1 Dimensional Motion
If an object has a constant velocity, what can be said about its acceleration?
The acceleration is zero
If the car of 75kg is traveling around a curve of radius of 50m at a velocity of 15 m/s, what is the centripetal force of the car?
337
For a projectile, which velocity remains constant as long as air resistance is ignored?
Velocity is constantly changing
An 8 kg dog is running at 4 m/s. What is the kinetic energy of the dog?
k=64j
A large, moving truck crashes into a small parked car. How do the magnitudes of the impulses and the forces on each vehicle compare during the collision?
The truck experiences equal force and equal impulse
What is the SI unit for acceleration?
m/s
If the car is traveling around a curve of 50m radius at a velocity of 10 m/s, what is the centripetal acceleration of the car?
2m/s/s
Which of the following is an example of two-dimensional motion with constant acceleration?
A ball thrown at an angle
What is the kinetic energy of a 60 kg man running at 8 m/s?
k=190 j
A layer of padding is added to car dashboards because it can reduce some injuries during a collision. How does the padded dashboard make people safer?
it increases the time of impact during the collision
What is the average acceleration of an object that changes its velocity from 10 m/s to 30 m/s in 5 seconds?
4 m/s^2
A child riding a merry-go-round feels a centripetal force. How would the magnitude of the acceleration change if the velocity doubled (2x)?
quadrupled (4x)
The horizontal acceleration of a projectile is ALWAYS
zero
A 1 kg ball is held at rest at a height of 2 meters above the ground. What is the gravitational potential energy of the ball-Earth system?
u=19.62j
An object has a mass of 100 kg moving at 5 m/s. What is the linear momentum of the object?
500 kg m/s
:If you are riding on a bus with a friend, you can tell you are moving by observing the motion of objects like trees and houses outside the windows. What is your frame of reference for detecting the motion of the bus?
objects outside the windows
What law is applicable for the take off of the rocket?
Conservation of momentum
In a normal projectile motion, what will be the condition for maximum range?
θ = 45°
calculate the work done by a 47 N force pushing a pencil 0.26m.
12.2J
What is the vector sum of the momentum of the system of two cars after the collision?
0kg.m/s
What is a valid frame of reference for observing motion if you are riding on a bus with a friend?
objects like trees and houses outside the windows
When an object is at rest velocity and acceleration is zero.
object continues to be at rest
An object of mass 2000 g covers a maximum vertical distance of 6 m when it is projected at an angle of 45° from the ground. Calculate the velocity with which it was thrown.
Take g = 10 m/s2: 12.10 m/s
calculate the work done by 2.4 N force pushing a 400g table across the floor 0.75m wide
47m
What effect will the accumulating water have on the momentum and kinetic energy of the truck?
You can assume that the road you are