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40 Cards in this Set
- Front
- Back
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Give 3 examples of non-contact forces: |
• Magnetic Forces • Gravitational Force • Electrostatic Force |
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What does elastically deformed mean? |
It can go back to its original shape and length after a Force has been removed |
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What does inelastically deformed mean? |
If it doesn’t return to its original shape and length after the force has been removed |
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Extension of Directly proportion Force equation: |
Force (N) = Spring constant (N/m) x Extension |
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What type of vector is Distance? |
Scalar Quantity |
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Describe displacement: |
• Vector quantity • Measures distance and direction in a straight line from an objects starting point to its finishing point |
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Work done in Spring constant equation: |
EPE (J) = 1/2 x Spring constant (N/m) x Extension² (m) |
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Define speed: |
Speed is how fast you are going with no regard to direction |
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Define velocity: |
The speed in a given direction |
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Speed equation: |
Distance travelled (m) = speed (m/s) x time (s) |
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What are the typical speeds for: • Walking • Running • Cycling |
• Walking = 1.5m/s • Running = 3m/s • Cycling = 6m/s |
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What is an Interacting pair? |
An interacting pair is a pair of forces that are equal and opposite and act on two interacting objects |
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What are the typical speeds for: • Car • Train • Plane |
• Car = 25m/s • Train = 30m/s • Plane = 250m/s |
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Define acceleration: |
Change in velocity in a certain amount of time |
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Formula for acceleration: |
Acceleration (m/s2) = Change in velocity (m/s) / Time (s) |
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What can constant acceleration be called? |
Uniform acceleration |
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Equation for constant acceleration: |
Final velocity (m/s) - Initial velocity (m/s) = 2 x Acceleration (m/s2) x Distance (m) |
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How does friction act? |
In the opposite direction to movement |
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Name one way to reduce friction: |
Lubricant |
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What is drag? |
The resistance you get in a fluid a gas or a solid |
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What does terminal velocity depend on? |
Shape and area |
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Describe Newton’s first Law: |
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 at the same velocity (speed and direction) |
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Definition of Mass: |
Measure of the amount of matter an object has |
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Name the 5 forms of acceleration: |
• Starting • Stopping • Speeding up • Slowing down • Changing direction |
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What is acceleration proportional to? |
Resultant force |
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Inertial mass measures what? |
How difficult it is to change the velocity of an object |
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Describe Newton’s third law: |
When two objects interact, the forces they exert on each other are equal and opposite |
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Stopping distance formula: |
Stopping distance = thinking distance + braking distance |
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What is thinking distance affected by? |
• Your speed • Your reaction time |
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What is braking distance affected by? |
• Your speed • Weather • Condition of tyres • How good your brakes are |
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What 2 things make an object have more momentum: |
• Greater Mass • Greater Velocity |
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Formula for momentum: |
Momentum (kg m/s) = mass (kg) x velocity (m/s) |
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What is called the conservation of momentum? |
I’m a closed system, the total momentum before an event (e.g collision) is the same after the event |
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What is the definition of weight? |
The force acting on an object due to gravity |
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What does the weight of an object depend on? |
Strength of Gravitational Potential Field at location |
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What is weight measured in? |
Newton’s |
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Weight equation: |
Weight (N) = Mass (kg) x GFS (N/kg) |
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What is the Gravitational field strength for Earth? |
9.8N/kg |
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Work done Equation: |
Work done (J) = Force (N) x Distance (m) |
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When you apply force to an object you may cause it to do what 3 things: |
• Stretch • Compress • Bend |
