Force, Motion, and Energy

Andrea is pushing a box on her driveway into her garage. She discovers that the box is hard to move. What could be a reasonable conclusion why the box is hard to move?

• The friction between the box and the driveway

• The motion of the box

• The way gravity affects the box

• The driveway is too smooth

Which of the following would increase the motion of a ball after it is kicked?

• A rocky surface

• A high, grassy surface

• A surface slopped uphill

• A surface sloped downhill

A long, round balloon is fastened to the end of a toy rocket. When the balloon is blown up and released, the rocket launches into the air. Which force causes the rocket to launch?

• The air released from the balloon

• The weight of the rocket

• The pull of gravity on the rocket

• The mass of the balloon

Which would be needed to make a ball at the base of a ramp move up the ramp?

• Gravity

• Inertia

• Force

• Friction

Which factor is most helpful in lowering an object with the use of a pulley?

• Friction, because it makes the object move at a constant rate

• Gravity, because it allows the object to resist any change

• Friction, because it helps speed up the object's movement

• Gravity, because it pulls down on the object

Carli is trying to determine if a force can change the direction of an object’s motion. The answer to which question will best help her come to a conclusion?

• What happens when a ball rolls down a hill?

• What happens when a moving wagon comes to a stop?

• What happens when a person pushes on a large brick wall?

• What happens when a bat is used to hit a ball?

When Anna tells her father that her bicycle is hard to pedal, he oils the chain. How does this make her bike easier to ride?

• Friction on the bike has decreased.

• Friction in the bike has increased.

• Gravity on the bike has decreased,

• Gravity on the bike has increased

Friction acts in a direction __________ to the direction of an object's motion

• Unrelated

• Opposite

• Equal

• Perpendicular

Unless an object at rest is acted upon by a force, it stays at rest due to its

• Matter

• Inertia

• Friction

• Gravity

Jake and Tom want to see who is strongest, so they got a rope and decided to play tug-o-war.  Both boys pulled at the rope with all of their strength, but neither of them moved.   This is called unbalanced force. 

• True

• False