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# Forces & Motion

### IGCSE Physics - Forces and Motion

Question | Answer |
---|---|

Define the average speed equation | v=d/t |

Rearrange the average speed equation to calculate Distance | d=v*t |

Rearrange the average speed equation to calculate Time | t=d/v |

Define the acceleration equation | a=v-u/t |

Rearrange the acceleration equation to calculate initial speed | u=v-a*t |

What is the standard unit of mass? | kg |

What is the standard unit of time? | s |

What is the standard unit of speed? | ms^-1 |

What is the standard unit of acceleration? | ms^-2 |

What is the standard unit of force? | N |

What is the standard unit of momentum? | kg/ms^-2 |

What is the standard unit of distance? | m |

What is the full name of the standard unit: ms^-1 | metre per second |

What is the full name of the standard unit: m | metre |

What is the full name of the standard unit: s | second |

What is the full name of the standard unit: kg | kilogram |

What is the full name of the standard unit: ms^-2 | metres per second per second |

What is the full name of the standard unit: u | Starting speed |

What is the full name of the standard unit: t | time |

What is the full name of the standard unit: a | acceleration |

What is the full name of the standard unit: v | final speed OR velocity |

A force can change an object's: V... and S... | Velocity and shape |

What do we call measurements of force which have direction? | Vector |

What do we call measurements of force which don't have direction? | Scalar |

Define the equation for Newton's second law of motion | F=m*a |

Rearrange Newton's second law of motion equation to find the mass | m=F/a |

Rearrange Newton's second law of motion equation to find the acceleration | a=F/m |

Rearrange Newton's second law of motion equation to find the Weight | W=m*g |

What is the unit to measure Weight? | N |

What is the unit to measure acceleration due to gravity? | ms^-2 |

What term means "falling at a constant speed" | Terminal Velocity |

What is the approximate value of acceleration due to gravity (g)? | 10ms^-2 |

Mass equation in relation to Newton's second law | m=W/g |

Momentum equation | p=m*v |

Mass equation in relation to momentum | m=p/v |

Velocity equation in relation to momentum | v=p/m |

Equation: Force = change in momentum divided by time taken for change | F=(Δp)/t |

Collision equation (where they attach) | v=total momentum/total mass |

Collision equation (where they divide) | Total momentum=m(1)*v(1)+m(2)*v(2) |

Impulse equation | F*t=m*Δv |

Δ | Change |

Pivot | A point around which something rotates |

Moment equation | Moment=F*d |

Moment equation: Forces in same direction | Moment=F(1)*d(1)+F(2)+d(2) |

Moment equation: Forces in opposing directions | Moment=F(1)*d(1)-F(2)+d(2) |

Orbital speed equation | v=(2*π*r)/t |

Final speed equation in relation to acceleration | v=u+a*t |

a |