Show:
1
2
3
4
5
100
____is the transfer of energy that occurs when a force is applied over a distance.
Work
100
The kinetic energy of an object depends on its ____________ and __________.
Mass, Speed
100
A system of object’s ________ energy is the total of its kinetic energy and potential energy.
mechanical
100
_________is thermal energy moving from a region of higher temperature to a region of lower temperature.
heat
100
Due to ___________, when surfaces rub together, some mechanical energy always transforms to thermal energy.
friction
200
Energy due to the motion of particles that make up an object.
thermal energy
200
Energy stored in objects that are compressed or stretched.
elastic potential energy
200
Energy stored and released in the nucleus of an atom.
nuclear energy
200
Energy stored in the bonds between atoms.
chemical potential energy
200
______ energy moves from warmer objects to cooler objects.
thermal
300
When you lift a box of books, you are doing__________ on the box.
work
300
The more__________ a moving object has, the more kinetic energy it has
mass
300
When an object’s potential and kinetic energy changes, its_________ energy changes.
mechanical
300
When a student lifts a backpack, the backpack’s_________ potential energy increases
gravational
300
When two substances rub together,___________ causes mechanical energy to be transformed into thermal energy.
friction
400
A car moves at a constant speed for three hours. Its motion can be shown on a distance-time graph with a A. horizontal line. B. bent line sloping upward. C. straight line sloping upward
C
400
A speed-time graph shows a line sloping downward. This means that an object is A. not moving. B. speeding up. C. slowing down
C
400
Which situation describes a contact force acting on an object? A. a baseball bat hitting a baseball B. electrical force making hair stand on end C. gravity pulling a dropped book downward
A
400
On a speed-time graph, what is indicated by the distance between the x-axis and the line representing motion? A. the speed of the object B. how long the object has been in motion C. the direction in which the object is moving D. the object’s position relative to a reference point
A
400
What additional information is needed to determine the velocity of an object moving at 3 km/h? A. the mass of the object B. the direction of motion C. the size of the net force acting on the object D. the object’s displacement from the reference point
B
500
________forces result in a net force of 0 N.
Balanced
500
The force of ________between two objects is determined by their masses and the distance between them.
gravity
500
_______forces always cause a change in velocity.
unbalanced
500
According to Newton’s second law, an object’s ________is related to its mass and the net force acting on it
acceleration
500
The________ is the sum of all the forces acting on an object.
net force