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

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

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

The car and bug exert equal forces.

Which of the following is true?

Kinetic friction is usually less than static friction.

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

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

Which of the following has the greatest momentum?

2000 kg truck traveling at 9 m/s

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

The car experiences an unbalanced force.

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.

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

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Intro to Physics pt. 1 Final Exam Review -- Motion, Forces, and Momentum

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This is a final exam review for the first half of a 2 year introductory physics course. It covers vectors, Newton's Laws, and momentum.

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Questions 23

Answers

1
1500kg car experiences a forward force of 5000 N and air resistance of 1250 N. What's the acc.?
9.8 m/s^2
3.3 m/s^2
2.5 m/s^2
4.2 m/s^2
2
What is the magnitude of the momentum of a 0.50 kg ball moving in a straight line at 5.0 m/s?
10 kg • m/s
6.3 kg • m/s
0.1 kg • m/s
2.5 kg • m/s
3
A person who weighs 120 lbs stands on a scale. What force is the scale exerting on the person?
240 lb. up.
120 lb. up.
0 lb. up.
60 lb. up.
4
A 1,000 kg meteor enters Earth's atmosphere with a velocity of 4,400 m/s. What's its momentum?
4,400,000 kg • m/s
2,200,000 kg • m/s
44 kg • m/s
9,680,000,000 kg • m/s
5
A car is moving at 25 m/s north. Which of the following is a vector quantity?
The speed of the car.
The potential energy of the car.
The distance traveled by the car.
The velocity of the car.
6
Which of these explains the difference between the two types of friction?
More force is needed to start an object moving than keep it.
Less force is needed to start an object moving than keep it.
7
A 600g basketball and 2 g table tennis ball are at the same speed. Which has a higher momentum?
The basketball
They have the same momentum
You need more info
The table tennis ball
8
A student is driving her car when an insect hits her windshield. Which statement fits best?
The bug exerts a force, but the car does not.
The car exerts a large force and the bug exerts a small one.
The car exerts a force, but the bug does not.
The car and bug exert equal forces.
9
Which of the following is true?
Kinetic friction is usually equal to static friction.
Kinetic friction is usually less than static friction.
Kinetic friction is a force that resists starting a motion.
Static friction is usually less than kinetic friction.
10
An object with a mass of 3 kg has a momentum of 75 kg • m/s. What is its velocity?
25 m/s
7.1 m/s
0.4 m/s
72 m/s
11
A satellite orbiting the earth has constant speed, but not constant velocity. Why not?
The momentum of the satellite is too large.
The radius of the orbit is too large.
The force on the satellite is constantly decreasing.
The direction of the satellite's motion is always changing.
12
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
4.3 s
4.6 s
2.7 s
2.2 s
13
A racecar travels at an avg speed of 80 m/s in a race, for 640,000 m. How long to finish?
6,400,000 s
52,200,000 s
800 s
8000 s
14
Which of the following will always change when an object accelerates?
potential energy
mass
velocity
weight
15
Which of the following is a vector quantity?
temperature
mass
force
kinetic energy
16
What is the momentum of a 1.5 kg metal disc, sliding on a frictionless surface at 0.75 m/s?
1.1 kg • m/s
0.85 kg • m/s
0.50 kg • m/s
2.0 kg • m/s
17
Which of the following has the greatest momentum?
2000 kg truck traveling at 9 m/s
0.2 kg ball moving at 40 m/s
500 kg car traveling at 16 m/s
50 kg child skateboarding at 4 m/s
18
Which of the following is a scalar quanitity?
The velocity of a falling tennis ball.
The force required to lift a 10 kg mass.
The acceleration of a toy car.
The mass of a brick.
19
Which of the following will definitely cause a change in the velocity of a parked car?
All forces acting on the car decrease by 1 N.
The forces acting on the car are equal and balanced.
All forces acting on the car increase by 1 N.
The car experiences an unbalanced force.
20
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.
Mike has a momentum of 130 kg • m/s north, and Tom has none.
Mike has a momentum of 195 kg • m/s north, and Tom has none.
Both Mike and Tom have a momentum of 130 kg • m/s north.
Both Mike and Tom have a momentum of 195 kg • m/s north.
21
The momentum of an object in space is _______.
dependent on its potential energy
dependent on its mass
independent of its velocity
independent of its inertia
22
To calculate the momentum of a truck with velocity of 25 m/s east, it's also necessary to know
the mass of the truck
drive force of the motor
time elapsed
the distance the truck travels
23
Which of the following is a vector quantity?
An object has a mass of 10.5 kg.
a ball has an instantaneous speed of 15 m/s.
A 1.0 kg object moves at 18 m/s.
A student walks 2.0 km north.

Intro to Physics pt. 1 Final Exam Review -- Motion, Forces, and Momentum Flashcards | StudBud