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Details

P4
Explaining Motion
29
Physics
10th Grade
01/10/2008

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Cards

Term
Speed =
Definition

Distance

Time

Term
Work Done =
Definition

Force x Distance moved

Term
Velocity =
Definition

Momentum

Mass

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.
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