Science - simple machines

What is a force? (Choose the best answer)

• A push/pull that moves an object or holds it in place

• A push that moves an object

• A pull that holds it in place

• A push/pull that moves an object.

________ is a measure of the force of gravity on an object

• Weight

• Force

• Friction

• Equilibrium

True or False: The smoother the surface, the more friction there is between the objects

• True

• False

A change in height between two points is called a _________

• slope

• pulley

• screw

• axle

Moving an object up a ramp requires less force than moving an object across a flat surface

• False

• True

If you increase the slope of a ramp, the amount of force you need to move an object up the ramp _______

• increases

• decreases

• stays the same

True or False: If you ride down a hill, you need to use more force

• True

• False

True of False: If you bike up a hill, you need to use more force than biking down.

• True

• False

Load is the weight of the object you are trying to move. The ________ the load, the more force you need to move.

• larger/bigger/heavier

• smaller/lighter

When two forces of equal strength act in opposite directions, they are called _______

• balanced forces

• unbalanced forces

• gravity

• friction