Motion

What is a force?

• a push or pull
• speed or acceleration 
• potential or kinetic energy
• balanced or unbalanced force

When objects remain in the same place, it is called...

• gravity
• friction
• balanced force
• unbalanced force

What is the force that causes everything to be pulled down to the Earth?

• friction
• gravity
• balanced
• unbalanced

An unbalanced force is when objects move in one direction because the force is greater from the opposite direction.

• true

• false

What pulls a ball back to earth?

• Gas
• Gravity
• Friction
• Molecules

An automobile you are riding in suddenly stops, why does your body continue to go forward?

• An object in motion stays in motion.

• Gravity pulls your body towards the earth.

• Friction makes your body slow down.

If you push a tennis ball, a bowling ball, and a basketball with the same amount of force, which one will go farthest?

• bowling ball

• tennis ball

• basketball

It is much more difficult to move a dresser full of clothes than an empty dresser. Why?

• An object in motion stays in motion.

• It takes more force to move an object with more mass.

• It takes more friction to move the empty dresser.

Why does a rolling ball stop?

• Gravity
• Friction
• Waterfalls
• Sand

An object is moving at a constant speed. The object changes direction & continues moving at the same speed. What caused the object to change direction?

• Inertia & gravity 
• Momentum 
• Change in speed 
• An outside force acted upon it