Speed & Motion
A runner travels 100 m in 20 s. This is the distance divided by the time.
What is speed?
This force acts against movement when two surfaces rub together.
What is friction?
This wave feature is linked to how high or low a sound seems.
What is frequency?
A solid changes into a liquid during this change of state.
What is melting?
On a distance-time graph, what shows how fast an object moves?
What is a slope?
If forces on an object are balanced, this is the size of its acceleration.
What is zero?
A louder sound wave usually has a larger value of this feature.
What is amplitude?
A liquid changes into a gas at its boiling point during this process.
What is boiling?
A car travels 150 m in 10 s. Its speed is 15 m/s. This is the equation used.
What is speed = distance ÷ time?
When an object speeds up, slows down, and changes direction.
What is acceleration?
Sound cannot travel through empty space because it needs this.
What is a medium?
A gas changes into a liquid during this change of state.
What is condensation?
This term tells how fast an object moves.
What is speed?
A 2 kg object has a resultant force of 6 N. Using F=m x a its acceleration is.
What is 3 m/s²?
A reflected sound heard again after the first sound is called this.
What is an echo?
A liquid changes slowly into a gas from its surface, even below its boiling point.
What is evaporation?
On a speed-time graph, the area under the graph tells you this.
What is distance travelled?
What type of force makes an object change its speed or direction?
What is an unbalanced force?
This sound has a frequency above the range most humans can hear.
What is ultrasound?
When a liquid freezes, its particles become close together and stay in this type of arrangement.
What is a fixed position?