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| Question | Answer |
|---|---|
| State the word equation for constant speed. |
\( \text {speed} = \frac{\text {distance travelled}}{\text {time taken}} \) |
| Write the symbol equation for constant speed. |
\( \text {v} = \frac{\text {s}}{\text {t}} \) |
| State the units of - (a) speed (b) distance (c) time |
the units of - (a) speed are metres per second (m/s) (b) distance are metres (m) (c) time are seconds (s) |
| Sketch a distance-time graph for an object that is - (a) stationary (b) moving at a constant speed (c) accelerating |
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| What does the gradient of a distance-time graph represent? | it represents speed |
| What is a tacograph? | equipment fitted to a vehicle that records its speed and distance |
Describe the journey that produces the graph below - |
12:00 to 12:30 - vehicle travels 50m at a constant speed 12:30 to 13:00 - vehicle is stationary 13:00 to 14:30 - vehicle travels a further 50m at a constant speed 14:00 to 14:30 - vehicle is stationary 14:30 to 15:00 - vehicle travels back to where it started |
| A train takes 1 hour and 15 minutes to travel 180km. Find the speed of the train. |
First convert to standard units. time = 1 hour and 15 minutes = 75 minutes = 4500 seconds distance = 180km = 180 000 metres
\( \text {speed} = \frac{\text {distance travelled}}{\text {time taken}} \) |
| Question | Answer |
|---|---|
| What is a vector and a scalar? | a vector has both direction and magnitude but a scalar only has magnitude |
| What is the difference between speed and velocity? | speed is a scalar and velocity is a vector |
| What is velocity? | speed in a given direction |
| Describe a situation with bodies that have the same speed but different velocity. | two cars are both travelling at 30 m/s with one going south and one going north have different velocities because they are travelling in opposite directions |
| Describe a situation where a body has a constant speed but not a constant velocity | an object travelling in a circle with a constant speed will not have a constant velocity because its direction keeps changing |
| What is displacment? | a distance and a direction |
| Describe the motion of an object moving with a constant velocity. | it is moving with a constant speed without changing direction i.e. moving in a straight line |
| What is acceleration? | the change of velocity per second |
| What are the units of acceleration? | metres per second squared (m/s2) |
| State the word equation for average acceleration. |
\( \text {acceleration} = \frac{\text {change in velocity}}{\text {time taken for the change}} \) |
| Write the symbol equation for average acceleration. |
\( \text {a} = \frac{\text {Δv}}{\text {t}} \) |
| How does one find acceleration from a velocity-time graph? | the gradient |
State the symbol and units for • acceleration • initial velocity • final velocity • time taken |
The symbol and unit for • acceleration is a and m/s2 • initial velocity is u and m/s • final velocity is v and m/s • time taken is t and s |
| What is the formula for acceleration? |
\( \text {a} = \frac{\text {v - u}}{\text {t}} \) |
| What is the effect of deceleration? | it slows an object down |
| What is another name for deceleration? | negative acceleration |
| Question | Answer |
|---|---|
| Describe what acceleration measures? | how veolcity changes |
| What equipment can be used to monitor the motion of a moving trolley? | a motion sensor connected to a computer |
| What happens to the velocity of a trolley as it rolls down a runway? | the velocity increases i.e. it accelerates |
| What happens if the runway is made steeper? | the velocity increases faster i.e. acceleration is greater |
| What does a straight line graph of velocity against time say about acceleration? | it says acceleration is constant |
| Sketch 9 separate graphs • an s-t, v-t and a-t graph for a stationary body • an s-t, v-t and a-t graph for a body moving with a constant velocity • an s-t, v-t and a-t graph for a body moving with constant acceleration |
 |
| How do you find velocity from an s-t graph? | the gradient |
| How do you find the acceleration from a v-t graph? | the gradient |
| How do you find the distance travelled from a v-t graph? | the area under the graph |
| What is the effect of braking on a moving vehicle? | it slows the vehicle down |
| What is the acceleration of a vehicle moving at a constant velocity? | zero |
| What does a positive gradient on a v-t graph represent? | a positive acceleration i.e. the velocity is increasing |
| What does a negative gradient on a v-t graph represent? | a negative acceleration i.e. the velocity is decreasing, sometimes known as deceleration |
| Question | Answer |
|---|---|
| Describe the distance-time graph of an object moving at a constant speed. | a straight line sloping upwards |
| What is the gradient of a distance-time graph represent? | the speed of an object |
| How is the gradient of a graph found when it is not a straight line? | by drawing a tangent to the point where the speed is wanted, and finding the gradient of the tangent |
| Describe the speed-time graph of an object moving at a constant acceleration. | a straight line sloping upwards |
| What is the gradient of a speed-time graph represent? | the acceleration of an object |
| What is the word equation for average acceleration? |
\( \text {average acceleration} = \frac{\text {change of velocity}}{\text {time taken}} \) |
| How is the distance travelled found from a speed-time graph? | the area under the line of a speed-time graph is the distance |
| State the three equation for a body moving at a constant acceleration. |
• v = u + at • s = ut + 1/2 at2 • v2= u2 + 2as |
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