21 terms

The Newton's Second Law

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What is the cause of acceleration?
Unbalanced forces/ A net force greater than zero.
A combination of all the forces that act on an object
Net force
Forces of 14N and 6N in the same direction act on an object. What is the net force on the object?
20N
If the forces on an object are 3N in one direction and 15N in the opposite direction, what is the net force exerted on the object?
12N
If the force on an object doubles, then the acceleration
Doubles
To find the net force on an object when two or more forces are pushing or pulling the opposite direction, you must
subtract
To find the net force of an object when two or more forces are pushing or pulling in the same direction, you must
add
Twice as much mass = _____ the acceleration
1/2
If the net force of an object doubles, then the acceleration _____________
doubles
If the mass of an object doubles, the acceleration is
halved
If mass and force both double then the acceleration is
unchanged
Suppose a cart is being moved by a certain net force. If a load is added to the cart so that its mass is doubled, by how much does its acceleration change?
acceleration is halved
A force that always acts in a direction to oppose motion
Friction
If you push something to the right, the friction always goes to the
left
Acceleration
A change in the motion of an object.
Newton's Second Law
a net force acting on an object produces an acceleration that is directly proportional to the net force and inversely proportional to the mass
Net Force
the sum of all forces acting on an object
constant velocity occurs when...?
the NET FORCE and ACCELERATION will both be ZERO
friction
resistive force--acts against motion
caused by the interaction of surface irregularities
Forces in the same direction are....?
added together
Forces in opposite direction are...?
subtracted from one another