Unit 1-Force & Motion

Which car is accelerating?

• a car that is unmoving

• a car that rounds a curve at a constant speed

• a car that travels in straight line at a constant speed

• a car that is set to a constant speed of 60 miles per hour

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Why does an object in motion stay in motion unless acted on by an unbalanced force?

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• because forces are what stop and start motion

• because balanced forces cannot exist in nature

• because motion is the inherent state of all matter

• because motion, once begun, continues to accelerate

Newton's First Law of Motion

• Your car breaks down. As your friends help you get out and push. the car starts moving slowly and gains speed.

• A tennis ball is rolling across the floor until Charlie kicks it.

• A bowling ball and a baseball roll across your foot at the same speed. The bowling ball hurts much more.

• When riding the bumper cars at the fair, you bump into your friend and your car bounces backwards.

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Choose all of the correct answers concerning speed. (Choose 3)

• The object in graph B was moving at a greater speed than the object in graph A.

• In graph B, the object is at rest for 5 seconds.

• The total distance travelled by the object in graph B is greater than the object in graph A.

• In graph A, the object travelled a distance of 40 meters in 4 seconds

• In both graphs, speed will be measured in meters/second.

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John and Caroline go out for a walk one day. This graph represents their distance from home.

Which statement accurately describes their walk?

• • They walked quickly, then they were still, then they walked slowly.

• • They walked forward fast, then they were still, then they walked backward slow.

• • They walked in one direction, then they were still, then they walked in the opposite direction.

• • They walked faster and faster until they walked at a constant rate, then they walked slower and slower.

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John and Caroline go out for a drive one day. This graph represents the distance they traveled over time.

During what part of their drive are they not moving?

• From 0 to 0.75 hours

• From 1.25 to 2.0 hours

• From 0.75 to 1.25 hours

• They are moving the entire time.

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NGSS.MS-PS3-1

Two platoons line up for a tug of war. If both platoons have the same number of participants on a team, what other factor is critical to either platoon's win?

• age of men

• height of men

• condition of the ground

• total mass of the team

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A wheelbarrow is experiencing two forces. One is pushing 25 N to the east and the other 25 N in the exact opposite direction. What must be true of the wheelbarrow's motion?

• It isn't accelerating.

• • It is slowing down.

• • It is accelerating.

• It is moving.

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NGSS.MS-PS2-2

A car travels north for 5 miles turns east for 5 miles, turns south for 5 miles, and finally west for 5 miles. What is the car’s displacement?

• • 20 miles, south

• • 0 miles, all directions

• • 5 miles north

• • 5 miles west

The law of inertia states that an object in motion will stay in motion, and an object at rest will stay at rest unless acted upon by an unbalanced force. Which law of motion is this describing?

• • Newton's First Law

• • Newton's Third Law

• • The law of gravity

• • Newton's Second Law