Physics True/False

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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


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