Physics Exam 1 Flashcards

The slope at a point on a position-versus-time graph of an object is

the object’s instanteous velocity at that point

The area under a velocity-versus-time graph of an object is

the displacement of the object

The slope at a point on a velocity-versus-time graph of an object is

the object’s instantaneous acceleration at that
point

Suppose we define the y-axis to point vertically upward.
When an object is in free fall, it has acceleration in the y- =direction

ay= –g, where g= +9.80 m / s²

At the turning point of an object

the instantaneous velocity is zero

A 1-pound block and a 100-pound block are placed side by
side at the top of a frictionless hill. Each is given a very light
tap to begin their race to the bottom of the hill. In the
absence of air resistance

they tie

The slope at a point on a position-versus-time graph of an
object is

the object’s velocity at that point

A ball is tossed straight up in the air. At its very highest point,
the ball’s instantaneous acceleration asub
y is

negative

free fall acceleration

9.80m/s² (downward)

vector

a quantity that has both size and direction

vector decomposition

break the vector into pieces parallel to the axes

What is a “net force?”

The vector sum of all forces acting on an object

What is the name of a diagram used to show all forces acting on an object?

Free-body diagram

Contact force

forces that act on an object by
touching it at a point of contact

transfer forces/ long range forces

forces
that act on an object without
physical contact

spring force

elastic object
is flexed or deformed in
some way, and then
“springs” back to its original
shape when you let it go,
this is a spring force

A steel beam hangs from a cable as a crane lifts the beam. What forces act on the beam

Gravity and tension in the cable

A bobsledder pushes her sled across horizontal snow to get it going, then jumps in. After she jumps in, the sled gradually slows to a halt. What forces act on the sled just after she’s jumped in

Gravity, a normal force, and kinetic friction

Static friction

contact force that keeps an
object “stuck” on a surface,
and prevents relative
motion

A constant force causes an object to accelerate at 4 m/s²
What is the magnitude of the acceleration of an object with
twice the mass that experiences the same force?

2m/s²

A ball is thrown upward at a 45° angle. In the absence of air resistance, the ball follows a

parabolic curve

For uniform circular motion, the acceleration

points toward the center of the circle