P5 - Forces Flashcards

Question

How do you draw a scale diagram of an object in equilibrium

Answer 1

On a scale drawing this means that the tip of the last force you drew food and where the tip of the first force you to began You might be given forces acting on an object and told to find a missing force given that the object is an equilibrium. To do this Draw out the forces you to know, join the end of the last force to the Start of the first force. This line is the missing Force so you can measure its size and direction

Answer 2

Split it into two components-vertical and horizontal component Draw them using a sensible scale Work out the hypotenuse using the scale factor

Answer 3

When you apply a force to an object you may cause it to stretch ,compress or bend To do this you need more than one force acting on the object An object has been elastically deformed if it can go back to its original shape and length after the force has been removed Objects that can be electrically deformed are called elastic objects An object has been inelastically deformed it doesn't return to its original shape and length after the force has been removed Work is done when a force stretches or compresses an object and causes energy to be transferred to the elastic potential energy store of the object All of the energy is transferred to the elastic potential energy store if it is elastically deformed

Answer 4

Extension of a spring is directly proportional to the load or force applied

Answer 5

Where he is just the difference between the neutral and compressed length-the compression

Answer 6

There is a limit to the amount of force you can apply to an object for the extension to keep on increasing Proportionally The object will not return to its original shape and length

Answer 7

Speed and velocity both mega how fast you're going what speed is a scaler and velocity is a vector This means you can have objects travelling at a constant speed with a change in velocity. This happens when the object is changing direction whilst playing at the same speed. If you want to measure the speed of an object that's moving with a constant speed you should time how long it takes to object to travel a certain distance Objects rarely travel at a constant speed

Answer 8

Speed is just how fast you're going with no regards to the direction

Answer 9

Velocity is speed in a given direction

Answer 10

1.5 m/s 3 m/s 6 m/s 30 m/s 25 m/s 250 m/s

Answer 11

It depends on what the sound waves are travelling through and the speed of wind is affected by many factors Windspeed can be affected by things like temperature, atmospheric pressure and if there are any large buildings or structures nearby

Answer 12

Is how quickly your speeding up acceleration is the change in velocity in a certain amount of time Deceleration is just negative acceleration

Answer 13

To do this you need the typical speed of the object

Answer 14

Constant acceleration is sometimes called uniform acceleration acceleration due to gravity is uniform for objects in freefall. It's roughly equal to 9.8 m/s

Answer 15

Gradient = speed (The steeper the graph the faster it's going) = Y axis divided by X axis Flat sections are where it's stationary-it's stopped Straight uphill sections mean it's travelling at a steady speed Curves represent Acceleration or deceleration A steeper curve means it's speeding up A levelling off curve means it's slowing down If the object is changing speed you can find its speed at a point by finding the gradient of the tangent to the curve at that point

Answer 16

Gradient - acceleration Flat sections represent travelling at a steady speed The steeper the graph the greater the acceleration or deceleration Uphill sections are acceleration Downhill sections or deceleration is The area underneath any section of the graph is equal to the distance travelled in that time interval

Answer 17

If any object has no force propelling it along it will always slow down and stop because of fiction Fiction always acts in the opposite direction to the mental To travel at a steady speed the driving forces needs to balance the frictional forces You get friction between two surfaces in contact or when the object passes through a fluid You can reduce friction between services by using a lubricant

Answer 18

Drag is the resistance you get in fluid. Air resistance is a type of drag An important factor by far in reducing drug is keeping the shape of the object streamlined This is where the object is designed to allow fluid to flow easily across it reducing drag. Frictional forces from fluids always increases with speed

Answer 19

When a falling object 1st sets off the force of gravity is much more than the frictional force slowing it down so it accelerates As the speed increases the friction builds up This gradually reduces the acceleration until eventually the frictional force is equal to the acceleration force so the resultant force is zero It will have reached the maximum speed or terminal velocity and will fall at a steady speed

Answer 20

Typically the Less streamline an object is the lower its terminal velocity So objects with large surface area tend to have low terminal velocity Shape

Answer 21

If the resultant force on a stationary object is zero the object will remain stationary. If the resultant force on a moving object is zero it'll just carry on moving in the same velocity (same speed and direction)

Answer 22

The launch of the resisting force acting on an object the more the object accelerates-the force and the acceleration Is directly proportional Exhilaration is also inversely proportional to the mass of the object-so an object with a larger mass will accelerate less than one with a smaller mass

Answer 23

Until acted upon by A resultant force object at rest day stay at rest and objects moveing at a steady speed will stay moving at that speed. This tendency to continue in the same state of motion is called inertia And objects inertia mass measures how difficult it is to change the velocity of an object

Answer 24

When two objects interact the forces they exert on each other are equal and opposite

Answer 25

The distance it takes to stop a car in an emergency

Answer 26

Thinking distance is how far the car travels during the drivers reaction time (the time between the drivers seeing a hazard and applying the brakes)

Answer 27

Braking distance is the distance taken to stop under the braking force (once the brakes are applied)

Answer 28

If you've had alcohol or drugs Age

Answer 29

Your speed-for a given braking force the faster vehicle travels the longer it takes to stop The weather or road surface-if it is wet or icy or there are leaves or are you on the road there is less grip between the vehicles tires and the road which can cause tires to skid Conditions of your tires-if the tires of a vehicle haven't got any presents left then they cannot get rid of water in wet conditions. This leads to them skidding on top of water How good your brakes are-if brakes are worn or faulty they won't be able to apply as much force as well maintained breaks which can be dangerous when you need to break hard

Answer 30

When the brake pedal is pressed this causes brake pads to be pressed onto the wheel. This contact causes friction which causes work to be done.Transfers energy from the kinetic energy store of the wheel to the thermal energy store of the breaks. The break increases in temperature The faster a vehicle is going the more kinetic energy it has and so more work needs to be done to stop at. This means that a greater braking force is needed to make it stop within a certain distance A large braking force means a larger deceleration. Very large deceleration can be dangerous because they may cause breaks to overheat or could cause the vehicle to skin

Answer 31

The greater the mass of an object or the greater its velocity the more momentum the object has Momentum is a Vector quantity

Answer 32

In a closed system the total momentum before an event is the same as after the event If the momentum before and event is zero then the momentum after will also be zero