True or False?
Motion occurs when there is a change in speed.
False
Motion occurs when there is a change in position.
100
What is Newton's 1st law?
An object at rest stays at rest and an object in motion stays in motion, so long as the forces on the object are balanced.
100
What is gravity?
An attraction between two objects.
100
What is the symbol and unit for mass?
m, and kg
200
The speed and direction of an object is its ______________.
Velocity.
200
True or False
Acceleration occurs when there is a change in velocity.
True
200
What is Newton's 2nd Law?
F=ma
200
What two things does gravity depend on?
Mass and distance between objects.
200
What is the symbol and unit for velocity?
v, and m/s
300
Acceleration occurs when _______________ or ______________ changes.
speed, direction
300
True or False
When you roll a ball up a hill, it undergoes a positive acceleration.
False, it undergoes a negative acceleration.
300
What is Newton's 3rd Law?
For every action, there is an equal but opposite reaction.
300
What is the acceleration of a free falling object due to gravity on Earth?
9.8 m/s2
300
What is the symbol and unit for distance?
d, and meter
400
When calculating acceleration, subract ______ - ______ and then divide by time.
Vf - Vi
400
When the forces on an object are unbalanced, the net force is zero.
False, the forces would have to be balanced for the net force to be zero.
400
If the forces acting on an object are _________________, the object will remain at rest.
balanced
400
Does gravity increase or decrease on the Moon?
Decrease
400
What is the symbol and unit for force?
F, and Newton
500
If an object is sitting still and is propelled forward with 100 N of force, travels for 63 meters and then falls off a cliff, reaching terminal velocity at 100 m/s, what is its initial velocity?
0 m/s
500
True or False
In a car crash, inertia is what causes a person to crash into the windshield.
True
500
How do seatbelts save lives? Which Newton's Law is this?
Seatbelts stop a person's motion when the car's motion is stopped. This is best described by Newton's 1st law.
500
If you drop a ton of feathers and a ton of bricks on the Moon, which one will hit first?
They will hit at the same time, there is no air resistance on the moon. (masses are equal, accelerations are equal)