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CP1H
GCSE Combined Science Physics
| Question | Answer |
|---|---|
| Define a vector Quantity | A quantity with both magnitude and direction |
| State 4 examples of Vector Quantities | Acceleration, Force, Displacement and Velocity or any correct 4 quantities |
| Define scalar Quantities | A quantity with magnitude but no direction |
| State 4 examples of quantities | Mass, time, distance and Speed or any correct 4 quantities |
| State a pair of vector quantity and scalar quantity that has the same unit. Also state the unit | Distance and Displacement both with units metre (m) |
| State another pair of vector quantity and Scalar quantity that has the same unit. state the units | Velocity and speed both with units metres / second (m/s) |
| Similarity between Vector quantities and Scalar Quantities | Both Vector quantities and scalar quantities have magnitude |
| Difference between vector quantities and Scalar quantities | Vector quantities have direction while scalar quantities does not have direction. |
| State the equation for speed. | Speed = distance /time |
| A body of mass 4 kg travels a distance of 48m in 6 seconds. What is the speed of the body? | Speed = 48m/6s = 8m/s |
| State the typical value for walking speed | 0.5m/s to 1.5m/s |
| State the typical value for the speed of sound in air. | 330m/s |
| State the typical value for the speed of light in a vacuum. | 300,000,000m/s |
| State the equation for average speed | Average speed =Total distance / total time |
| What is instantaneous speed | The speed at a particular point in a journey. |
| How do you calculate the speed from a distance/ time graph? | Calculate the gradient |
| What is the formula for finding gradient of a Distance – Time graph? | Gradient = Vertical distance between two points on a graph / Horizontal distance between the same two points on the graph |
| Describe the motion of the 3 Distance/time graphs as shown in order from left to right. | Graph on the Left is steeper so it has the fastest speed.Middle graph is not as steep as left graph so it is slower than left graph.Graph on the Right is horizontal, distance remains the same even though time is going, body stopped moving. |
| 1 Define Acceleration | Acceleration is the rate of change of velocity |
| 2.State the 2 equations for acceeration. | 1.a = (v- u)/t and 2. v2 – u2 = 2as |
| 3 What is the value of acceleration due to gravity? | 9.81m/s2 rounded to 10m/s2 |
| 4 What is a deceleration? | A deceleration is a negative acceleration |
| 5 A car speeds up from rest to 45m/s in 5seconds, find the accelerations | a = (v- u)/t a = (45m/s – 0m/s)/ 5s a = 45m/s / 5s a = 9m/s2 |
| 6 A car goes from 12 m/s to 98m/s while covering a distance of 0.4km. Calculate its acceleration. | v2 – u2 = 2as a = v2 – u2/ 2s , a = 98m/s – 12m/s /2x 400 a = 0.1075m/s2 |
| 7 A body accelerates at a constant rate of 5 m/s2 for 0.5 minute. What is the change in velocity? | a=(v- u)/t (v- u) =at (v –u) = 5m/s2 x 30s, (v-u) =150m/s |
| 8 If the body in number 7 had a final velocity of 200m/s. What was the initial velocity? | v –u = 150m/s 200m/s –u = 150m/s, u = 200m/s – 150m/s u = 50m/s |
| 1.What does the gradient of a Velocity – Time graph gives? | The gradient of a velocity – Time graph gives acceleration |
| 2. How can we compare the acceleration of lines on a velocity –Time graph? | The steeper line has the larger acceleration |
| 3.What does each section of the Velocity – Time graph represents. | Body travelling at constant velocity, Body decelerating to rest, Body stopped,Body acceleration in reverse, Body travelling at constant velocity in reverse |
| 4. In the velocity – Time graph, what motion is represented by the line? | The upward sloping line of a velocity- Time graph represent acceleration |
| 5. What is the formula for the area of a triangle? | 0.5 x base x perpendicular height |
| 6. What is the formula for the area of a rectangle? | Base x height |
| 7. What is the formula for the area a parallelogram? | 0.5 ( sum of parallel sides) x perpendicular height between them |
| 8 how do we find the total distance travelled by a body from a Velocity –Time graph | Find the area between the graph and the time axis. |
| 9. Find the total distance travelled by the body whose velocity – Time graph is shown below? | 0s to 5s shape rectangle ,5s x 10 m/s = 50m 5s to 10 s rectangle 5s x 10 m/s = 50m 5s to 10 s triangle 0.5 x 5s x 30m/s = 75m Total distance travelled = 50m + 50m +75m = 175m |
| The speed of an object in a particular derection is its ___________ | velocity |
| The change of an objects speed in a given time is the _________ | acceleration |
| Acceleration of falling objects close to the earth is ________ | 9.8 m/s2 |
| When the force moving an object is balanced by frictional forces it is moving at its _____________ _____________ | terminal velocity |
| On a distance time graph a straight line represents… | constant speed |
| On a distance time graph a upward curve represents… | acceleration |
| On a distance time graph a curved line becoming horizontal represents… | decelleration |
| On a distance time graph a horizontal line represents… | stationary |
| On a distance time graph the gradient is used to calculate the … | speed or velocity |
| On a velocity time graph an upwards straight line represents … | acceleration |
| On a velocity time graph a downwards straight line represents … | decelleration |
| On a velocity time graph a horizontal line represents … | constant speed |
| On a velocity time graph a horizontal line along the x-axis represents… | stationary object |
| On a velocity time graph, when the line falls below the x-axis it indicates that the object is … | moving backwards |
| Calcuating the gradient of a velocity time graph gives the … | acceleration |
| Calculating the area under a velocity time graph gives the … | distance travelled |
| A typical walking speed is … | 1.5 m/s |
| A typical running speed is … | 3 m/s |
| A typical cycling speed is … | 6 m/s |
| A value with magnitude and direction is a ____________? | vector |
| Distance an speed are examples of _________ quantities | scalar |
| Force, displacement and velocity are examples of __________ quantities | vector |
| A value with magnitude only is a ________? | scalar |
| State the equation which links distance, speed and time | s=vt |
| State the equation which links acceleration, change in velocity and time taken | a=Δv/t |
| A value with magnitude only is a ________? | scalar |
| State the equation which links distance, speed and time | s=vt |
| State the equation which links acceleration, change in velocity and time taken | a=Δv/t |
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Davenant Foundation School
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