Forces Unit 1 Review

Imagine Charlotte, Aria, and Emma are playing a game of tug-of-war. What is the action they exert on the rope that might change its state of rest or motion?

• mass

• force

• velocity

• acceleration

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Emma and Zoe were having a friendly debate about physics in the parking lot. Suddenly, Emma's car gently backed into Zoe's parked car. Both were surprised to see dents on the bumpers! Why did this happen?

• Zoe's parked car was made of weaker material than Emma's moving car.

• Emma's moving car was made of weaker material than Zoe's parked car.

• When Emma's car bumped into Zoe's car, they collided with equal and opposite force.

• The bumpers of both cars would not have become dented as a result of this minor collision.

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Abigail and Benjamin are testing their new toy cars. They apply the same force to both cars, but Benjamin's car (B) is twice as heavy as Abigail's car (A). What happens to the acceleration of the cars?

• B's acceleration is half that of A.

• B's acceleration is twice that of A.

• B's acceleration is one-fourth that of A.

• B's acceleration is four times that of A.

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Arjun and Aria are having a friendly competition to see who can make a metal ball move on a flat surface. Which of these scenarios would help them win the challenge?

• The force of gravity becomes less.

• The force of gravity becomes greater.

• Two equal horizontal opposing forces act upon the ball.

• Two unequal horizontal opposing forces act upon the ball.

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Emma and Arjun are having a friendly science challenge. Emma places an index card across the top of a drinking glass and carefully balances a coin on top. Arjun, with a swift flick, sends the card flying sideways. To their amazement, the coin drops straight into the glass! Which scientific principle explains why the coin didn't follow the card?

• Newton’s 1st Law of Motion

• Newton’s 2nd Law of Motion

• Newton’s 3rd Law of Motion

• Newton’s law of universal gravitation

Imagine you're in an apple orchard with Noah, Aria, and Charlotte. What change could cause an apple hanging from a tree branch to fall?

• loss of gravity

• loss of a sideways force on the left

• loss of a sideways force on the right

• loss of the upwards force opposing gravity

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Olivia, Grace, and Daniel are having a fun science challenge! They want to know: Between which of these pairs of objects will the gravitational force be the smallest, if the objects are the same distance apart?

• a marble and a baseball

• a marble and a bowling ball

• a baseball and a bowling ball

• a bowling ball and a basketball

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Imagine Sophia, the adventurous skydiver, leaps out of a plane, zooming towards the earth at lightning speed. As she opens her parachute, she gracefully slows down. What mysterious force is pulling Sophia towards the ground?

• friction

• gravity

• air resistance

• parachute pull

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During a friendly tennis match, Sophia hits a tennis ball towards a wall. Which of these statements is true about the interaction between the ball and the wall?

• The tennis ball’s force is unopposed by the wall.

• The tennis ball’s speed doubles when it hits the wall.

• The wall exerts a force in the same direction as the tennis ball’s force.

• The wall exerts a force in the opposite direction to the tennis ball’s force.

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Hey Arjun, Ethan, and Kai! Can you figure out what a force is in the world of physics?

• A pull exerted on an object

• A measure of how heavy an object is

• A push or a pull exerted on an object

• A change in the direction of motion of an object