Net Force
Types of Force
Calculations
Weight, Mass, and Gravity
Vocabulary
100
When the net force on an object is 0, forces are __________________________________
Balanced
100
Gravity is the force that...
pulls us down to Earth
pulls objects with mass toward each other
100
A 5 kg eagle flies at 45 m/s to catch a fish. What momentum does the eagle hit the water with? (INCLUDE UNITS)
225 kg * m/s
100
Which value changes WITH gravity, weight or mass?
Weight
100
Force is defined as a _______________ or ________________ on an object
push or pull
200
When forces on an object are UNBALANCED, the object is ________________
Moving
200
Force that happens when two objects oppose each others' motion
Friction
200
A 110 kg shark slows down at a rate of 3 m/s2 when it hits a submarine in the water. With what force did the bull shark hit the submarine? INCLUDE UNITS.
330 N
330 kg * m/s2
200
Weight is measured in _________________ in physics.
Newtons
200
Speeding up or slowing down
Acceleration
300
Calculate the net force on the following object:
400 N
300
Forward force that an object in motion exerts
Momentum
300
A professional boxer can punch with a force of 3400 N. If they have a mass of 125 kg, how fast is their fist accelerating? INCLUDE UNITS
27.2 m/s2
300
If the Earth's mass decreased by 3 times overnight, we would all weigh ___________________
less
300
Resistance to any change in motion
Inertia
400
Which direction is the following object moving in?
Left
400
Type of friction that occurs when two objects are not moving
Static Friction
400
A rock on Mars weighs 9,250 N. If the acceleration due to gravity on Mars is 3.7 m/s2, how much mass is contained in the rock? INCLUDE UNITS.
2500 kg
400
As a spaceship moves closer to Earth's atmosphere, the Earth exerts _____________ gravity on the spaceship
more
400
Object that is falling, flying, or propelled from a gun/cannon/launcher
Projectile
500
If the Net Force on this object is 800 N, what is the missing force's value?
1000 N
500
Type of friction that happens when you move through a liquid or gas
Fluid Friction
500
A small pebble flies off a bridge, reaches a speed of 90 m/s, and hits a car with enough momentum to shatter the windshield (27 kg * m/s). What was the mass of the pebble?
0.3 kg
500
Where would you weigh less, on top of the Empire State Building or in the New York subway system?
On top of the Empire State Building
500
The total amount of matter (stuff) in an object is its...
mass