When two forces act in opposite directions they combine by ________. (2.1)
subtract
What is the acceleration of a bowling ball if it has a mass of 4kg and hits the pins with a force of 24N?
6m/s^2
What is Newton's first law of motion? (2.1)
An object at rest will remain at rest and an object in motion will remain in motion
What is the law of conservation of momentum? (2.4)
The total momentum of any group of objects remains the same unless outside forces act on the objects.
What is sliding friction? (2.3)
When surfaces slide over each other
What changes an object's motion? (2.1)
Unbalanced forces
True or false: mass and weight are the same thing.
False
What TWO things does the force of friction depend on? (2.3)
The types of surfaces involved and how hard the surfaces push together
What is rolling friction? (2.3)
When an object rolls over a surface
What is the force that pulls objects toward each other? (2.3)
Gravity
At what force will a car hit a tree if its mass is 4,000kg and its accelerating at 3 m/s^2?
12,000 N
Acceleration and force change in the ______ way. (2.2)
same
What are forces described by? (2.1)
Their magnitude and the direction in which they act
What is Newton's third law of motion? (2.4)
If one object exerts a force on another object, then the second object exerts a force of equal magnitude in the opposite direction on the first object.
When two forces act in the same direction they ____ together. (2.1)
add
What is mass? (2.1)
The amount of matter in an object
What is fluid friction? (2.3 )
When an object moves through a liquid or gas
What is centripetal force? (2.5)
Any force that causes an object to move in a circle
What is friction? (2.3)
The force that one surface exerts on another when they rub against each other.
What is net force? (2.1)
The overall force on an object after all the forces are added together
True or false: an object moving in a circular motion is accelerating.
True
The amount of inertia an object has depends on its ______. (2.1)
mass
What is the formula to find force? (2.2)
Force= Mass X Acceleration
What is the formula for finding momentum? (2.4)
Momentum= Mass X Velocity
What do objects falling through air experience? (2.3)
Air resistance
Solve this problem with how much force and in which direction
What is a force? (2.1)
A push or pull
Acceleration and mass change in _______ ways. (2.2)
opposite