Starter quiz
- What is the international standard unit used to measure speed and velocity in physics? Give the symbol.
- 'm/s' ✓
- Which of the following is a vector quantity?
- speed
- distance
- mass
- velocity ✓
- volume
-
- A lorry is travelling along a straight road. Its speed increases from 5.6 m/s to 8.4 m/s. Which of the following is the change in velocity for the lorry?
- 1.4 m/s
- 2.8 m/s ✓
- 5.6 m/s
- 8.4 m/s
- 14 m/s
-
- A roller–skater covers a distance of 520 m in 40 s. Which of the following is the speed of the roller–skater?
- 0.8 m/s
- 13 m/s ✓
- 26 m/s
- 480 m/s
- 20 000 m/s
-
- How far will a wind-up toy travel if it moving at a speed of 0.02 m/s for 1 minute? Include a correct unit with your answer.
- '1.2 m' ✓
- A rocket covers a distance of 500 m whilst travelling at 5.0 km/s. Which of the following is the time taken for the rocket to cover this distance?
- 0.1 s ✓
- 0.25 s
- 1.0 s
- 10 s
- 25 s
-
Exit quiz
- Match the following key words or phrases to their definitions.
- velocity⇔the speed of an object in a particular direction ✓
- rate⇔the amount of change every second ✓
- acceleration⇔the rate of change of velocity ✓
- deceleration⇔the decrease in velocity every second ✓
- delta v (𝚫)⇔the symbol used to represent change in velocity ✓
- Match the following quantities to their definitions.
- velocity⇔a vector measured in m/s ✓
- distance⇔a scalar measured in m ✓
- acceleration⇔a vector measured in m/s ✓
- speed⇔a scalar measured in m/s ✓
- displacement⇔a vector measured in m ✓
- Which of the following are correct equations for acceleration ()?
- acceleration = change in velocity + time
- acceleration = change in velocity ÷ time ✓
- acceleration = change in velocity × time
- ✓
-
-
- A car takes 17.6 s to accelerate from 0 m/s to 44 m/s. Calculate the acceleration of the car in m/s. You do not need to include the unit in your answer.
- '2.5' ✓
- A motorcycle reduces its velocity from 25 m/s to 14 m/s in 5.5 s. Which of the following is the deceleration of the motorcycle?
- –2.0 m/s ✓
- –7.1 m/s
- –11.0 m/s
- –44.5 m/s
- –49.5 m/s
-
- A cricket ball moving at 20 m/s is hit by a bat, and then travels in the opposite direction at 15 m/s. The impact lasts for 0.05 s. Calculate the acceleration. You do not need to enter the unit.
- '–700' ✓
Worksheet
Loading worksheet ...
Presentation
Loading presentation ...
Video
Lesson Details
Key learning points
- A dynamics trolley has a constant acceleration down a steep ramp.
- Acceleration = change of velocity ÷ time and change in velocity = final velocity – initial velocity
- Light gates can improve accuracy of measurement of instantaneous velocity and reduces random errors.
- Using video recording allows for accurate measurement of small time intervals.
Common misconception
Pupils often think that final velocity is proportional to acceleration and do not take into account the time over which an object is accelerating.
Compare how many times greater the calculated accelerations of two sets of readings are compared to how many times greater the final velocities are.
Keywords
Acceleration - The acceleration of an object is the change in velocity per second.
Velocity - The velocity of an object is the change in displacement per second.
Dynamics trolley - A dynamics trolley is a wheeled object used in experiments. It moves very smoothly over flat surfaces.
+