Intro to Physics FINAL Review -- Motion, Forces, and Momentum

Question 1

An object with a mass of 3 kg has a momentum of 75 kg • m/s. What is its velocity?

Accepted Answer

25 m/s

Question 2

Which of the following has the greatest momentum?

Accepted Answer

2000 kg truck traveling at 9 m/s

Question 3

What is the momentum of a 1.5 kg metal disc, sliding on a frictionless surface at 0.75 m/s?

Accepted Answer

2.0 kg • m/s

Question 4

Which of the following is true?

Accepted Answer

Kinetic friction is usually less than static friction.

Question 5

Name the quote

Accepted Answer

P, a, r, t,...why...cause I gotta!

Question 6

A 1,000 kg meteor enters Earth's atmosphere with a velocity of 4,400 m/s. What's its momentum?

Accepted Answer

4,400,000 kg • m/s

Question 7

Mike, with a mass of 75 kg, is at 2.6 m/s. He hits Tom, with a mass of 125 kg and not moving.

Accepted Answer

Mike has a momentum of 195 kg • m/s north, and Tom has none.

Question 8

A racecar travels at an avg speed of 80 m/s in a race, for 640,000 m. How long to finish?

Accepted Answer

8000 s

Question 9

How long will it take a car to accelerate from 20 m/s to 26 m/s at a rate of 1.4 m/s^2

Accepted Answer

4.3 s

Question 10

What is the magnitude of the momentum of a 0.50 kg ball moving in a straight line at 5.0 m/s?

Accepted Answer

2.5 kg • m/s

Question 11

Which of these explains the difference between the two types of friction?

Accepted Answer

More force is needed to start an object moving than keep it.

Question 12

Which of the following will always change when an object accelerates?

Accepted Answer

velocity

Question 13

Which of the following will definitely cause a change in the velocity of a parked car?

Accepted Answer

The car experiences an unbalanced force.

Question 14

To calculate the momentum of a truck with velocity of 25 m/s east, it's also necessary to know

Accepted Answer

the mass of the truck

Question 15

A car is moving at 25 m/s north. Which of the following is a vector quantity?

Accepted Answer

The velocity of the car.

Question 16

Which of the following is a vector quantity?

Accepted Answer

force

Question 17

A student is driving her car when an insect hits her windshield. Which statement fits best?

Accepted Answer

The car and bug exert equal forces.

Question 18

Which of the following is a scalar quanitity?

Accepted Answer

The mass of a brick.

Question 19

The momentum of an object in space is _______.

Accepted Answer

dependent on its mass

Question 20

1500kg car experiences a forward force of 5000 N and air resistance of 1250 N. What's the acc.?

Accepted Answer

2.5 m/s^2

Question 21

A satellite orbiting the earth has constant speed, but not constant velocity. Why not?

Accepted Answer

The direction of the satellite's motion is always changing.

Question 22

A person who weighs 120 lbs stands on a scale. What force is the scale exerting on the person?

Accepted Answer

120 lb. up.

Question 23

Which of the following is a vector quantity?

Accepted Answer

A student walks 2.0 km north.

Question 24

A 600g basketball and 2 g table tennis ball are at the same speed. Which has a higher momentum?

Accepted Answer

The basketball

Intro to Physics FINAL Review -- Motion, Forces, and Momentum

Questions 24

Intro to Physics FINAL Review -- Motion, Forces, and Momentum

Questions 24