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CRCT Review. Motion & Forces. What happens to the motion of an object when the forces acting on it are balanced?. A) The motion changes direction. B) The motion does not change. C) The motion speeds up. D) The motion slows down.

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## CRCT Review

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**CRCT Review**Motion & Forces**What happens to the motion of an object when the forces**acting on it are balanced? • A) The motion changes direction. • B) The motion does not change. • C) The motion speeds up. • D) The motion slows down.**What happens to an object if the forces acting on it are**unbalanced? • A) Its motion changes. • B) The net force is zero. • C) Its motion does not change. • D) The object always comes to a stop.**How is an object’s mass related to the force needed to**accelerate the object? • A) mass is not related to the force needed. • B) The smaller the mass, the greater the force needed. • C) The greater the mass, the greater the force needed. • D) The greater the mass, the smaller the force needed.**A student pushes four different balls with a pool cue stick.**Which ball has the GREATEST inertia? • A) 4 gram ball • B) 15 gram ball • C) 2 gram ball • D) 10 gram ball**A person produces the LEAST friction moving across which of**these surfaces? • A) carpet • B) ice • C) sand • D) wood floor**Air resistance is an example of ____.**• A) gravity • B) a noncontact force • C) a net force • D) friction**Your mass increases as you grow. How does this affect the**gravitational attraction between you and other objects? • A) The force increases. • B) The force decreases. • C) The force stays the same. • D) The force does not change without change in distance.**Which two factors affect the gravitational attraction**between two objects? • A) density and friction • B) density and distance • C) mass and friction • D) mass and distance**What does a simple machine do?**• A) It makes work easier. • B) It increases the amount of work done. • C) It decreases the amount of work done. • D) It increases both the force and distance involved in work.**Which of the following simple machines is a wedge?**• A) wheelbarrow • B) doorknob • C) ax • D) truck ramp**Which of the following CANNOT overcome an object’s**inertia? A) an unbalanced force B) a zero net force (balanced force) C) gravity D) friction**Two objects move closer together, what happens to the**gravitational attraction between them? • A) it increases • B) it decreases • C) it doesn’t change • D) it becomes zero**Which of the following is a simple machine?**• A) bicycle • B) jar lid • C) scissors • D) can opener**Which of Newton’s Laws explains the bumper car ride at an**amusement park. • a.Newton’s 1st Law • b.Newton’s 2nd Law • c.Newton’s 3rd Law • d.Newton’s Law of Gravitation**How do you know an object has moved?**• A) it flies • B) it rolls • C) it changes position • D) it can be measured**What is the average speed of an object that travels 100**meters in 20 seconds? • A) 4 m/s • B) 8 m/s • C) 5 m/s • D) 10 m/s**Which of the following is a unit of speed?**• A) h • B) km • C) m/s • D) m/s2**A runner takes 1.5 hours to complete a 6 km route. What is**the jogger’s average speed? • A) 2.5 km/hr • B) 4.0 km/hr • C) 7.5 km/hr • D) 9.0 km/hr**Which of the following is NOT needed to determine the**velocity of a moving truck? • A) The mass of the truck. • B) The distance it travels. • C) The time it takes to travel that distance. • D)The direction in which the truck is traveling.

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