The speed of an object in a certain direction. [Blank] is different from speed because it must have a specific direction. A stationary object has zero [blank].
velocity
The amount of matter in an object; [blank] is measured in the standard unit of kilograms (kg); An object's [blank] does not depend on gravity
mass
A force that resists an object's motion. [Blank] is a contact force. It is larger on rough or sticky surfaces.
friction
A force without an equal and opposite force acting on the same object; [blank] forces change an object’s motion (velocity) or shape
unbalanced [force]
How far an object has travelled. [Blank] is calculated by multiplying average speed by time.
distance
A representation of all the forces acting on an object. The object is represented as a box. The forces acting on it are drawn as arrows radiating from the box. [blank blank blank]
free body diagram
An object has a constant velocity unless acted on by a net force. An object will keep moving at the same speed in the same direction unless acted on by a net force (law of inertia).
first [law of motion]
Any change in velocity. [Blank] is any change in speed or direction. It is measured in metres per second per second (m/s/s).
acceleration
A change in velocity due to [blank] force. The acceleration due to [blank] is the same for all objects on the Earth's surface – about 10 m/s/s downward.
gravity
A force that [blank] an object's motion through air. Air [blank] is a contact force caused by collisions between the object and air molecules.
resistance
The overall force on an object; The [blank] force is calculated by cancelling out any balanced forces and adding or subtracting the remaining forces
net [force]
The natural tendency of an object to maintain a constant velocity. Any object will stay at rest, or keep moving at the same velocity, unless acted on by a net force.
inertia
The rate of change of an object's position. [Blank] is calculated by measuring the distance travelled during a certain time.
speed
A push or pull. [Blank] are measured in newtons (N). They cause objects to accelerate.
force
How fast an object is moving at a single moment. The speedometer in a car shows the car's [blank] speed.
instantaneous
Net force equals mass times acceleration; An object's acceleration is directly proportional to the net force acting on it, and inversely proportional to its mass; [blank] law of motion
second law of motion
A force with an equal and opposite force acting on the same object. [Blank] forces cancel out and do not cause an object to accelerate.
balanced
Every force has an equal and opposite reaction force; Forces always come in pairs of the same size and type, but acting on different objects in opposite directions; [blank] law of motion
third law of motion
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