1. How can we tell from a distance-time graph if an object is stationary?:
The line is horizontal
2. How can we tell if an object is moving at a constant speed?: The line
is straight that slopes upwards.
3. What does the gradient of a distance-time graph tell us?: This represents
the object's speed.
4. How do we calculate the speed of an object?: Speed in m/sec =
distance travelled (m) /
time taken (s)
5. What is the difference between speed and velocity?: Velocity is speed
in a given direction.
6. What is acceleration and what is its unit of measurement?: Acceleration
is change of velocity per second. m/s squared.
7. How do we calculate the acceleration of an object?: Acceleration =
change of velocity / time taken
8. What is deceleration?: Or negative acceleration. When an object slows
down.
,9. What can we say if a velocity-time graph is a horizontal line?: The
accelera- tion is zero
10.How can we tell from a velocity-time graph if an object is accelerating
or decelerating?: From the gradient of the line.
11.What does the area under a velocity-time graph represent?: Distance
trav- elled.
12.What can forces do?: A force can change a shape of an object or
change its motion or its state of rest.
13.What is the unit of force?: Newtons (N)
14.When two objects interact, what can we say about the forces acting?:
When 2 objects interact they always exert equal and opposite forces on
each other.
15.Where does friction act in a car?: Between the ground and the tyre of
each drive wheel.
16.What is a resultant force?: The resultant force is a single force that
has the same effect as all the forces acting on an object.
17.What happens if the resultant force on an object is zero, or, not zero?: If
the resultant force is zero the object stays at rest or at constant
velocity. If not zero then the velocity of an object will change.
, 18.How do we calculate the resultant force when an object is acted on by
two forces acting along the same line?: The resultant force is either - their
sum if the forces act in the same direction, or, their difference if the the
forces act in opposite directions.
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