# AP Physics with Hansenator - Kinematics and Forces Quiz

#### True/False (3 Points Each)

____ 1. Displacement is how far an object travels from its initial position.

____ 2. If a car travels around a track once, of radius 1, and stops, then its displacement is 2π.

____ 3. Acceleration is a change in distance over time.

____ 4. The slope of a velocity versus time graph is the acceleration.

____ 5. The area under a velocity versus time graph is the acceleration.

____ 6. Time (t) is usually the x-axis, or the independent variable.

____ 7. After two seconds of an object falling on Earth its speed is 19.6 m/s.

____ 8. When an object slows down the acceleration is negative.

____ 9. Acceleration due to gravity is -9.6 m/s^2.

____ 10. When an object speeds up, its acceleration is in the direction of motion.

____ 11. is a proper kinematic equation.

____ 12. is an equation for displacement.

____ 13. If I kick a ball at an angle of 45°, then the vertical speed is constant.

____ 14. If I kick a ball at an angle of 45°, then the horizontal speed is constant.

____ 15. An unbalanced force on an object causes an acceleration.

____ 16. The equation for force is F=ma. This is also known as Newton’s Second Law.

____ 17. If an object is in equilibrium (zero acceleration), then there are no forces acting on it.

____ 18. Force is measured in Newtons.

____ 19. The unit for Newtons is kg*m/s^2.

____ 20. Forces acting in the same direction add together.

____ 21. If I shoot a bullet horizontally from 1 meter high and drop a ball from the same height, then they will land at the same time.

____ 22. The weight of an object is the acceleration of gravity times the mass.

____ 23. Kilograms is the typical measure of mass.

____ 24. Normal force is always equal to the weight of an object.

____ 25. Normal force is how hard the surface presses back up on an object.

____ 26. A diagonal force needs to be broken up into x and y-components.

____ 27. The x component of a velocity is found with .

____ 28. A free body diagram is a visual representation of forces on an object.

____ 29. Friction is a force that acts in the same direction of the motion.

____ 30. Gravity is calculated with the equation g=G m/r.

#### Short Answer (50 Points Each)

A car accelerates from 0 m/s to 60 m/s in 4 seconds.

How far did the car go in this time?

How long did it take the car to go 10 meters? (Hint find the acceleration first)In your own words, what is the difference between velocity and acceleration?

A car drives around a circular track with radius 20 meters in 12 seconds.

What is the distance around the track?

What is the linear speed of the car?

What is the centripetal acceleration?

## Solutions

1 T 2 F 3 F 4 T 5 F 6 T 7 T 8 T 9 F 10 T

11 T 12 T 13 F 14 T 15 T 16 T 17 F 18 T 19 T 20 T

21 T 22 T 23 T 24 F 25 T 26 T 27 F 28 T 29 F 30 F

Velocity is the change in distance over time, but acceleration is the change in velocity over time. Accelerations can be thought of as m/s per second.

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splash-of-angs63 (49)7 years agoAh kinematics here! :p

'I think displacement is the change in position of an object.'

I mean initial to final point can be determine as the total path length and in that case it will be distance not displacement.

Indeed it is a very nice post @hansenator. Good job!

hansenator (57)7 years agoYou're right, but if it is a curved path, it takes some calculus. Haha. Your are doing well on Steemit splash, I'm glad for you!

rufans (68)7 years agoThank you for this wonderful lecture once more 👍

Welcome back .

hansenator (57)7 years agoYes. I took a break this past week. Haha. Good to see you too!

rufans (68)7 years agoOh yea ,I noticed .

Was wondering were you at 😁.

clumsysilverdad (64)7 years agothis is not recreation for many ... but i have weird hobbies too, so I guess it's all good (-:

hansenator (57)7 years agoYeah. Haha. I don't know if I would call it recreation, but it's for future reference. If I post all of my lesson plans here then I don't have to remake them next year.