Physics - Unit #7.1 Energy

Changes in an object's motion depend on:

• how long the force acts

• force

• force and how long

  the force acts

How long means: ________________

The quantity (force x time) means: ____

How long not always mean time, it can mean _______ also.

Is the effort exerted on something that will change is energy.

When we lift a load of gravel against Earth's gravity, we do ______.

The heavier the load or the higher we lift the load, the _____ work we do.

• less

• neutral

• more

Two things enter the picture whenever work is done:

• In an object's motion depend on both, on how long the force acts and force.

• The heavier the load or the higher we lift the load, the more work we do.

• The application of the force and the movement of something by that force.

Work is the product of only the component of force that acts in the __________ and _________.

• direction of motion

• direction of motion distance moved

• none of the above

• distance moved.

If a force acts at an angle to the motion, the component of force parallel to the motion is multiplied by the distance moved.

• false

• true

• none of the above