Year 10 Physics Flashcards
What is the equation for impulse?
Impulse = force x time
What is the equation used to calculate the amount of force from an impact?
F = (mv – mu)/t Force = Change in velocity / time
What is the equation for momentum?
P = m x v
What is Kinetic Energy?
The energy that moving objects have. It depends on the objects mass and it velocity.
What is Work Done?
Work is done when energy is transferred from one form to another and is measured in Joules.
What is Gravitational Potential Energy (GPE)?
Gravitational potential energy is energy an object possesses because of its position in a gravitational field. The most common use of gravitational potential energy is for an object near the surface of the Earth where the gravitational acceleration can be assumed to be constant at about 9.8 m/s2.
What is the equation used to find velocity?
V = d / t Velocity = distance / time
What is velocity?
The speed of something in a given direction.
What is a vector?
A quantity having direction as well as magnitude.
What is displacement?
The distance from start to finish in a straight line.
What does SUVAT stand for?
s = Displacement (metres)
u = Initial Velocity (m/s)
v = Final Velocity (m/s)
a = Acceleration (m/s^2)
t = time (seconds)
What is Newtons First Law?
Every object will continue to move with a uniform velocity unless it is acted upon by a resultant external force.
What is Newtons Second Law?
The rate of change of an objects velocity is directly proportional to the resultant external force. The change in velocity takes place in the direction of force.
What is the equation for force?
F = m x a Force = mass x acceleration
What is Newtons Third Law?
For every action, there is an equal (in size) and opposite (in direction) reaction.
What is meant by the term ‘weight force’?
The amount of force in Newtons of a mass multiplied by gravity.
What happens to a moving object if it is acted on by a net force in the same direction as its motion?
The moving object accelerates.
What happens to a moving object if it is acted on by a net force in the opposite direction of its motion?
The moving object decelerates.
How does the acceleration of a bus full of passengers compare with an empty bus for the same net force?
The bus full of passengers will have a lower acceleration.
Why does a bike slow down on a level road when the rider stops pedalling?
Air resistance and friction of the wheels turning on their axel.
A net force causes a mass of 10kg to accelerate at 2 m/s^2. What is the magnitude of the net force?
F net = 20 N
What is special relativity?
The dependence of various physical phenomena on relative motion of the observer and the observed objects, especially regarding the nature and behaviour of light, space, time, and gravity.
What is momentum?
Momentum is the measure of how strongly an object is moving.
What is conservation of momentum?
The momentum of a system is constant if there are no external forces acting on the system.
What happens in a Perfectly Inelastic Collision?
All momentum is conserved
Kinetic energy is not conserved
The relative speed of separation is zero
What happens in an Inelastic Collisions?
All momentum is conserved
Kinetic energy is not conserved
You can’t say anything about the speed at which they leave each other without doing a calculation.
What happens in an explosion?
If a stationary object explodes, its initial momentum is zero.
Through the conservation of momentum, the momentum after the explosion must be zero.
This means that the momentum of all the parts of shrapnel add up to zero.
What is the equation for work done?
Work done = Force x distance moved
What is power?
Power is the rate of doing work and is measured in Watts.
What is the equation for power?
Power = Work done / Time
What is the Equation for Kinetic Energy
KE = 1/2 x m x v^2
