39549906
Description
Flashcards by Miss C Rodgers, updated more than 1 year ago
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Created by Miss C Rodgers
over 1 year ago
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| Question | Answer |
| What is inertia? | How hard it is to change the motion of an object |
| What is Newton's 1st law? | A body will remain at rest, or travel in a straight line, with a constant speed, unless acted upon by an external resulatant force |
| What does Newton's 1st law tell us about objects moving at a constant velocity? | Resultant force = zero (balanced forces) |
| What is a resultant force? | Overall force acting on an object |
| What is the resultant force? 24N<-- -->39N | 15N --> |
| What is Newton's 2nd law? | Resultant force = mass x acceleration (F=ma) |
| What is the link between force and acceleration | They are directly proporational. As the Force increases, so will the acceleration |
| What is the link between mass and acceleration? | They are inversely proporational. If mass increases, the acceleration decreases |
| What is the definition of mass? | How much matter (stuff) is in an object |
| What is the definition of weight? | Force due to gravity on an object |
| What unit is used for mass? | kg (kilograms) |
| What unit is used for weight? | N (Newtons) |
| What happens to your weight if you go to the Moon? | Weight decreases as there is less gravity |
| What happens to your mass if you go to the Moon? | Stays the same unless you lose a body part on the way! |
| What is the equation that links weight and mass? | Weight = mass x gravitational field strength (W=mg) |
| What is the gravitational field strength on Earth? | 10N/kg |
| What is the weight of a 250kg car on Earth? | 2500N |
| What is Newton's 3rd law? | If object A exerts a force on object B, then object B exerts an equal and opposite force on object A |
| If a bat pushes a ball forwards with 400N what does the ball do? | Ball pushes the bat backwards with 400N |
| Describe how Newton's 3rd law applies to a rocket? | The exhaust gases will exert a force onto the rocket. The rocket will exert a for onto the gases that isequal in size but opposite in direction |
| Why does the acceleration of a rocket change as it flies? | Mass decreases as it uses up fuel |
| When a skydiver first jumps from a plane why do they accelerate? | Weight is bigger than air resistance |
| When a skydiver speeds up what happens to air resistance? | Increases until it balances weight |
| When weight and air resistance are balanced what happens to the motion of the skydiver? | Constant speed (terminal velocity) |
| What happens to the skydiver when they open their parachute? | Air resistance increases and is bigger than weight, so they slow down |
| When a skydiver slows down what happens to air resistance? | Decreases until it balances weight |
| What does terminal velocity mean? | Constant speed due to balanced forces |
| When a skydiver falls which force remains constant? | Weight (N) |
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