box suspensed by a rope is pulled to one side by a horizontal force. The tension in the rope
- A.
Is less than before
- B.
Is unchanged
- C.
Is greater than before
- D.
May be any of the above, depending on how strong the force is
- 4.The sum of two vectors is a minimum when the angle between them is
- A.
0
- B.
45
- C.
90
- D.
180
- 5.In which of the following examples is the motion of the car not accelerated?
- A.
A car turns a corner at the constant speed of 20 km/h
- B.
A car climbs a steep hill with its speed dropping from 60 km/h at the bottom to 15 km/h at the top
- C.
A car climbs a steep hill at the constant speed of 40 km/h
- D.
A car climbs a steep hill and goes over the crest and down on the other side, all at the same speed of 40 km/h
- 6.Two objects have the same size and shape but one of them is twice as heavy as the other. They are dropped simutaneously from a tower. If air resistance is negligible,
- A.
The heavy object strikes the ground before the light one
- B.
They strike the ground at the same time, but the heavy object has the higher speed
- C.
They strike the ground at the same time and have the same speed
- D.
They strike the ground at the same time, but the heavy object has the lower acceleration because it has more mass.
- 7.The acceleration of a stone thrown upward is
- A.
Greater than that of a stone thrown downward
- B.
The same as that of a stone thrown downward
- C.
Less than that of a stone thrown downward
- D.
Zero until it reaches the highest point in its path
- 8.You are riding a bicycle at constant speed when you throw a ball vertically upward. It will land
- A.
In front of you
- B.
On your head
- C.
Behind you
- D.
Any of the above, depending on the ball's speed.
- 9.WHen an object is accelerated,
- A.
Its direction never changes
- B.
Its speed always increases
- C.
It always falls toward the earth
- D.
A net force always acts on it
- 10.If we know the magnitude and direction of the net force on an object of known mass, Newton's second law of motion lets us find its
- A.
Position
- B.
Speed
- C.
Acceleration
- D.
Weight
- 11.The weight of an object
- A.
Is the quantity of matter it contains
- B.
Is the force with which it is attracted to the earth
- C.
Is basically the same quantity as its mass but is expressed in different units
- D.
Refers to its inertia
- 12.Compared with her mass and weight on the earth, an astronaut on Venus, where the acceleration of gravity is 8.8 m/s^2, has
- A.
Less mass and less weight
- B.
Less mass and the same weight
- C.
Less mass and more weight
- D.
The same mass and less weight
- 13.The earth and the moon exert equal and opposite forces on each other. The force the earth exerts on the moon
- A.
Is the action force
- B.
Is the reaction force
- C.
Can be considered either as the action of as the reaction force
- D.
Cannot be considered as part of an action-reaction pair because the forces act in opposite directions
- 14.A car that is towing a trailer is accelerating on a level road. The magnitude of the force the car exerts on the trailer is
- A.
Equal to the force the trailer exerts on the car
- B.
Greater than the force the trailer exerts on the car
- C.
Equal to the force the trailer exerts on the road
- D.
Equal to the force the road exerts on the trailer
- 15.When a boy pulls a cart, the force that causes him to move foward is
- A.
The force the car exerts on him
- B.
The force he exerts on the cart
- C.
The force he exerts on the ground with his feet
- D.
The force the ground exerts on his feet
- 16.In order to cause something to move in a circular path, it is necessary to provide
- A.
A reaction force
- B.
An inertial force
- C.
A centripetal force
- D.
A gravitational force
- 17.An object is moving in a circle with a constant speed. Its acceleration is constant in
- A.
Magnitude only
- B.
Direction only
- C.
Both magnitude and direction
- D.
Neither magnitude nor direction
- 18.A car rounds a curve on a level road. The centripetal force on the car is provided by
- A.
Inertia
- B.
Gravity
- C.
Friction between the tires and the road
- D.
The force applied to the steering wheel
- 19.The centripetal force that keeps the earth in its orbit around the sun in provided
- A.
By inertia
- B.
By the earth's rotation on its axis
- C.
Partly by the gravitational pull of the sun
- D.
Entirely by the gravitational pull of the sun
- 20.The gravitational force with which the earth attracts the moon
- A.
Is less than the force with which the moon attracts the earth
- B.
Is the same as the force with which the moon attracts the earth
- C.
Is more than the force with which the moon attracts the earth
- D.
Varies with the phase of the moon
- 21.The speed needed to put a satellite in orbit does not depend on
- A.
The mass of the satellite
- B.
The radius of the orbit
- C.
The shape of the orbit
- D.
The value of g at the orbit
- 22.An astronaut inside an orbiting satellite feels weightless because
- A.
He or she is wearing a space suit
- B.
The satellite is falling toward the earth just as fast as the astronaut is, so there is no upward reaction force on him or her
- C.
There is no gravitational pull from the earth so far away
- D.
The sun's gravitational pull balances out the earth's gravitational pull
- 23.A bicycle travels 12 km in 40 min. Its average speed is
- A.
0.3 km/h
- B.
8 km/h
- C.
18 km/h
- D.
48 km/h
- 24.Which one or more of the following sets of displacements might be able to return a car to its starting point?
- A.
5, 5, and 5 km
- B.
5, 5, and 10 km
- C.
5, 10 and 10 km
- D.
5, 5, and 20 km
- E.
A, B, and C
- 25.An airplane whose airspeed is 200 km/h is flying in a wind of 80 km/h. The airplane's speed relative to the ground is between
- A.
80 and 200 km/h
- B.
80 and 280 km/h
- C.
120 and 200 km/h
- D.
120 and 280 km/h
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