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# Janssen Physics Ch.4

### Mrs. Janssen's Chapter 4 Physics Test

What causes acceleration? force
What causes a moving object to change direction? force
What force exists between objects even in the absence of direct physical contact? field force
What is the unit for Newtons? kg*m/s2
What does the length of a force vector represent? magnitude of the force
A free body diagram does NOT represent what? forces exerted by the object
What direction does the arrow point in a vector diagram to indicate gravitational force? down
What is the tendency of an object to maintain its state of motion? inertia
A car goes forward along a level road at a constant velocity. What additional force is necessary to bring the car into equilibrium? zero
If a non-zero NET force is acting on an object, what is the object doing? accelerating
The acceleration of an object is directly proportional to what? net external force acting on the object
The acceleration of an object is inversely proportional to what? object's mass
Which are simultaneous equal but opposite forces resulting from the interaction of two objects? action-reaction pairs
Newton's Third law of motion involves the interaction of what? two objects and two forces
The magnitude of the gravitational force acting on an object is what? weight
What is a measure of the quantity of matter? mass
A change in the gravitational force acting on an object will affect the object's what? weight
Do the units of the coefficient of friction have an actual value? no
Created by: jjanssen33