The combination of all of the forces acting on an object
What is Net Force
100
This is the friction between moving objects
What is kinetic friction
100
This object has such a huge mass we are very aware of the gravitational force it creates.
What is the Earth
100
This is the formula for speed
What is distance/time
100
This is the unit that force is measured in
What is Newton
200
To determine the net force when the forces being applied are in the opposite directions you do this to the forces
What is subtract the forces
200
What do we add to our car motors or to bicycle chains to reduce friction?
What is add oil?
200
A. This is what happens to gravity as mass increases.
B. This is what happens to gravity as distance between the objects increases
What is
A. Increases
B. Decreases
200
For every action there is an equal but opposite reaction.
What is Newton's 3rd Law of Motion
200
This is the speed of an object in a particular direction
What is velocity
300
A boy is pushing a dresser with 12 N to the north. Another boy is pushing the dresser with 9 N to the north. What is the net force?
What is 21 N north
300
List 2 ways to increase the friction between 2 objects
What is increase force between the 2 objects and increase the roughness of the of the object
300
The name of the scientist who is credited with the "discovery" of gravity
What is Sir Isaac Newton
300
How much force is necessary to accelerate a 1250 kg car at a rate of 40 m/s2
What is
F = m x a
= 1250 kg x 40 m/s2
= 50,000 N
300
The unit that pressure is measured in
What is Pascal
400
This is required to change the speed or direction of an object.
What is an unbalanced force
400
What is the purpose of adding salt and sand to an icy road
What is to increase friction
400
This is the value for gravity (v = g x t)
What is 9.8 m/s 2
400
According to Newton's 1st Law of motion an object at rest will remain at rest or an object in motion will remain in motion until what type of force acts on it
What is an unbalanced force
400
This is the principle that makes a ball thrown by a pitcher curve
What is Bernouli
500
This is how you know that forces are balanced and there is no motion.
What is when the forces total 0 Newtons
500
This is the type of friction that when a force is applied to an object but it does not cause the object to move. It can be overcome by applying a large enough force to it.
What is static friction
500
The velocity of an object that falls off a wall that took 2 seconds to hit the ground.
What is 19.6 m/s down
500
This is the momentum of an 120 kg ostrich that is running with a velocity of 16 m/s north.
What is
p = m x v
= 120 kg x 16 m/s north
= 1920 kg m/s north
500
The amount of pressure exerted by a 3,000 N crate that has an area of 2 m2
What is
Pressure = force/area
= 3,000 N / 2m2
= 1500 Pa