Physics Concepts and Formulas

Front

What is the SI unit of speed?

Back

Metres per second (m/s)

Front

A train covers 60 km in 20 minutes. Calculate its average speed in m/s.

Back

Distance = 60 km = 60,000 m. Time = 20 min = 1200 s. Speed = 60,000 ÷ 1200 = 50 m/s

Front

What does the gradient of a distance-time graph represent?

Back

Speed

Front

What does the gradient of a velocity-time graph represent?

Back

Acceleration

Front

What does the area under a velocity-time graph represent?

Back

Distance travelled

Front

State the equation for average speed.

Back

Average speed = Total distance ÷ Total time

Front

A car travels at 60 km/h for 15 minutes. How far does it travel?

Back

Distance = Speed × Time = 60 km/h × 0.25 h = 15 km

Front

Define acceleration.

Back

The rate of change of velocity per unit time

Front

A car increases its speed from 10 m/s to 25 m/s in 5 s. Find its acceleration.

Back

a = (25 – 10) ÷ 5 = 3 m/s²

Front

What is the unit of acceleration?

Back

m/s²