Dynamics & Space
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- Created by: Brooke_29
- Created on: 04-09-17 18:48
What is a vector?
A vector is a quantity which has magnitude (size) and direction.
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Name examples of a vector.
Weight, Force, Velocity, Acceleration, Displacement
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What is a scaler?
A scaler is a quantity which has only magnitude (size).
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Name examples of a scaler.
Mass, Time, Speed, Energy, Distance
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A car is travelling at 35mph, is it a scaler or vector?
Scaler
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A diamond has a mass of 25g, is it a scaler or vector?
Scaler
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On the moon an astronaut weighs 20kg, is it a scaler or vector?
Vector
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How must vectors be drawn?
Tip to Tail
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How is the displacement of a vector calculated?
Pythagoras Theorem
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How is the angle of the displacement calculated?
tan-1(y)
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What must all scale drawings have?
A scale
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If there is a curved line going up the way ona distance-time graph what does it show?
Acceleration
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What does the area under a speed-time graph graph show?
The distance travelled
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If there is a straight diagonal line going up on a velocity-time graph what does it show?
Constant acceleration
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If the line on a velocity-time graph is horizontal what is the motion?
Constant speed
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If there is a straight diagonal line going up on a distance-time graph what does it show?
Constant speed (the gradient of the line gives the speed)
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What does the area under a velocity-time graph show?
The displacement
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What is average speed?
The speed given for the total distance divided by total time taken
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What is the acceleration of an object?
A measure of how quickly its velocity changes
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What word should be used instead of saying deceleration?
Negative acceleration
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What is Newton's 1st law?
A body in motion stays in motion at constant velocity and a body at rest stays at rest unless acted upon by a net external force.
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What is inertia?
Inertia is the quality in matter (matter is anything you can touch) that lets it stay still if it is still, or keeps it moving if it is moving.
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What is Newton's 2nd law?
f=ma
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What is Newton's 3rd law?
Every action has an equal and opposite reaction
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How does a rocket launch?
The exhaust from the rocket pushes back on the air creating an unbalanced (resultant) force forwards.
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Which law does the launch of a rocket agree with?
It agrees with Newton's third law which states that every action (the exhaust pushing on the air) has an equal and opposite reaction (the rocket being propelled forward)
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What is terminal velocity?
The terminal velocity is the fastest velocity that an object can have as it is falling. It is a balanced force
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What does g stand for?
Gravity
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How does gravity act?
Gravity acts towards the centre of an object. It is an invisible force that tries to bring objects together. It depends on 2 things mass and distance
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How does size affect gravity?
The bigger something is the bigger the force of attraction
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Name all 9 types of energy.
Kinetic energy, Chemical energy, Light energy, Nuclear energy, Electrical energy, Gravitational potential energy (GPE), Elastic potential energy, Thermal energy & Sound energy
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If anything moves what does it have?
Kinetic energy
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If anything is lifted above the Earth what does it have?
Gravitational potential energy (GPE)
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What is work done?
Energy transformed (changed) when a force moves an object (in the direction of the force)
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When you roll a ball down a hill what is the energy transfer?
GPE to Kinetic energy
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When you walk up a flight of stairs what is the energy transfer?
Kinetic energy to GPE
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Other cards in this set
Card 2
Front
Name examples of a vector.
Back
Weight, Force, Velocity, Acceleration, Displacement
Card 3
Front
What is a scaler?
Back
Card 4
Front
Name examples of a scaler.
Back
Card 5
Front
A car is travelling at 35mph, is it a scaler or vector?
Back
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