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1stYearForces
Forces
| Question | Answer |
|---|---|
| Contact forces involve which three things? | Push, pull or twist. |
| If a force is applied to an object, what can change? | The shape of the object, the speed of the object and the direction of an object. |
| Are electrostatic forces contact or non-contact? | Non-contact. |
| Is magnetism a contact or non-contact force? | Non-contact. |
| An object is hit by another and changes direction. Is this a contact or non-contact force? | Contact. |
| Which force stops us from flying off into space? | Gravity. |
| When a balloon is rubbed and causes hair to stand on end, which force is acting? | Electrostatic force. |
| When kneading bread, which types of forces are used? | Contact forces - push, pull or twist. |
| Brakes are used to stop or slow down vehicles. Which force acts here? | Friction. |
| Is friction a contact or non-contact force? | Contact. |
| Maglev trains use magnetism to rise above the tracks. Which force is being reduced here? | Friction. |
| How do geckos overcome gravitational forces to climb walls? | They have tiny hairs on their feet to increase friction. |
| What is the unit of force? | Newtons (N). |
| What device can be used to measure forces? | Newton balance. |
| What do Newton balances contain to measure forces? | A spring. |
| What is a balanced force? | Two forces that are opposite in direction but the same in size. |
| How does an unbalanced force occur? | One of two or more forces must be large than the other. |
| If forces of the same size are acting on an object in opposite directions, what happens? | The forces cancel out. They are balanced. |
| What effect does an unbalanced force have? | It will change shape, speed or direction of an object. |
| 50 N --> [] <--25 N What is the resulting force? | <--25 N |
| 25 N --> [] <--25 N What is the resulting force? | There is no force. They are balanced. |
| 60 N --> [] <--40 N What is the resulting force? | 20 N --> |
| 60 N <-- [] <--40 N What is the resulting force? | <-- 100 N |
| What causes friction? | Surfaces pressing against each other. |
| If a smooth object is on a smooth surface, is the friction low or high? | Low |
| If a rough object is on a rough surface, is the friction low or high? | High |
| On a bike, where is friction desirable? | Handlebars, brakes, pedals, wheels. |
| How can changing an objects shape decrease friction? | By streamlining and smoothing or reducing surface areas. |
| How can a cyclist reduce their drag? | By crouching over the handlebars to become more streamlined. |
Created by:
DrLEC121
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