## Physics - Force & Momentum

### Gap-Filling Quiz

Type the answers (or copy and paste them) into the blank boxes.
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acceleration      before      earth      external      Friction      gravity      impact      kilograms      matter      metre      momentum      motion      newton      opposite      reaction      resistance      slows      squared      three      velocity
The mass of a body is the amount of in it. It is measured in .
A force is anything that changes, or tends to change, the of a body in magnitude or direction. The unit of force is the . One newton is the force that gives a mass of one kilogram an acceleration of one metre per second .
Force = mass x .
The weight of a body is the force with which the attracts that body. Weight = mass x acceleration due to .
Momentum of a body is the product of its mass and its . The unit of momentum is the kilogram per second.
Around 1687, Isaac Newton proposed laws of motion. Every body continues in a state of rest or uniform motion unless some force acts on it. The rate of change of is proportional to the force causing it, and takes place in the direction of that force. To every action, there is an equal and opposite . The principle of conservation of momentum states that where two or more bodies interact, their total momentum impact is equal to their total momentum after , providing there are no forces acting on the system.
is a force between two surfaces that are sliding, or trying to slide, across each other. Friction always down a moving object. Friction always works in the direction from the direction the object is moving, or trying to move. Air is a type of friction.