1F Forces
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What is balanced forces?
when forces in opposite directions are equal.
What effect does balanced forces have on an object?
If the object is stationary, it will remain stationary. If the object is moving it, will remain moving at a constant speed.
What type of force happens when two objects touch each other?
Contact force.
Name the three effects that a force can have on an object.
Forces can change the speed, shape or direction.
What is a force?
A push or pull
What is a free body diagram?
Simplified diagram to show the forces acting on an object.
What is friction?
A force which acts in the opposite direction to which the object is moving.
What is Hooke’s law?
If you double the force on a spring, you double the extension of the spring.
What is a lubricant?
A substance added between two surfaces to reduce the friction.
Give examples of lubricants.
Oil, grease or polish.
What are forces measured in?
Newtons (N)
Which piece of equipment is used to measure forces?
A Newton Meter
Which type of force involves 2 objects that do not need to touch in order for a force to act?
Non-contact forces
Give 3 examples of non-contact forces
Gravity, magnetic, electrostatic
How do we calculate a ‘Resultant Force’ when 2 arrows are facing in the same direction on a free body diagram?
We add them together
How do we calculate a ‘Resultant Force’ when 2 arrows are facing in opposite directions on a free body diagram?
We take them away from each other.
How do we describe the force if 1 force acting on an object is larger than the other?
Unbalanced
What impact does an unbalanced force have, on an object?
It causes it to either speed up, slow down or change direction.
How do we calculate and average (mean)?
Add up all of the values then divide the total by the number of values.
State 4 rules for drawing a bar chart
1.Use a ruler 2.Bars and gaps are equal width 3.Scale (times table) 4.Independent variable on x axis 5.Label both axis and add units 6.Accurate plotting 7.Add a title
What is the Dependent Variable?
The measured results
What is the Independent Variable
The 1 variable being tested (changed in the investigation)
What does repeating an investigation do?
Makes the results more reliable. (Allows us to calculate an average).