# Motion And Force: Question Preview (ID: 1299)

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**If Kim won a 400-m race in 80 s, her rate of speed was**

a) 10 m/s

b) 5 m/s

c) 2 m/s

d) 20 m/s

**A person in a head-on car collision, who is not wearing a seat belt, continues to move forward at the same speed of the car because of**

a) inertia

b) weight

c) friction

d) gravity

**NewtonвЂ™s first law of motion states that an object at rest stays at rest unless a _____ acts on it.**

a) balanced force

b) strong force

c) weak force

d) net force

**The amount of gravitational force between objects depends on their**

a) frictional forces

b) inertia

c) speed and direction

d) masses and the distance between them

**The relationship among mass, force, and acceleration is explained by**

a) Newton's 1st Law of Motion

b) Newton's 2nd Law of Motion

c) Newton's 3rd Law of Motion

d) the law of conservation of momentum

**Acceleration due to gravity is**

a) 9.8 meters per second

b) 98 meters per second squared

c) 9.8 meters per second squared

d) 98 meters per second

**In the absence of air, a penny and a feather that are dropped from the same height will**

a) fall at different rates

b) float

c) fall at the same rates

d) not have momentum

**What is the force of an object that has a mass of 10 kg and an acceleration of 2 m/s2?**

a) 2 N

b) 5 N

c) 20 N

d) 50 N

**What is the rate of change of speed and/or direction?**

a) acceleration

b) gravity

c) net force

d) inertia

**What is the momentum of an object that has a mass of 10 kg and a velocity of 25 m/s?**

a) 2.5 kg x m/s

b) 250 kg x m/s

c) 2500 kg x m/s

d) 25 kg x m/s

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