Work -Physics Exam Questions with
Correct Answers
More work in less time is the.. - ANSWER-Best way to increase power
Work is done when - ANSWER-Push or pull on object and it moves, also lifting
Work is - ANSWER-Transfer of energy, Joules
GPE - ANSWER-mgh - energy stored due to position
KE - ANSWER-.5mv2
What variables can affect KE and which affects it more - ANSWER-Mass and velocity;
velocity
Mechanical energy is - ANSWER-PE+KE
ME must remain - ANSWER-Constant, the potential it starts with will be the same
number for the kinetic later on
Energy is measured in the same units as - ANSWER-Work (J)
Mechanical advantage is - ANSWER-Number of times machine multiplies the effort
force
MA is calculated by - ANSWER-Resistance force over effort force
An ideal machine is when - ANSWER-Input equals output, efficiency equals 100%
Ideal machine advantage is - ANSWER-MA that doesn't include outside forces
IMA is calculated by - ANSWER-Effort over resistance force
Torque - ANSWER-Measure of how much a force acting on an object causes that object
to rotate
Where should a force be applied on a lever arm to produce most torque - ANSWER-
Most torque would equal the longest lever arm
Power equals - ANSWER-Work over time
Work equals - ANSWER-Force times distance
Correct Answers
More work in less time is the.. - ANSWER-Best way to increase power
Work is done when - ANSWER-Push or pull on object and it moves, also lifting
Work is - ANSWER-Transfer of energy, Joules
GPE - ANSWER-mgh - energy stored due to position
KE - ANSWER-.5mv2
What variables can affect KE and which affects it more - ANSWER-Mass and velocity;
velocity
Mechanical energy is - ANSWER-PE+KE
ME must remain - ANSWER-Constant, the potential it starts with will be the same
number for the kinetic later on
Energy is measured in the same units as - ANSWER-Work (J)
Mechanical advantage is - ANSWER-Number of times machine multiplies the effort
force
MA is calculated by - ANSWER-Resistance force over effort force
An ideal machine is when - ANSWER-Input equals output, efficiency equals 100%
Ideal machine advantage is - ANSWER-MA that doesn't include outside forces
IMA is calculated by - ANSWER-Effort over resistance force
Torque - ANSWER-Measure of how much a force acting on an object causes that object
to rotate
Where should a force be applied on a lever arm to produce most torque - ANSWER-
Most torque would equal the longest lever arm
Power equals - ANSWER-Work over time
Work equals - ANSWER-Force times distance
