Which one of these has no direction?
A)force
B)acceleration
C)weight
D) mass
D) mass
100
Newton's third law says that for every action, there is an equal but opposite _______________.
What is reaction?
100
the type of friction that prevents an object from moving when a force is applied
What is static friction?
100
a machine that does work with only one movement
What is a simple machine??
200
the combination of all the forces acting on an object
What is net force?
200
An object is accelerated by a net force in which direction?
What is the direction of the force?
200
Newton's third law explains why a rocket flies. The rocket pushes gas molecules____________and the gas molecules push the rocket ____________.
What is downward and upward?
OR
What is backward and forward?
200
the type of friction that is due to the microscopic roughness of two surfaces
What is sliding friction?
200
a simple machine that has a flat, sloped surface (2 word answer)
what is an inclined plane?
300
An object will ______________when the net force is not zero.
What is accelerate or move
300
Newton's second law connects what three things?
What are force, mass and acceleration?
300
When the mass of one object is much ____________than another object, the action-reaction force is not noticeable.
What is larger or greater?
300
Friction can be reduced but never _______________.
What is eliminated or gotten rid of?
300
an inclined plane wrapped around a cylinder or post
What is a screw?
400
Any time forces are ____________, an object remains at rest.
What is balanced or zero
400
A net force of 4500 N acts on a car with a mass of 1500 kg. What is the acceleration of the car?
What is 3.0 meters per second squared
400
If a net force acts at an angle to the direction an object is moving, the object will follow a_________path.
What is curved or circular?
400
Which of the following is the force that slows a book that is moving across a table?
A)gravity
B)static friction
C)sliding friction
D) rolling friction
What is C) sliding friction?
400
a plank that pivots or rotates around a point (fulcrum)
What is a lever?
500
Two forces that stop almost everything are ______________ and ______________.
What are gravity and friction?
500
the speed an object reaches when the force of gravity is balanced by the force or air resistance is called ______
____________(2 words).
What is terminal velocity?
500
You push against a wall with a stick. The equal but opposite reaction is:
What is the wall pushes against the stick?
500
Applying the brakes uses _______friction to slow a vehicle down.
A)static friction
B)sliding friction
C)rolling friction
D) gravity
What is B) sliding friction?
500
a battery that lights up a bulb is an example of a (2 word answer, both begin with the letter "c")