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# Feb 16 Test Review

### Balanced & Unbalanced Forces, Simple Machines, & Energy Transformations

What affects gravitational potential energy? An object's height and weight
How can you increase the gravitational potential energy of an object? Increasing the height and/or weight will increase the gravitational potential energy
What is kinetic energy? Kinetic energy is the energy of motion
What affects the kinetic energy of an object? An object's speed and mass
How can you increase an object's kinetic energy? Increasing the speed and/or mass will increase an object's kinetic energy
What is an energy transformation? When energy changes from one form to another
What energy transformation takes place in solar panels? radiant energy to electric energy
What causes a resting object to move? unbalanced forces change an object's motion; net force is not equal to zero
What results from balanced forces? Balanced forces cause no change in motion; net force is equal to zero
What is net force? Net force is the sum of all objects acting on an object
What happens when unbalanced forces act on an object? the object moves in the direction of the greater force
What are simple machines? Simple machines make work seem easier
How do simple machines affect work? Simple machines change the amount, direction, or distance of the effort force
What is mechanical advantage? A simple machine's mechanical advantage measures how much the machine affects the force needed to do work. It measures the benefit of using the machine.
How do you increase an inclined plane's mechanical advantage? Make the ramp longer and less steep
How do you make a pulley system most beneficial? A system with more pulleys and longer ropes has the greatest mechanical advantage
How does one pulley affect work? One pulley changes the direction of the force
What happens to force as the length of a ramp increases? The force needed to do work will decrease when the ramp length increases
Does it require less force to lift an object straight up or pushing/pulling a load up a ramp? Less force is needed to push or pull an object up a ramp
What is the law of conservation of energy? This law states that energy cannot be created or destroyed; it only changes form
What energy transformation occurs in a battery-powered laptop? chemical PE to electric KE to light and sound KE
What energy transformation occurs when an electric fan is used? electric KE to mechanical and sound KE
What is the speed of an object moving 50 miles in 10 hours? speed = distance/time speed = 5 miles per hour
Created by: marybuchholz