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Feb 16 Test Review
Balanced & Unbalanced Forces, Simple Machines, & Energy Transformations
| Question | Answer |
|---|---|
| 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
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