Balanced & Unbalanced Forces

What 2 things do all forces have?

• magnitude and direction

• speed and acceleration

• mass and velocity

• energy and momentum

When playing tug of war and neither side moves, forces are…

• unbalanced

• balanced

• multiplied

• unequal

In tug of war, when one team moves toward the other, what can be said about the forces?

• The forces are equal in magnitude and opposite in direction.

• The forces are unequal, with the winning team exerting a greater force.

• The forces act in the same direction.

• The forces cancel each other only partially.

When floating a ping-pong ball with a hairdryer, which two forces are balanced? Force pulling down: ___________________________ Force pushing up: ___________________________

• Force pulling down: Gravity, Force pushing up: Air pressure

• Force pulling down: Air pressure, Force pushing up: Gravity

• Force pulling down: Gravity, Force pushing up: Electric force

• Force pulling down: Centrifugal force, Force pushing up: Buoyancy

5. If the hairdryer was put on full power, then it would produce very hot air.

• It will produce very hot air.

• It will produce cold air.

• It will malfunction.

• It will not change.

When Dr. Jeff jumps on a skateboard and uses the fire extinguisher to move, which of these does he change to move BACK to where he started?

• amount of force

• type of force

• direction of force

• skateboard wheels

True or false: balanced forces are important for a hover board to float.

• True

• False

In Zoe’s egg drop experiment, which two forces are balanced that keep the egg from moving before she hits the pan?

• Gravitational force and Tension force

• Gravitational force and Normal force

• Air resistance and Tension force

• Normal force and Air resistance

True or false: the downward motion of the egg in Zoe’s experiment is due to unbalanced forces.

• True

• False

Izzy applied a force to the golf ball and it went in the right direction, so it didn’t go in the hole because:

• the force was insufficient

• the ball rolled off the green

• there was wind interference

• the hole was too distant