forces and motion-science
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What is the correct way to calculate speed
distance/time
what are the units for speed
meters per second (M/S)
A horizontal line on a distance time graph means the object has…
stopped moving
A steep straight line on a distance/time graph means what
The object is travelling fast
What does the curve on a distance time graph mean
acceleration
A word to describe when an object is slowing down
Deceleration
How many stops where there in a journey with two horizontal lines
2
Calculate the resultant force of an object being pulled to the right by a force of 30N and 60N
90N to the right
calculate the resultant force of an object being pulled 10N to the left and 30N to the right
20N to the right
complete the sentence, if the resultant force is zero the object will…
remain at a constant velocity
what does the term resultant force mean
The overall force
If the resultant force is not zero the object will _____ in the ______ of the resultant force
accelerate, direction
Both friction and drag cause objects to…
slow down
What happens to the air resistance as the object increases speed
Air resistance increases
what is a moment
The turning effect of a force
What is the correct equation to calculate a moment
moment=force x distance
What is the unit of a moment
newton-metres (Nm)
A lever turns about a point. What do we call this point
Pivot
what happens to the effort required to lift a heavy object as more pulleys are added
effort decreases