The area under a speed/time graph
Velocity
distance/time
Acceleration
Change in velocity divided by the change in time
Acceleration units
ms-2
Velocity units
ms-1
Velocity
The gradient of a distance/time graph is used to calculate:
Rise / run
The formula for calculating gradient on a graph
Deceleration
Another word for negative acceleration
Acceleration
The gradient on a speed / time graph
Force units
Newtons (N)
Force equation
F = ma
Balanced Force
No net force. Fnet = 0
Constant speed on a distance/time graph
Constant speed on a speed/time graph
Balanced force
An object moving at a constant speed or is stationary
Unbalanced forces
An object is accelerating or decelerating
Kilograms (kg)
Mass units
Weight
The downward acting force (The force of gravity acting on an object) F = mg
Weight units
Newtons (N)
Friction
The force between two objects that opposes motion
Upthrust
An upward force that acts against an object pushing down on something
Thrust
The force which makes an object move forward
Gravity on earth
10 N/kg
Joules (J)
Work units
Work
Force exerted on an object that causes it to move
Work done = Force x distance moved (w = Fd)
Formula for work
Kinetic energy
The energy of motion
Kinetic energy equation
Potential energy
The energy an object gains when it is lifted
Potential energy formula
Gravitational potential energy
The kinetic energy a falling object has just before it hits the ground, is the same as its _________________ before it was dropped.
Watt (W)
The unit of Power
Power formula
Decreases
If the force remains the same but the area increases, pressure ____________
Increases
If the force remains the same but the area decreases, pressure ____________
Greater
Snow shoes & skis 'work' because the force is spread over a _____________ area.
Wider
Drawing pins work because the force is spread over a ___________ area
Pressure definition
The amount of force exerted per unit area.
Pascal (Pa)
The units for pressure
Stopped
Between 15 & 35 seconds the obect has:
Acceleration
On a distance / time graph this curve means:
Deceleration
On a distance / time graph this curve means:
Terminal
At __________ velocity the weight force down equals the air resistance (drag) up
Heat
Work done against frictional forces is transferred mainly as:
Power
The rate of doing work or how quickly energy is transferred
Mass & speed
An object has more kinetic energy the greater it's :
Calculate Ep using Ep = mghJust before impact all its Ep is now converted to Ek - so calculate v using the equation for Ek
A 0.1 kg ball is dropped from a height of 1.5 m. Assuming all the Ep is converted into Ek, how fast is it travelling before it hits the ground?
Blue-spotted Goatfish