Force and Motion

A change in speed/velocity.  The Speed/Velocity is increasing or decreasing.

• Mass
• Acceleration
• Force
• Motion

A change in speed/velocity.  The Speed/Velocity is increasing or decreasing.

• Balanced Force
• Unbalanced Force
• Force
• Motion

A comet traveling at constant speed through space.

• Balanced
• Unbalanced

A car moving at a constant speed.

• Balanced
• Unbalanced

Which of the following is an example of an unbalance force?

• A skier accelerating down hill.
• 2 students pushing on opposite sides of the door with equal force.
• A fish swimming at a constant rate in the ocean.
• A ping pong ball maintains a constant position above the blowing blow dryer.

Which is the best description for an unbalance force?

• An object at rest.
• When a force has the same mass as another force.
• When one force is acting on the other is greater than the other.
• When one object does not move or move at a constant speed.

An 18-Wheeler and a small car are traveling at the same speed.  Both apply their brakes at the same time.  Which is true?

• The truck will stop faster because it has more mass.
• The car will stop faster because it has less mass.
• The truck will stop faster because it has less mass.
• The car will stop faster because it has more mass.

What is the force needed to accelerate a .42 kg football at a rate of 40 m/s²?

• 9.52 N
• 95.2 N
• 1.68 N
• 16.8 N

The girl is pushing the cart at a constant speed of 3 m/s.

• Balanced Force
• Unbalanced Force

The girl is pushing the cart at a constant speed of 3 m/s.  She increases her force to 35 N.

• The cart will remain balanced.
• The speed of the cart will increase and become unbalanced.
• The speed of the car will decrease and become unbalanced.
• The speed of the car will increase but remain balanced.