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Physics Midterm review

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  • How fast is a freely falling object going when it falls for 9 seconds?
    90 m/s
  • A rocket can fly into space because what pushes on the rocket?
    The exhaust gases
  • An object in motion wants to stay in motion, and an object at rest wants to stay at rest, is a way of stating _______________________________.
    Newton's first law
  • A speeding truck makes contact with a bug on its windshield. Compare the force that the bug exerts on the truck to the force the truck exerts on the bug.
    Forces are the same for both
  • The kinetic energy of an object depends upon two things: ____________________ and ____________________.
    mass and velocity
  • In space, does an object have mass?
    YES
  • A 20-kg block of cement is pulled upward (not sideways!) with a force of 400 N. What is the acceleration of the block?
    10 m/s/s
  • The metric unit of mass, distance and time preferred by scientists are the:
    kilogram, meter, second
  • Convert 150 cm to meters
    1.5 meters
  • The slope of a speed versus time graph represents the...
    acceleration
  • Emma walks to school at a speed of 3 miles per hour. If it takes her 20 minutes to walk from home to school, how many miles away is the school from her house?
    1 mile
  • If the net force acting on a moving object is zero, the object will do what in regards to speed and direction?
    continue in the same direction with no change of speed.
  • The graph below represents the motion of a moving vehicle. What is the speed of the vehicle during the time interval from t = 2.0 seconds to t = 4.0 seconds?
    10 m/s
  • Speed with a direction is called ______________________.
    velocity
  • A measured quantity that is described by stating a size and a direction is called a:
    Vector
  • A Net force on an object of 10 kg is 10 N. What is the acceleration of the object?
    1 m/s/s
  • The Newton is defined as the force of that can give a ______kg object an acceleration of ________ m/s/s,
    1
  • The weight of a 10 kg object is....
    100 Newtons
  • Doug rides a motorcycle at an average speed of 42 miles per hour for 3.6 hours. The distance he travels is about ____ miles.
    151 miles
  • What does the gradient mean on a distance time graph?
    Speed
  • Convert 200 cm to meters
    2 meters
  • An object accelerating toward Earth under only the influence of the force of gravity is said to be in ____________________ (two words).
    free fall
  • Terminal speed occurs when:
    force of gravity (weight) = air resistance up
  • An object at constant speed means the sum of the forces =
    Zero
  • If you exert the same force on Earth that Earth exerts on you, why doesn’t Earth move up to meet you when you jump off its surface?
    it has too much mass
  • When you are seated in a chair, the force exerted by you on the chair is called the:
    weight
  • Name THREE physics scientists...
    Aristotle, Einstein, Newton, Joule, Watt, Hooke, Bohr, Rutherford, Millikin,
  • A word meaning “size”often used to describe scalar quantities is:
    magnitude
  • The inertia of two objects must be the same if the same force causes the same ____?
    acceleration
  • If I lift up a brick, I am lifting up the _______ of the object.
    weight
  • What is the speed of a 5 kg object falling to the bottom of a 5 meter tall hill?
    10 m/s
  • The rate of change in the speed of an object is known as:
    acceleration
  • What does a horizontal line on a speed time graph mean?
    Constant speed
  • What equation is associated with hookes law?
    F=ke
  • According to Figure 2-1A, what is the speed of the 2.0-kilogram mass when the time equals 5 seconds?
    3 m/s
  • An unbalanced force of 30 N gives an object an acceleration of 6.0 m/s2. What force would be needed to give it an acceleration of 1.0 m/s2?
    5 N
  • The pulling force that always acts along the direction of the rope in a pulley system is called ____________________.
    Tension
  • If you know the distance traveled and the amount of time it took, speed may be calculated by:
    dividing distance by time
  • F = ma relates to what law?
    Newton's Second law
  • The weight of a 10 Newton object is .....
    10 Newtons
  • Gwen rides her bicycle 2.4 kilometers up a steep hill in 8 minutes. Her speed is ____ kilometers per minute.
    0.3 km/min
  • The diagram below represents a box sliding down an incline: The force of friction acting on the box is directed toward:
    2
  • If there are two forces on an object, 20 N and 30 N, what are the MINIMUM and MAXIMUM resultants possible?
    10 N and 50 N
  • The metric unit of force preferred by scientists is the:
    Newton
  • A man has a mass of 66 Kilos. what is his weight on Earth?
    660 N
  • When you drop a sheet of crumpled paper and a sheet of flat paper off a table at the same time, why does the flat sheet of paper hit the ground later?
    air friction
  • What concept: Two forces cancelling each other out, so they exist, but they add up to zero.
    Vector addition or equilibrium
  • The slope of a distance time graph is the ____________.
    average speed
  • When you are seated in a chair, the force exerted on you by the chair is called the:
    Normal force
  • The motion of an object will continue in the same direction at the same speed unless the object is acted upon by a(n) ____________________.
    unbalanced force
  • A skydiver reaches an instantaneous velocity of 88.2 meters per second before opening his parachute. How long was he in free fall?
    9 seconds
  • A Net force on an object of 10 kg is 10 N. What is the acceleration of the object?
    1 m/s/s
  • What is the strongest structural shape?
    Triangle
  • A 60-kg person on in-line skates pushes against a wall with a force of 30 N and recoils. What acceleration does that person experience?
    0.5 m/s/s
  • Which is bigger, a 100 centimeters or 1000 millimeters?
    They are the same
  • What is the weight in newtons of a 15-kilogram toddler on Earth?
    150 N
  • The slope of a distance time graph is the object's....
    average velocity
  • For every action there is a (n) ________ and opposite reaction, and is the basis for what law?
    equal / Newton's third law
  • Two forces are applied to a 2.0-kilogram block on a frictionless, horizontal surface, as shown in the following diagram. What is the acceleration (speed and direction).
    3 m/s/s right
  • if a am moving at 50 m/s and a force stops me in 5 seconds, my acceleration is (be careful sign matters and unit matters)
    -10 m/s/s
  • What does hookes law state?
    The stretch of a spring is directly proportional to the force applied to it, providing the limit of proportionality is not exceeded.
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