Physics True/False
Vector measurements have both magnitude and direction.
True
Scalar measurements have both magnitude and direction.
False- no direction
Force and acceleration are related in a linear fashion.
True
In a chosen coordinate system, the position of an object in motion can have negative values.
True
Acceleration can never be negative.
False
Acceleration is the rate at which an object's speed changes.
False
Centrifugal force is center-seeking acceleration.
False
Centripetal acceleration is a scalar quantity.
False
Force is a scalar quantity,
False
In a chosen coordinate system, the time interval of an object in motion can have a negative value.
False
It is not possible to derive an equation of motion for uniform acceleration without a time variable.
False
Joe and Sadie are supposed to meet at 3 P.M. in Springfield, which is 150 km away from where they live. Joe leaves home at noon, traveling 50 km/hr. If Sadie leaves home at 1:30 P.M. and travels at 75 km/hr, she will meet Joe in Springfield on time.
False
Projectile motion in two dimensions cannot be determined by breaking the problem into two connected one-dimensional problems.
False
Static friction is exerted on one surface by another when the two surfaces are moving relative to each other.
False
The direction of a vector is defined as the angle that the vector makes with the x-axis, measured clockwise.
False
The force of friction depends on the amount of surface area in contact between the two surfaces.
False
The horizontal motion of a horizontally launched projectile affects its vertical motion.
False
The position-time graph of an object moving with a constant velocity is never a straight line.
False
The reading on a speedometer represents the average velocity of the car.
False
The slope of a position-time graph of an object gives the speed of the object.
False
The velocity vector of an object with a centripetal acceleration is never tangent to the circular path.
False
The y-intercept of a position-time graph of an object gives the average velocity of the object.
False
When a force is a push, the force arrows in a free body diagram point towards the particle.
False
A Newton is the amount of force applied to a 1 g object that will cause it to have an acceleration of 1 km/s^2.
True
A ball that is dropped will hit the ground at the same time as a ball that is thrown horizontally with an initial velocity of 2 m/s.
True
A collision between two moving objects can be represented on a position-time graph.
True
A free-body diagram represents forces acting on a system.
True
A time interval is a scalar quantity.
True
Acceleration is a vector quantity.
True
Average speed is a scalar quantity.
True
Multiple vectors can be added together by adding their x-components into one horizontal vector, then adding their y-components into one vertical vector, and finding the vector sum of those 2 vectors.
True
Projections of a vector make up the components of that vector.
True
Static friction is exerted on one surface by another when there is no motion between the surfaces.
True
The acceleration of an object in uniform circular motion always points toward the center of the circle.
True
The acceleration of an object is the slope of its velocity-time graph.
True
The area under a velocity-time graph is the displacement of the object.
True
The average velocity is defined as the ratio of the change of position to the time interval during which the change occurred.
True
The displacement of an object can be calculated by multiplying its velocity and the time interval.
True
The key to successfully solving two-dimensional relative velocity problems is drawing the proper triangle to represent all three velocity vectors.
True
The net force on an object is the resultant of the force vectors.
True
The objects represented by line C and line D have the same acceleration.
True
The position-time graph of an object moving with a constant average velocity is always a straight line.
True
The process of breaking a vector into its components is called vector resolution.
True
The sign associated with g, the acceleration due to gravity, depends upon the choice of the coordinate system.
True
The velocity-time graph of an object in motion with both positive acceleration and zero initial velocity would be a line beginning at the origin and having positive slope.
True
Vectors can be summed by separately adding the x- and y-components.
True
When an object moves in a circle, the net force toward the center of the circle is the centripetal force.
True
