Topic P2:Forces;Flash Questions

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  • Created by: MiriamL
  • Created on: 28-02-20 13:21
How many metres in a km?
1000
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How man Km in a mile?
1.6
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On a distance time graph what is the gradient of the line?
Speed
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On a distance Time graph what does a steep line mean
Faster speed
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On a distance time graph what does a straight line mean?
Constant speed
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On a distance time graph what does a negative gradient tell?
The object is moving back towards the start
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On a distance time graph what does a horizontal gradient mean?
Speed is zero
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If a direction is assigned positive what is assigned to the opposite direction?
Negative
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What then does negative velocity mean?
Opposite direction to the positive one
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On a velocity time graph what does acceleration at a constant rate equal?
Gradient of the graph
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On a velocity time graph what does a horizontal gradient represent?
Object moving at a constant velocity
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In what two ways can velocity change?
Change in speed, change in direction
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When an object changes direction what does it also do?
It accelerates because acceleration is the rate of change of velocity.
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On a velocity time graph what is distance travelled represented by?
Area under graph
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On a velocity time graph if acceleration is not constant what will the graph look like?
Curved line
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What is weight equal to for all objects resting on a surface
Normal Contact Force
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If the resultant force is zero what happens to the objects velocity?
It stays the same
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What happens if the resultant force is more than zero?
The object will accelerate in the direction of the force
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How do you draw force vectors
With arrows end to end
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How do you get the resultant force
Join the start and finish of the arrows, measure length and direction and convert length to force
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What is Newton’s first law?
An object will remain at rest, or moving with constant velocity unless acted on by a resultant force
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If the resultant force is zero what is the velocity?
Constant
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What is Newton’s second law?
The acceleration of an object is directly proportional to the resultant force and takes place in the direction of the force
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For the same sized force, the larger the mass of the object...
The smaller the acceleration
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Average Velocity =
Distance/time
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Final Velocity=
2*Average Velocity
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Change in Velocity =
2*average velocity
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Acceleration=
Change in velocity/time = (2*averagevelocity)/time
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Acceleration =
(2*(distance/time))/time
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Force=
Mass*Acceleration
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Weight=
Mass*g
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Newtons=
Kg*10
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What is another name for gravitational field strength?
Gravitational acceleration
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What is the values for g?
10N/Kg or 10m/s^2
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What is Newton’s third law?
If object A exerts a force on object B then object B will exert an equal and opposite force on object A
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What must the forces be?
The same type of force
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What are these forces usually?
Magnetic, gravitational, mechanical
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What 5 things does a Newtonian pair always do?
Act on two separate objects. Are the same type of force. Act along the same line. Are equal in size (magnitude). Opposite in direction.
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When is work done?
When a force is used to move an object
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What 2 things does the amount of work depend on?
The size of the force, the distance move
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Work Done=
Force*ditance moved
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What is work done measured in?
Joules
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What is weight?
Force due to gravity
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Power=
Energy transferred/time taken
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What does 1 watt equal
1 Joule/second
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What do you go work against when an object is lifted?
Gravity
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What does this work done equal?
Gravitational potential energy gained by the object
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gPE=
M*g*h
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What causes an object to have larger kinetic energy?
Larger mass and velocity
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KE=
0.5*mass*speed^2
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What is Ke proportional to?
Velocity squared
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What happens to KE when a moving object stops?
It must be converted to other forms of energy
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Mgh =
0.5*mass*(velocity)^2
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2gh=
V^2
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Square root (gh)=
V
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When a ball is dropped why will velocity actually be less than what is calculated?
Air resistance
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What does this mean for the bounce?
It will be lower
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How is energy also transferred?
Heat and sound
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What does momentum depend on?
The objects mass and velocity
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The larger the mass, the larger the velocity...
The larger the momentum the harder to stop
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Momentum=
Mass*velocity
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Acceleration=
Change in velocity/time taken
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Force=
Change in mass/change in acceleration
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Change in momentum=
Final momentum - initial momentum
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What happens to momentum is no external forces act
It remains constant
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Collisions
Total moment before collision = total moment after collison
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Separation of objects
Initial momentum = final momentum (opposite and equal if 2 objects)
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What are the 2 effects forces can have in an object?
Change it’s velocity and change of shape
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What do you need to compress stretch or bend some objects
It requires 2 forces
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What happens if the force gets too large
The object deforms plastically.
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How is this shown on a graph?
No longer a straight lone
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What happens to Hookes law
It no longer applies
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Force=
Extension * spring constant
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What is spring constant measured in?
N/m
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What does K equal on a force extension graph
Change in y/change in x
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Energy stored
0.5*K*(extension)^2
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How can you calculate the size of a moment?
Multiply the force by the perpendicular distance to the pivot
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Moment=
Distance*force
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What must a moment have?
Clockwise or anti-clockwise direction
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What happens if gear wheels are different sizes?
They will rotate at different speeds
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Which wheel will rotate slower?
The larger one
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Pressure=
Force /area
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What is pressure measured in?
N/m^2
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What does pressure act equally in?
All directions
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When does pressure increase?
With depth
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Why can gasses be compressed?
Because there is space between the particles
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Can liquids be compressed?
No
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Through what can pressure be conducted through?
Liquids
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Other cards in this set

Card 2

Front

How man Km in a mile?

Back

1.6

Card 3

Front

On a distance time graph what is the gradient of the line?

Back

Preview of the front of card 3

Card 4

Front

On a distance Time graph what does a steep line mean

Back

Preview of the front of card 4

Card 5

Front

On a distance time graph what does a straight line mean?

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