Definitions
Forces
Gravity
Air resistance
Misc.
100
Define force
A push or pull interaction between two objects
100
State the unit of measurement for force
Newton (N)
100
When will gravity be the strongest?
A. The further away you are from an object
B. The closer you are to an objecT
100
Which has more air resistance - a feather, or a stone?
A feather
100
The more mass an object has, the faster it will fall?
FALSE
200
Define gravity
A non-contact force that attracts objects to each other
200
List the 5 actions a force can make an object do
Accelerate
Decelerate
Stop
Change shape
Change direction
200
State one force that acts against gravity
Air resistance
200
Explain how air resistance is increased on an object
By changing it's shape and size
200
The following forces are balanced
TRUE
300
Define mass
The amount of matter or 'stuff' in an object
300
Which would be an example of an unbalanced force?
A. A plate sitting on a dining table
B. A ball at the top of a hill that is not moving
C. Earth orbiting the Sun
D. A baseball that has been thrown to home plate.
300
Is gravity a contact or non - contact force?
Non - contact
300
In what direction does air resistance act on an object that is falling straight down?
A. Down
B. Right
C. Left
D. UP
300
Objects of different shapes and sizes will fall at different rates on the moon
FALSE
400
Define weight
The force of gravity on an object
400
Why does a book on a table not move?
The force of gravity is pushing down, the normal force of the table is pushing up. The forces are balanced.
400
Is there more gravitational force between you and the Earth or an elephant and the Earth? and Why?
Elephant - more mass
400
Draw a diagram showing the direction that air resistance and gravity is acting on an open parachute. Consider whether the arrows will be balanced or unbalanced.
The gravity arrow should be bigger, and pointing downwards. The air resistance arrow should be smaller and pointing upwards.
400
What does it mean when we say that levers are 'force multipliers?'
They increase the amount of force that is acting on the load, which reduces effort.
500
Define air resistance
The force that air exerts on objects moving through it
500
What is the net force?
4000 N left
500
Explain why planets in our solar system do not 'escape into space'
The planet's are pulled towards the Sun by a gravitational force. The force is not strong enough to pull the planets into the sun. But, it is strong enough to keep them from escaping into deep space.
500
Explain why air resistance increase as speed increases
The faster something is falling, the more 'air' the object encounters, the more resistance there is on it.
500
A second class lever is a type of lever that has the load in the middle.
TRUE