Difference between revisions of "Weight"
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===About Weight=== | ===About Weight=== | ||
| + | : Weight is a [[force]] so it is [[Measure|measured]] in [[Newton]]s. | ||
| + | : Weight is a [[Non-contact Force|non-contact force]]. | ||
: Weight always acts downwards. | : Weight always acts downwards. | ||
: All [[object]]s on [[Earth]] have [[weight]] because the [[Earth]] has a [[Gravitational Field|gravitational field]]. | : All [[object]]s on [[Earth]] have [[weight]] because the [[Earth]] has a [[Gravitational Field|gravitational field]]. | ||
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| style="height:20px; width:200px; text-align:center;" |Planes can be very heavy but their [[weight]] is [[Balanced Forces|balanced]] by the [[lift]]. | | style="height:20px; width:200px; text-align:center;" |Planes can be very heavy but their [[weight]] is [[Balanced Forces|balanced]] by the [[lift]]. | ||
|} | |} | ||
| + | |||
| + | ===Equation=== | ||
| + | : Weight = Mass x Gravitational Field Strength | ||
| + | : <math>W = m \times g </math> | ||
| + | Where: | ||
| + | : W = Weight | ||
| + | : m = Mass | ||
| + | : g = Gravitational Field Strength | ||
Revision as of 12:25, 15 October 2018
Contents
Key Stage 2
Meaning
Weight is how heavy or light something is.
About Weight
- Objects have weight because of the gravity of the Earth.
- Weight can be measured using a Newton Meter or a Measuring Scale.
- Weight is measured in Newtons but can also be measured in stone, pounds and ounces.
- Weight depends on the amount of mass an object has.
| Golf Ball | Beach Ball | Bowling Ball |
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| The Golf Ball is not made of much material so it is lightest. | The Beach Ball might be the biggest but it is not the heaviest. | The Bowling Ball is made of the most material, so it is the heaviest. |
Key Stage 3
Meaning
Weight is the the force on an object that is in a gravitational field.
About Weight
- Weight is a force so it is measured in Newtons.
- Weight is a non-contact force.
- Weight always acts downwards.
- All objects on Earth have weight because the Earth has a gravitational field.
- Different planets have a different strength gravitational field, so the same object might weigh a different amount on different planets.
Examples
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| Weight makes a tennis ball fall to the ground. | Weight holds the bowling ball to the ground. | If the weight of a boat were bigger than the upthrust the boat would sink. |
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| The weight of the car acts from its centre of mass. | The submarine has the same weight under the water as it would on land, but in the water this is balanced by the upthrust. | Planes can be very heavy but their weight is balanced by the lift. |
Equation
- Weight = Mass x Gravitational Field Strength
\[W = m \times g \] Where:
- W = Weight
- m = Mass
- g = Gravitational Field Strength