If I run 10 meters in 2 seconds, what is my speed?
5m/s
100
Which law explains why seatbelts are necessary?
1 - inertia: object in motion stays in motion
100
Is there more friction on the sidewalk or on an ice skating rink?
On the sidewalk
100
If there's no air resistance, which object will hit the ground first if dropped at exactly the same time: a feather or a hammer?
They will hit at exactly the same time
100
Is it considered work if I hold my laptop above my head for 10 minutes?
No
200
A car accelerates from a stop to 30m/s in 5 seconds. What is the rate of acceleration?
6m/s^2
200
If I roll a ball down the hallway, what will eventually happen to it?
It will stop when affected by an outside force (friction or the reaction force of hitting something else)
200
If Mr. Frat pushes a box to the RIGHT with a force of 9N and Ms. Diana pushes the box to the LEFT with a force of 8N, what is the net force on the box?
1N to the right
200
What are the two factors that affect the strength of the force of gravity?
Force and distance
200
Is it considered work if I carry a textbook from 601 to 610?
No
300
25m/s. Is this a measure of speed or of acceleration?
Speed
300
Which two laws describe the reason why it is much harder for a school bus to accelerate when a light turns green than for a small car?
1 and 2
1 - an object at rest stays at rest
2 - F=ma
300
Why do most shoes have ridges or bumps on the bottom?
To increase friction between the shoe and the ground
300
Would your weight be greater on Jupiter or on Earth?
On Jupiter
300
Name all 6 simple machines
Inclined plane, lever, wedge, pulley, wheel and axle, screw
400
What does a negative slope on a speed (distance vs. time) graph mean?
You are moving backwards
400
Which law of motion do space shuttles use when taking off?
3rd law: for every action, there is an equal and opposite reaction
400
Why do people need to put oil in their cars?
To reduce the friction between the motor parts
400
What do electromagnetic force (the salt and the balloon...) and gravity have in common?
They are both forces of attraction
400
What do simple machines do?
a) Change the amount of work
b) Change the amount of force
c) Change the direction of force
d) Change the amount and the direction of force
e) All of the above
D - change the amount and direction of force
500
What does a zero slope on an acceleration graph mean?
You are moving at a constant speed (zero acceleration)
500
When mass increases, do you need MORE force, LESS force, or the SAME amount of force to accelerate an object?
More force
500
Why does a car driver have to keep pressing on the gas pedal to maintain constant speed?
(no one word answers, please)
Because friction between the wheels and the street slow the car down
500
If a penny dropped off the roof of a building is traveling at about 30m/s, how long ago did I drop the penny?
3 seconds ago
(Acceleration due to gravity is 9.8m/s^2)
500
How do inclined planes make work easier?
They increase the distance, which decreases the force