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Physics 11 > mc qs > Flashcards

mc qs Flashcards

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1
Q

under what condition is the average velocity equal to the instantaneous velocity?

A

when an object is moving with constant velocity

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2
Q

for a car moving fwd and then right, how does the avg speed compare to the avg velocity?

A

the avg velocity is larger bc the magnitude of the displacement is greater than the distance

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3
Q

a bat hit the ball in the air, the time the ball takes before it hits the ground depends on the…

A

the angle and the initial speed with which the ball is hit

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4
Q

true or false:

the instantaneous velocity at a particular time is the slope of the displacement-time curve at that position

A

False

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5
Q

true or false:

an object can be in free fall after it is dropped or after it is thrown upwards

A

true

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6
Q

true or false:

the addition of 2 displacement vectors depends on the order in which they’re added

A

false

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7
Q

true or false:

if the velocity vector of an object changes only in direction, the avg acceleration is zero

A

false

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8
Q

true or false:

for a ball thrown in a parabolic path, the y-comp of velocity is at the highest point in its trajectory is = to 0

A

true

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9
Q

true or false:

the velocity of 2 cyclists relative to each other, if they’re moving in the same direction with equal speed of 20 m/s is 0

A

true

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10
Q

the speed of an object moving in a straight line increases from 10 m/s to 20 m/s in 2s. What is the avg acceleration?

A

5 m/s^2 in the direction of motion of the object

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11
Q

the motion of a projectile… at a particular instant, the magnitude of the hor. comp. of velocity is 5 m/s and the magnitude of the vertical comp is 8m/s. What do you know about the object?

A

the projectile is ascending

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12
Q

a river flows 8m/s(N) relative to the bank. A boat travels 6m/s(E) relative to the river. What is the magnitude of the velocity of the boat relative to the bank?

A

10 m/s

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13
Q

true or false:

speed is always a positive quantity or zero, but never negative

A

true

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14
Q

true or false:

when a moving object starts to slow down on a straight track, the avg acceleration of the object at any time interval after it starts slowing down is positive

A

false

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15
Q

true or false:

when 2 displacement vectors of equal magnitude are aligned opposite to each other, the resultant displacement is zero

A

true

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16
Q

true or false:

a ball thrown hor. from a cliff is an example of projectile motion

A

true

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17
Q

can two displacement vectors of the same length have a vector sum of zero?

A

yes

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18
Q

a skier jumps off a ramp, in this case, air resistance is not negligible. How will air resistance affect the range and the speed with which she lands on the ground?

A

both decrease

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19
Q

a pitcher throws a ball, after the ball has left his hand and is moving through the air, which forces are acting on the ball?

A

a force exerted by air and the downward force of gravity

20
Q

a person with a mass of 62kg is in an elevator moving at a constant velocity of 2.3 m/s(up). What is the magnitude of the net force acting on the person?

A

0N

21
Q

when the net force acting on an object is doubled, the effect on the acceleration of the object will be…

A

doubled

22
Q

An object is suspended from a spring balance in an elevator. The reading is 240 N when the elevator is at rest. The spring balance reading changes to 220 N. Which of the following describes how the elevator is moving?

A

downward with increasing speed

23
Q

a child with mass m is sliding down a slide that is inclined at an angle above the hor. The magnitude of the normal force on the child is…

A

mg cos theta

24
Q

when the normal force is doubled, the coefficient of friction is…

A

unchanged

25
Q

true or false:

a golf ball on the moon has the same inertia as it has on Earth

A

true

26
Q

true or false:

according to the 3rd law, the forces of action and rxn always act on the same body and balance each other

A

false

27
Q

inertia of an object is directly proportional to its…

A

mass

28
Q

when a constant net force acts on an object, which quantity remains constant?

A

acceleration

29
Q

action and rxn forces…

A

act on 2 different objects

30
Q

The tension in a cable supporting a beam at a construction site is less than the weight of the beam. The beam may be…

A

going up or down with non-uniform velocity

31
Q

a bike brakes suddenly, and the wheels skid across the ground, the force of friction b/w the wheels and the ground acts…

A

bwd on both wheels

32
Q

true or false:

if only 3 forces of equal magnitude act on an object, the object must have a non-zero net force.

A

false

33
Q

true or false:

when you pull up on an object at rest on a hor. surface, you decrease the normal force on the object but not the weight of the object

A

true

34
Q

how does the acceleration of a non-inertial frame of reference cause objects in the frame to move?

A

as if a force were acting on them

35
Q

a car moves around a banked curve at a constant speed over black ice with no friction, what causes the car to accelerate?

A

hor. component of the normal force

36
Q

when will a bathroom scale with nothing on it read zero?

A

in space

37
Q

true or false:

for two objects moving in the same circular path with different speeds, the faster object experiences less centripetal acceleration

A

false

38
Q

true or false:

when 2 objects move in the same circular path with the same speed, the heavier object requires a greater centripetal force

A

true

39
Q

true or false:

earth’s surface is an example of a rotating non-inertial frame of reference

A

true

40
Q

inertial frame of reference

A

newtons 1st law holds true

41
Q

true or false:

an amusement park ride moving down with a constant velocity is an example of a non-inertial frame of reference

A

false

42
Q

true or false:

an observer looking down on a passenger in a car driving around a sharp curve would see that the passenger is being pushed by the car in the direction of the curve

A

true

43
Q

true or false:

the moon is not an example of an object in uniform circular motion

A

false

44
Q

true or false:

a rollercoaster car in free fall has no apparent weight

A

true

45
Q

two cars with the same mass are driving around a curved road at different velocities, which car will experience a greater centripetal force, the one moving with the faster velocity or the moving with the slower velocity?

A

faster

46
Q
A

Physics 11 (30 decks)

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