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29 questions
What is the name of the units that we measure force in?
Einsteins
Newtons
Kilograms
Metres
When will the forces of gravity between two objects be the GREATEST?
when the masses of both objects are small and the objects are far apart
when the masses of both objects are large and the objects are close together
when the masses of both objects are small and the objects are close together
when the masses of both objects are large and the objects are far apart
Which statement about gravity is true?
gravity causes objects to pull towards one another
gravity causes objects to push away from each other
gravity only takes place between planets
the moon doesn't have any gravity
Which two of these forces act on parachutes?
Air Resistance
Gravity
Thrust
Kinetic Energy
What causes an object to fall faster?
Smaller surface area
Larger surface area
If it has a parachute
If it is softer
Another name for air resistance is...
Buoyancy
Streamline
Gravity
Drag
The larger the surface area of the moving object, the ___________ air resistance there is.
Less
More
Longer
Quicker
Air resistance pushes against falling
objects and __________________.
Speeds them up
Keeps them afloat
Slows them down
Spins them
The larger the parachute the ____________
Less air resistance
More surface tension
Less drag
More drag
Which has more air resistance?
Air resistance is a force caused by...
Water pushing against moving objects
Air pushing against moving objects
Gravity pushing against moving objects
Normal force pushing against moving objects
The more streamlined an object is, the...
More air resistance
Less air resistance
Slower air resistance
Faster air resistance
When dropped from the same distance, which will fall to the floor faster?
Look at the pictures of the cars. Which car will have the most air resistance force acting upon it? They will be moving at the same speed.
All will have equal air resistance force.
What is a parachute designed to maximize?
Gravity
Air Pressure
Air Resistance
Thrust
What causes objects to fall slowly through the air
Weight
Surface area
The color
Mass
Complete the sentence.
It is not the difference in gravity that causes objects to fall at different speeds, it’s the difference in the amount of__________________.
Gravity
Mass
Air resistance
a) When should a sky diver open his/her parachute?
b) Why?
a) anytime
b) a parachute has a large surface area so increases air resistance
a) Anytime
b) Since this will be when the air resistance is at a maximum. This will give the greatest increase in drag needed to slow down the diver.
a) When the resultant force is zero (air resistance = weight)
b) a parachute has a large surface area so increases air resistance
a) When the resultant force is zero (air resistance = weight)
b) Since this will be when the air resistance is at a maximum. This will give the greatest increase in drag needed to slow down the diver.
An object travelling at terminal velocity moves at a steady speed.
True
False
Which diagram shows the forces acting on Peter when he is falling at Terminal Velocity?
1
2
3
Acceleration due to gravity on Earth is...
10 m/s/s
9.81 m/s/s
9.8 m/s/s/s
98 m/s/s
A skydiver jumps from a plane. The instant she jumps, her resultant force is
upwards
to the right
downwards
to the left
A skydiver jumps from a plane. As she falls, air resistance upwards is
decreasing
increasing
constant
zero
A skydiver jumps from a plane. The air resistance has increased so it is equal in size to her weight. She is
accelerating
travelling at terminal velocity
stationary
decelerating
The skydiver opens her parachute. The air resistance upwards
increases
decreases
is zero
remains constant
The skydiver opens her parachute. The air resistance is _______ than her weight
larger than
smaller than
the same as
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