Test- Force Flashcards
1
Q
- A fire fighter 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.
2
Q
- If the same force is applied to each of the balls pictured below, which one will have the least acceleration?
A
The bowling ball
3
Q
- The relationship among mass, force, and acceleration is explained by _______.
A
Newtons 3rd Law of Motion
4
Q
- For any objects, the greater the force that’s applied to it, the greater it’s _________ will be.
A
Gravity
5
Q
- The size of the gravitational force between two objects depend on their _________.
A
Masses and distance between them
6
Q
- An astronaut is planning a trip to a newly discovered planet. According to the Law of Universal Gravitation, the astronaut’s weight on the new planet will be greater than his weight on earth if:
A
The new planet has more gravity than earth.
7
Q
- A baseball player swings his bat and misses the ball but hits a fly that was hovering over home plate. The acceleration of the fly compared to what the acceleration of the ball would’ve been with the same force applied to it would be
A
Larger
8
Q
- Consider a watermelon that starts from rest and is dropping straight down from a tall building. Air resistance can be ignored. Which statement about the watermelon’s motion is false?
A
The watermelon falls what a constant velocity.
9
Q
- An object that is falling freely has a constant what?
A
Acceleration
10
Q
- A student drops a feather in 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.
11
Q
- In the picture to the right, if the card were quickly pulled off the cup like the arrow suggest, what property would explain why the coin fell into the cup rather than moving with the card?
A
Inertia
12
Q
- The highest velocity a falling object will reach.
A
Terminal velocity
13
Q
38c. Why does this occur?
A
Gravity and air resistance become balanced
14
Q
What is the y-axis on a distance vs. time graph?
A
d(distance)
