A place or object used for comparison to determine if an object is in motion is called a) reference point b) constant speed c) velocity d) distance
a) reference point
Average speed is calculated by dividing ____. a) velocity/time b) acceleration/time c) distance/time d) displacement/time
c) distance/time
The force that opposes the weight of an object resting on a flat surface is the _____ force. a) friction b) normal c) gravitational d) magnetic
b) normal
A ball held at the top of a slide has ________________.
a) potential energy b) kinetic energy c) work d) chemical energy
a) potential energy
The total momentum of a ______ is conserved.
a) collision b) closed system c) open system
b) closed system
A ________ has both magnitude and direction.
a) vector b) scalar c) position d) reference point
a) vector
An object has a negative acceleration, this means it is ______.
a) slowing down b) speeding up
a) slowing down
If gravity did NOT affect the path of a horizontally thrown ball, the ball would ____. a) go straight up b) fall straight down c) follow a curved path d) travel horizontally
d) travel horizontally
When you kick a soccer ball it has __________ energy.
a) kinetic b) potential c) mechanical d) chemical
a) kinetic
The total kinetic energy of the system is conserved in an ______ collision. (KEi = KEf)
a) elastic b) inelastic c) explosion d) perfectly inelastic
a) elastic
Energy is the ability to do ________.
a) nothing b) potential c) inertia d) work
d) work
What would constant velocity look like on a position vs time graph? a) curved line b) horizontal line only c) straight line
c) straight line
The upward force on an object falling through the air is a) inertia b) air resistance c) momentum d) terminal velocity
b) air resistance
A volleyball, bowling ball, ping pong ball, and a marble are rolling down a slope. The ball with the greatest kinetic energy is ________.
What is the bowling ball?
If the velocity of an object doubles, the momentum _____.
also doubles (remember p = mv)
__________ is the tendency of an object to keep moving or stay at rest.
a) friction b) force c) inertia d) gravity
c) inertia
The path of projectile motion is a) curved b) always horizontal c) always vertical d) straight
d) curved
The size of the gravitational forces between two objects depends on their a) frictional forces b) inertia c) masses and distance between them d) speed and direction
c) masses and distance between them
The formula to find kinetic energy is _____.
KE = (1/2)mv2
Which two conditions must be met in order to have a closed (isolated) system?
constant mass; The mass of the system must remain constant during the interaction.
net force = 0; The net external force on the system must be zero.