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CP1F

GCSE Combined Science Physics

QuestionAnswer
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 acceleration. 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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