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2017 Physics > Conceptual questions test 1 > Flashcards

Conceptual questions test 1 Flashcards

1
Q

Who discovered the 3 laws of mechanics and the law of gravity?

(a) Kepler
(b) Newton
(c) Ptolemy
(d) Copernicus
(e) Galileo

A

B.

Newton

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2
Q
  1. You throw a football to a friend, what is the velocity of the football when it reaches its
    maximum height?
    (a) 0 m/s
    (b) 10 m/s downward
    (c) 10 m/s upward
    (d) The same as its horizontal velocity at that time
    (e) 10 m/s horizontally
A

d,

The same as its horizontal velocity at that time

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3
Q
  1. A 2 kg ball and a 20 kg ball are held at a height h=2 m above the ground. Which one
    has the greater gravitational potential energy (GPE)?
    (a) The 2 kg ball
    (b) The 20 kg ball
    (c) They both have the same GPE
A

B.

the 20 kg ball since it can overcome more air resistance and would have a harder impact due to weight

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4
Q
  1. Two kids are sitting at the center of a merry-go-round as it spins horizontally. What
    happens to the speed of the merry-go-round if one child moves to the outer edge?
    (a) It speeds up
    (b) It slows down
    (c) Conservation of angular momentum means that it spins at the same rate
A

b

It slows down

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5
Q
  1. Two kids are sitting at the center of a merry-go-round as it spins horizontally. What
    happens to the rotational inertia of the merry-go-round if one child moves to the outer
    edge?
    (d) It gets larger
    (e) It gets smaller
    (f) It stays the same
A

It gets larger

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6
Q
  1. Who is considered the father of modern science?
    (a) Kepler
    (b) Newton
    (c) Ptolemy
    (d) Copernicus
    (e) Galileo
A

e.

Galileo

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7
Q
  1. Which force is usually stronger?
    (a) Static friction
    (b) Kinetic friction
    (c) They are always the same
A

a.

Static friction

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8
Q
  1. You drop two water balloons from your dorm; one from the 2nd floor and one from
    the 5th floor. Which water balloon has the greater acceleration?
    (a) The one dropped from the 2nd floor
    (b) The one dropped from the 5th floor
    (c) They both have the same acceleration
A

c.

They both have the same acceleration

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9
Q
  1. You drop two water balloons from your dorm; one from the 2nd floor and one from
    the 5th floor. Which water balloon has the greater kinetic energy right before the ground?
    (a) The one dropped from the 2nd floor
    (b) The one dropped from the 5th floor
    (c) They both have the same acceleration
A

b.

The one dropped from the 5th floor.

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10
Q

Who is known as the “Father of modern physics”?

A

Galileo

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11
Q

Who made the first detailed measurements of the motion of a planet?

A

Brahe

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12
Q

Who discovered the 3 laws of mechanics and the law of gravity?

A

Newton

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13
Q

Who discovered the laws of planetary motion?

A

Kepler

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14
Q

These are all examples of _______:
Shaking your hands after washing to remove water; stomping your feet on the ground to
remove snow from your shoes; pulling the cloth out from under the dishes.

A

Inertia

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15
Q

What quantity is a measure of somethings inertia?

A

Mass

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16
Q

Does a falling object fall the same distance during each second that it if falling?

A

Not until terminal speed

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17
Q

What is the acceleration of a projectile while it is rising and falling?

A

10m/s downward

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18
Q

Projectile

A

A projectile is an object that is given an initial velocity and then moves under the influence of gravity alone

19
Q

To hit the center of a target, where should a rifle be aimed?

A

Above the middle to account for gravity

20
Q

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

A

Newtons second law

21
Q

Acceleration units

A

m/s^2

22
Q

3 non contact forces

A

Magnetism, Gravity, Electric force

23
Q

A box of weight W rests on the floor. Identify the action/reaction forces acting on the box.

A

The box exerts a downward force on the floor equal to its weight, and the floor exerts an equal upward force on the box. Thus the weight of the box and the upward force of the floor on the box form an action/reaction pair.

24
Q

Does the kinetic energy of an object depend on which direction it is moving?

A

No, KE is a scalar quantity

25
Q

Elastic collision

A

In an elastic collision, the total kinetic energy of the objects before and after the collision is
the same.

26
Q

Inelastic collision

A

In an inelastic collision the kinetic energy is not the same, it is usually less after
the collision

27
Q

Totally inelastic collision

A

In a totally inelastic collision, the objects stick together after they collide. In a
totally inelastic collision, the loss of kinetic energy is as large as possible

28
Q

In a class demonstration a tennis ball on top of a basketball are dropped. When the basketball hits the ground, the tennis ball strongly rebounds upward. Why?

A

The tennis ball gets a big “kick” because its mass is much less than the mass of the basketball.

29
Q

What is the definition of WORK? In what units is it measured?

A

In physics work is done when a force is applied to an object to move it through a certain distance. The work is the force x the distance.Units Work in Joules (J),Force in Newtons, and distance in meters. One Joule (J) is one N x 1 m

30
Q

You lift a heavy weight over your head and hold it there. When are you doing work?

A

When you lift it up and movement occurs.(F*Distance)

31
Q

You carry a 200 N weight over a distance of 7 m. How much work do you do?

A

No work, because the force and motion are in different directions

32
Q

What is the physics definition of a machine?

A

A machine is any device that allows us to accomplish a task more easily. Reduces work.

33
Q

If you throw a ball upwards what is the Potential energy at the top right before it starts falling

A

PE=mgh

34
Q

Is energy stored in a compressed or stretched spring?

A

Both, work must be done to get them to this state and once released the PE turns to KE.

35
Q

A child swings a ball attached to a string in a circle at a constant speed. Is the ball
accelerating and if so what force provides this acceleration?

A

The ball is accelerating and the force that provides the acceleration is the tension in the string.

36
Q

ac is

A

centripetal force

37
Q

What maximum torque could be applied with a force of 50 N using a crowbar that is 1 m
long?

A

1m*50N= 50 N

38
Q

If the net force on an object is zero, do this imply that the net torque must also be zero?

A

No, you could have opposing forces with different levels of force and different levels of torque

39
Q

What factors determine the rotational inertia of an object?

A

The rotational inertia of an object depends on its mass and how the mass is distributed relative to the axis of rotation.

40
Q

What is the law of conservation of rotational momentum?

A

In the absence of any external torques, the total rotational momentum of a rigid body is a constant (conserved).

41
Q

Two metal spheres, one that is hollow and one that is solid are constructed of different materials but have the same mass and diameter. If the spheres roll down an inclined plane from the same initial height, which one will reach the bottom of the incline first?

A

The Solid one, because its smaller rotational inertia.

42
Q

Why does a spinning ice skater spin faster when she pulls her arms in close to her body?

A

When a spinning skater pulls her arms in close to her body, she lowers her rotational inertia.

43
Q

Why is a bicycle stable when it is moving but tends to tip over when it stops?

A

A spinning bike wheel has rotational momentum which is conserved both in magnitude and direction. So while the bike is moving and the wheels are rotating, the tendency to preserve the rotational momentum keeps the bike from tipping over. When the bike is not moving, it
has no rotational momentum.

2017 Physics (7 decks)

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