Force & Motion Review Session

If no force is being applied to a stationary object, the object will...

• remain stationary.

• accelerate in the direction of the force.

• move at a constant speed in the direction of the force.

• accelerate in the opposite direction of the force

During an investigation on energy, Seth rolls marbles of four different masses down a ramp. Which size marble will have the greatest mass coming down the ramp?

• 2 grams

• 3 grams

• 5 grams

• 6 grams

Which statement best explains why a car that is rolling on a level surface will eventually come to a stop?

• Frictional forces oppose the motion of the car.

• The natural state of an object is to be at rest.

• Forward motion slowly runs out as energy is expended.

• Inertia acting on an object will dissipate.

Complete the sentence to match your observations: When you exert a stronger force on an object, you will see ________ change in velocity as compared to exerting a weaker force on the same object.

• a greater

• a weaker

• the same

Which of the following is NOT TRUE about friction:

• Friction is a force that acts in the opposite direction of motion.

• Friction slows objects down.

• There is no friction on earth.

• Friction on carpet is greater than friction on a bare floor.

Speed in a particular direction

• force

• velocity

• motion

Which of the following pictures models Claim 1: The thrusters caused the pod to move in the opposite direction.

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• 
• 
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Which of the following models claim 2: The thrusters only slowed the pod, it didn't stop. The pod hit the space station, which made it bounce and move in the opposite direction.

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• 
• 
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Three boats were moving across the surface of a lake. The gray and pink boats are a greater mass than the orange boat. Each boat was bumped by another boat. Which boat experienced the strongest force when hit? How do you know?

• The gray and pink boats because they are more massive, and all boats changed velocity by same amount.

• The pink boat - it's as massive as the gray boat and has the highest ending speed.

• All three - they all changed speed by the same amount.

• The gray boat - it takes more force to slow down an object than it takes to make it go faster.

In which crash did the puck experience a stronger force?

• The puck didn't experience a force. Only the paddles experienced force.

• Crash 2: The force of the purple paddle was stronger in this crash because it has more mass, so the force on the puck was stronger,

• The diagram doesn't tell you anything about the force on the puck.

• The puck experienced the same force in both crashes.