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Physics
Section 1 (Forces and Motion)
| Question | Answer |
|---|---|
| Scalar quantities only have ______________ | magnitude |
| Vector quantities have both magnitude AND ____________ | direction |
| Speed is a ____________ quantity | scalar |
| Velocity is a __________ quantity | vector |
| Distance is a __________ quantity | scalar |
| Displacement is a ____________ quantity | vector |
| How fast do sound waves travel through air? | 330 m/s |
| Define acceleration | the rate of change in velocity |
| What is velocity measured in? | m/s |
| What is acceleration measured in? | m/s2 |
| Anything that is dropped will accelerate at a speed of __________, due to the force of gravity | 9.8m/s2 |
| The gradient of a distance/time graph tells us what? | the speed of the object |
| To find the velocity at a point on a curve in a distance/time graph, we need to do what? | Draw a tangent at that point and find it's gradient |
| What does the area under the curve in a velocity/time graph show? | the distance travelled in that time |
| What is Newton's First Law of Motion? | A resultant force is required to change the motion of an object |
| What is the first part of Newton's Second Law of Motion? | If a non-zero resultant force acts on an object, it will cause the object to accelerate |
| Why can we say the moon is always accelerating? | Because it is constantly changing direction, despite maintaining the same speed. Acceleration is defined as the rate of change in velocity and since direction is part of velocity, the moon is always accelerating |
| What is the second part of Newton's Second Law of Motion? | The size of the resultant force is directly proportional to the acceleration it causes |
| What is the definition of inertia? | The tendency for the motion of an object to remain unchanged |
| What does inertial mass tell us? | How difficult it is to change an object's velocity |
| What is Newton's Third Law of Motion? | When two objects interact, the forces they exert on each other are equal and opposite |
| What does it mean when an object is at an equilibrium? | No resultant force is acting on the object |
| What is another name for air resistane? | Drag |
| If an object RETURNS to its original shape after forces have been removed, what type of deformation is it? | Elastic deformation |
| If an object DOESN'T RETURN to its original shape after forces have been removed, what type of deformation is it? | Inelastic deformation/plastic deformation |
| On a force/extension graph, what is the point called where the line starts to bend? | Elastic limit/limit of proportionality |
| What are the three effects of forces? | 1. Change in speed 2. Change in direction 3. Change in shape |
| When an object is past the elastic limit, it becomes ______________________ | Inelastically deformed |
| An object's ____________________ is a measure of how many Newtons of force it would require to stretch (or compress) the object by 1 metre | spring constant |
| What is the formula for Hooke's Law? | F = ke |
| What 2 factors affect thinking distance? | 1. How fast you're going 2. Your reaction time |
| What 4 factors affect braking distance? | 1. How fast you're going 2. The mass of the vehicle 3. How good your brakes are 4. How good the grip is |
| What are 4 factors that can affect reaction time? | 1. Tiredness 2. Drugs 3. Alcohol 4. Old age |
| What 3 factors affect how good the grip is for the vehicle? | 1. Road surface 2. Weather conditions 3. Tyres |
| What is the equation for momentum? | momentum = mass x velocity |
| What type of quantity is momentum? | Vector |
| What is momentum measured in? | Kg m/s |
| What does the conservation of momentum principle state? | In a closed system, the total momentum before an event is equal to the total momentum after the event |
| What are the 2 force equations? | Force = Change in momentum/time OR Force = final momentum - initial momentum/ time |
| What designs do cars have to increase the time it takes the car to slow down in a crash? | Crumple zones, seat belts, air bags |
| If an object obeys Hooke's Law then force and extension will be ______________________ | directly proportional |
Created by:
JoeMather
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