Forces And Motion Flashcards
What is the equation for weight?
W=mxg
What is stopping distance made up of?
Thinking distance and braking distance
What are the two equations for acceleration?
V2-U2=2as
(Final velocity)2 - (initial velocity)2 = 2 x acceleration x distance
A=^V/t
Acceleration = change in velocity / time
On a velocity time graph what does the gradient mean?
Acceleration
What are the typical speeds for walking, running and cycling?
Walking = 1.5m/s
running = 3m/s
Cycling = 6m/s
What is the equation for work done?
W=Fs
Work done = force x distance
What is the conservation of momentum?
In a closed system the total momentum before the event and after the event is the same
What is the equation for momentum?
P=mv
Momentum = mass x velocity
What is a contact force and what are examples of it?
Objects that are physically touching
- friction
- air resistance
- tension
- normal contact force
What is a non contact force and what are examples of it?
Objects are physically separated
- gravitational
- electrostatic
- magnetic
What is the equation for spring constant?
K= f/e (f=ke)
When an object falls through a fluid, what is its initial acceleration due to?
Gravity
How do you measure weight?
Newton metre
How do brakes work?
- force is applied to brakes
- work done by friction between brake and wheel reduces kinetic energy of vehicle and increases thermal energy of the brake
What two things does the motion of a circle require?
- constant speed
- changing velocity / distance
Near the earths surface, any object falling under gravity has an acceleration of…
9.8 m/s2
