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7th Sharma_Ron PS > Test - Forces > Flashcards

Test - Forces Flashcards

1
Q
  1. A firefighter feels the hose pushing backwards onto him as he uses it to put out the fire. What is the most likely cause of this?
A

The escaping water exerts an equal and opposite force on the hose. NB 22

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2
Q
  1. An object in motion with no unbalanced forces acting on it will…
A

Continue to move in its path at a constant speed. NB 26

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3
Q
  1. For any object, the greater the force that’s applied to it, the greater its will be.
A

Acceleration. NB 22

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4
Q
  1. The size of the gravitational force between two objects depends on their .
A

Masses and distance between them. NB 28

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5
Q
  1. When two forces on the same object are equal and opposite, these forces are called forces.
A

Balanced. NB 21

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6
Q
  1. Compared to the inertia of a 2.0 kg ball, the inertia of a 4.0 kg ball is .
A

Twice as great. NB 17

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7
Q
  1. Consider a watermelon that starts from rest and is dropped straight down from a tall building. Air resistance can be ignored. What is a statement that can be false?
A

The watermelon falls with a constant velocity. NB 26

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8
Q
  1. An object that is falling freely has a constant what?
A

Acceleration. NB 23

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9
Q
  1. A student drops a feather and rock at the same time from Mrs. Taylor’s window. If air resistance wasn’t a factor, what should she observe?
A

The rock and feather fall at the same rate. NB 28

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10
Q
  1. A note card is placed on top of a cup and a penny is on top of the notecard. If you flick the cup, why does the penny not go with the card and and just drops down into the cup?
A

Inertia. NB 21

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11
Q
  1. Which I’d Newton’s laws is the following sentence: An object will move at a constant velocity unless an unbalanced force acts upon it.
A

Newton’s first law. NB 23

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12
Q
  1. What is the push or pull one body exerts on another?
A

Force. NB 20

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13
Q
  1. What is the tendency of an object to resist changes in motion?
A

Inertia. NB 24

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14
Q
  1. Which law is this: A net force acting on an object causes the object to accelerate in the direction of the net force.
A

Newton’s 2nd law. NB 26

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15
Q
  1. What is related to the amount of force needed to change an object’s motion?
A

Momentum. NB 28

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16
Q

38c. Why does terminal velocity occur?

A

Air resistance and gravity are balanced. NB 29

7th Sharma_Ron PS (8 decks)

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