Measuring instantaneous speed analysis (v=s/t) | Combined science

Starter quiz

Match the units to the quantity they measure.
- distance
  
  ⇔
  
  metres ✓
- time
  
  ⇔
  
  seconds ✓
- mass
  
  ⇔
  
  kilograms ✓
- speed
  
  ⇔
  
  metres per second ✓
How is average speed calculated?
- $\text{average speed} = \text{distance} \times \text{time}$
- $\text{average speed} = \text{distance} + \text{time}$
- $\text {average speed} = {\text{distance} \over \text{time}}$ ✓
- $\text{average speed} = \text{distance} – \text{time}$
- $\text{average speed} = \text{distance} \times \text{time}^2$
Match the symbol to the quantity.
- $s$
  
  ⇔
  
  distance (displacement) ✓
- $v$
  
  ⇔
  
  speed (velocity) ✓
- $t$
  
  ⇔
  
  time ✓
Why is the instantaneous speed of a trolley greater at the bottom of the ramp than near the top?
- A resultant force is acting on the trolley, causing it to speed up. ✓
- Frictional forces are increasing the speed of the trolley.
- The trolley is producing more energy as it moves faster.
- The mass of the trolley is decreasing as it travels.
During an experiment, a trolley rolls down a ramp, getting faster as it moves. Which two statements are correct?
- The instantaneous speed is constant.
- The instantaneous speed is greatest at the bottom of the ramp. ✓
- The instantaneous speed is greatest at the top of the ramp.
- The greatest instantaneous speed is higher than the average speed. ✓
- The greatest instantaneous speed is lower than the average speed.
Calculate the speed of a trolley if it travels a distance of 10 cm in 0.2 s. Give your answer in m/s.
- '0.5 m/s' ✓