P2 Topic 3 - Motion And Forces Flashcards
What is a vector measurement?
Give examples.
A quantity that can be measured with direction and magnitude.
Velocity, Acceleration and Force.
What is a scalar measurement?
Give examples.
A quantity that can be measured by magnitude but not direction.
Speed, Temperature, Pressure, Density, Voltage, Power, Wavelength and Frequency.
Define velocity.
Velocity is how fast something is moving in a certain direction.
Define speed.
Speed is how fast something is moving.
Equation Triangles:
- Force
- Distance
- Weight
- Change in velocity
Force=Mass x Acceleration
Distance=Speed x Time
Weight=Mass x Gravity
Change in Velocity=Acceleration x Time
Define mass.
The measurement of how much matter a body is made from.
Define displacement.
The distance and direction from a specific point.
How do you find the acceleration and distance travelled on a Velocity-Time graph?
The area under the graph is equal to the distance travelled and the slope is equal to the acceleration.
SUVAT equations:
- Time taken
- Initial velocity
- Final velocity
- Average velocity
- Displacement
- t = (v - u) / a
- u = v - at
- v = u + at
- Average = (u + v) / 2
- s = t(u + v) / 2
What does the line of a Distance-Time graph look like when the object is:
- Stationary
- At a steady speed
- Accelerating
- Decelerating
- Flat line
- Straight line
- Steepening of a curve
- Plateauing of a curve
What does the line of a Velocity-Time graph look like when the object is:
- Stationary
- At a steady speed
- Accelerating
- Decelerating
- Increasing acceleration
- Line is at zero
- Flat line
- Uphill lines (/)
- Downhill lines ()
- Exponential curve
What does a downhill line and gradient mean on a Distance-Time graph?
A downhill section means that the object is going back towards its starting point, and the gradient is equal to the speed of the object.
What is the equation for weight?
Weight = Mass x Gravitational Strength (10 on Earth)
What is terminal velocity?
Terminal velocity is the highest speed an object can fall at. An object reaches this speed once the force of air resistance becomes equal to the force of its weight.
What is a resultant force?
The resultant force of an object is the overall force acting on a body. If the resultant force is equal to zero, there will be no change in the velocity of the object (it will continue travelling at the same speed). If the resultant force is not equal to zero, the object will accelerate in the direction of the resultant force.
