What is the SI unit for acceleration?
m/s^2
A ball was spinning around on a string of a certain radius at a constant speed. Then it went around the same curve at half of the original speed. Which of the following correctly identifies the new force acting on the ball?
The new force exerted on the car towards the center of the curve was one-half as much as before
Which of the following measurements is NOT a Scalar?
Displacement
What is the formula for work?
W = fd
What is an object's change in momentum equal to?
The impulse acting on the object.
What is the difference between speed and velocity?
Speed is a scalar quantity, while velocity is a vector quantity
Which FBD below shows the object moving with a constant speed?
The answer is A
For a projectile, which velocity remains constant as long as air resistance is ignored?
Horizontal velocity
An 8 kg dog is running at 4 m/s. What is the kinetic energy of the dog?
64J
What is the formula for Momentum?
P = mv
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
Rank the Magnitude from least to greatest.
D<C<B<A
The horizontal acceleration of a projectile is ALWAYS
Zero
What is the kinetic energy of a 60 kg man running at 8 m/s?
1920J
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 formula for Average Velocity?
Average Velocity= Displacement/Time
A truck is turning a curve of 100m radius at a velocity of 5m/s what is the centripetal acceleration of the truck?
0.25m/s^2
A football was thrown. The horizontal component of velocity was 25 m/s and the vertical component was 7 m/s . What is the magnitude of the resultant velocity of football?
32m/s
What is the formula used to find Kinetic energy?
K = 1/2mv^2
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
What is the average acceleration of an object that changes its velocity from 30 m/s to 70 m/s in 12 seconds?
3.33 m/s^2
If a truck of 130kg is traveling around a curve of radius of 50m at a velocity of 30 m/s, what is the centripetal force of the truck?
2340N
A soccer ball was kicked. The horizontal component of velocity was 50 m/s and the vertical component was 25 m/s . What is the magnitude of the resultant velocity of soccer ball?
75m/s
An 64 kg car is driving at 12 m/s. what is the kinetic energy of the car?
4608J
An object is 300 kg and is moving at 10 m/s. What is the linear momentum of the object?
3000 kg m/s