48 Questions
| Attempts: 157

Questions and Answers

- 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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