Definitions
Types of Forces
Net Force
Effects of forces
Mystery
100
Define the word "force"
Push, Pull or Twist
100
Name the force that is a direct push, pull or twist. E.g. Pushing a box
Applied force
100
Find the net force, if 100 N acts left on a box, and 200 N acts right on a box.
100 N (right)
100
The effect of the force when, "you squish a soft drink can."
Change of shape
100
The units of force is named after which famous scientist?
Newton
(Optional: "Sir Isaac Newton")
200
Define "contact force"
Force that involves 2 objects touching each other
200
Name the force that acts on all objects from the centre of mass (on Earth)
Gravity
200
Find net force
0 N
200
A tennis ball is returned with a tennis racquet.
Change in direction
200
Name one measuring device to measure force.
Either "spring balance" or "weighing scales"
300
Define "non-contact force"
Force acts over a distance without touching.
300
Name the force present in lightning or rubbing a balloon on your head.
Electrostatic
300
Find the net force
5 N up
300
A bicycle has 200 N of applied force forward, and 200 N of friction backwards.
Constant speed.
300
What was hypothesised to have fallen on Sir Isaac Newton's head to lead him to "discover" gravity?
An apple.
400
Define "balanced force"
When the forces acting on an object are equal in size, and act in opposite directions.
400
Name the force that is the reason that a boat floats.
Buoyancy
400
Find the net force
17 N to the right
400
List the three possible effects that an unbalanced force can have.
Change in speed (accelerate/decelerate)
Change direction
Change shape
400
Name TWO non-contact forces
Any 2 of the following: gravity, magnetism, electrostatic
500
Define "friction"
The force opposing motion between 2 surfaces in contact.
500
Name the force that is the reason water droplets are round.
Surface tension
500
Find the net force
20 N down
500
List the three possible effects that "balanced forces" have
No visible effect
Keep object stationary
Keep object moving at a constant speed/direction
500
Name three contact forces.
Friction, applied, normal