G8 Forces and Motion

An object at rest will stay at rest. An object in motion will stay in motion until a force makes it change its motion.

• Newton's Second Law
• Newton's Third Law
• Newton's First Law

When an object is not moving a ______________ force is acting on it.

• Balanced
• Unbalanced

For every action force there is an equal and opposite reaction force. This is Newton's ___________ of motion.

• 2nd Law
• 4th Law
• 3rd Law

In order to for something to start moving a(n) _______________ force is needed.

• balanced
• rebalanced
• unbalanced

The more massive something is the more force is needed to move it is part of Newton's ___________ of motion.

• 1st Law
• 2nd Law
• 3rd Law

The formula for figuring out average speed is....

• Distance + Time
• Distance divided by time
• Time multiplied by Distance
• Distance - Time

One way to reduce friction is to

• make a smooth surface
• make a surface rough

_{If two teams have a tug-of-war and it ends in a tie, what forces are involved?}

• Balanced forces
• Unbalanced forces
• Weight and gravity
• Friction and gravity

Which observation BEST supports Newton's 2nd Law of Motion?

• It takes more force to move an elephant than it does to move a mouse
• An elephant will not move unless an outside force acts on it
• A mouse has less mass than an elephant
• Elephants are afraid of mice

Which observation BEST supports Newton's First Law of Motion (the law of inertia)?

• A ball will bounce more if it is thrown harder
• Friction is a force that changes speed and direction of motion
• Gravity is a force that pulls objects toward the Earth
• Something that is not moving will remain still unless an outside force acts on it