PHYSICS Flashcards
What is speed?
Distance travelled in a certain time
What is speed?
How quick things speed up.
What is power usually measured in?
watts, W
kilowatts, kW
1kW = 1000 W
What is energy measured in?
Joules
What is the formula for electrical power?
Power (W) = Voltage (V) x Current (A)
what is elastic potential energy converted into once force is removed?
Kinetic energy
What is extension directly proportional to?
The force applied
What is the limit of proportionality?
The maximum force that will extend proportionally
What is work done stored as?
Elastic potential energy
What is an elastic object?
it can go back to its original shape after the force is removed.
what is the equation for elasticity?
force exerted by a spring (N) = Extension (M) x spring constant (N/M)
An object travelled 800 m in 40 seconds.
Use the equation: distance travelled (m) = speed (m/s) × time (s)
What is the speed of the object?
B
Which is a scalar?
A Acceleration
B Displacement
C Force
D Speed
D
- A lorry has a mass of 3500 kg. It travels at a speed of 30 m/s.
Use the equation: Kinetic Energy = 0.5 × Mass × Speed2
Calculate the kinetic energy of this lorry
C
A car travels at 72 km / h.
How fast is this in metres per second (m / s)
B
