Motion Flashcards
(22 cards)
How do you find the speed from a distance-time graph if the object is accelerating?
Draw a tangent to the curve and find the gradient.
What is the difference between speed and velocity?
Speed is a scalar quantity and only has a magnitude (size), velocity is a vector quantity and has both magnitude and direction.
What factors can affect the speed at which someone walks, runs, or cycles?
Age, fitness, terrain, and distance travelled.
What are typical speeds for a person walking, running, and cycling?
1.5 m/s, 3.0 m/s, and 6.0 m/s respectively.
What are typical speeds of a car and a train?
13-30 m/s and 50 m/s respectively.
What is a typical speed for sound travelling in air?
330 m/s.
What is acceleration?
A change in velocity of an object per second.
What is the unit of acceleration?
Meters per second squared (m/s²).
How can an object be accelerating even if it is travelling at a steady speed?
If it is changing direction.
What is happening to an object if it has a negative acceleration?
It’s slowing down.
What information does the gradient of the line in a distance-time graph provide?
The speed of the object.
What information does the gradient of the line in a velocity-time graph provide?
The acceleration of the object.
How can the distance travelled by an object be found from its velocity-time graph?
Calculate the area under the graph.
Velocity of an object defenition
It’s speed in a given direction
What will happen to an object when it is lifted?
It will gain gravitational potential energy
Equilibrium defenition
An object in equilibrium has no resultant force or moment acting on it this means that it will be stationary or travelling at a constant speed
Scalar defenition
Has magnitude eg distance
Why is velocity a vector
It has a magnitude and a direction
Distance-time graph :
A-upwards curve
B-downwards curve
C-steep gradient straight line
D-horizontal line
A-acceleration
B-deceleration
C-high constant acceleration
D-stopped
How can displacement be calculated?
By using the area of the object
Velocity-time graphs:
A-straight line
B-horizontal line
C-curved line
A-constabt acceleration
B-constant velocity
C-changing acceleration
Tangent definition
A straight line which touches the curve at a point and is drawn in the direction of the slope at that point
