Shared Flashcard Set

Details

P4
Explaining Motion
29
Physics
01/10/2008

Term
 Speed =
Definition
 DistanceTime
Term
 Work Done =
Definition
 Force x Distance moved
Term
 Velocity =
Definition
 MomentumMass
Term
 What is the 1st Law of Motion?
Definition
 If the resultant force acting on an object is zero then the momentum/speed of the object doesnt change
Term
 What is the 2nd law of Momentum?
Definition
 If there is a resultant force then the momentum/speed changes.
Term
 When there is no movement forces are _______ and _____
Definition
 Opposite and Equal
Term
 If an object is moving at a steady speed then forces are _______ and __________
Definition
 Equal and Opposite
Term
 When there is no movement forces are _______ and _____
Definition
 Equal and Opposite
Term
 Why would Jet Engines not work in space?
Definition
 because they work by drawing air in and pushing it out, the force pushes the plane forward. But there is no air in space.
Term
 How does a car move forward?
Definition
 The wheels exert a backwards force on the road, friction stops the wheel from spinning and exerts an equal and opposite force on the on the car which starts moving forward.
Term
 How is friction different from most other forces?
Definition
 It is responsive; it will change to match the force you resist it with, up to a limit.
Term
 What forces are acted upon a stationary ball on a table?
Definition
 Gravity is pulling the ball down. The table is pushing the ball up. The forces are equal and opposite
Term
 A bag is on a seat, the bag squashes the seat until the ______ on the bag is equal to the ________
Definition
 Until the upwards force on the bag is equal to the downwards force of gravity.
Term
 What does the gradient represent on a distance/time graph?
Definition
 Speed
Term
 What does the gradient represent on a speed/time graph?
Definition
 Acceleration
Term
 What are tachographs?
Definition
 A tachograph is a device that is fitted to a vehicle to measure how fast and for how long a driver drives. Lorry drivers have to have them to make sure they do not break the law.
Term
 What does the amount of momentum gained depend on?
Definition
 The size of the force and the length of time it is applied.
Term
 What is Work measured in?
Definition
 Joules
Term
 Energy Transfered is the same as
Definition
 Work Done
Term
 Gravitational Potential Energy =
Definition
 Height x Mass
Term
 Kinetic Energy =
Definition
 1/2 x mass x (velocity)2
Term
 Work Done is the same thing as
Definition
 Kinetic Energy
Term
 GPE stands for
Definition
 Gravitational Potential Energy
Term
 KE stands for
Definition
 Kinetic Energy
Term
 When things fall GPE loss =
Definition
 KE gain.
Term
 Speed is never
Definition
 Negative
Term
 What do you to do to mass to get weight on planet earth?
Definition
 Multiply it by 10
Term
 REMEMBER MASS IS NOT THE SAME AS WEIGHT
Definition
 YOU HAVE BEEN WARNED
Term
 How do you find the gradient of a straight line?
Definition
 Create a triangle and using the axis values divide y value by the x value.
Supporting users have an ad free experience!