Newtons law an forces
A 5000kg truck and a 1000kg car are travelling at constant speeds and then collides. What is true about the Forces and acceleration on each?
5000 kg truck exerts a greater force on the 1000kg car, but the 5000kg truck will get a greater acceleration.
1.For a projectile, which velocity remains constant as long as air resistance is ignored?
Horizontal velocity
What is an object's change in momentum equal to?
the impulse acting on the object
What is the SI unit for acceleration
m/s^2
A 4 kg pendulum is pushed up from the ground with a velocity of 10 m/s. What maximum height will the pendulum reach?
5.1 meters
A 10kg box is moving across the floor with a constant speed. Which statement explains the mistake of this FBD?
A.Ff and Fa should be in the same friction.
B.Vectors Fa and Ff should have the same the same length.
C.Nothing wrong with this diagram
C.Nothing wrong with this diagram
2.Which of the following is an example of two-dimensional motion with constant acceleration?
A car moving on a straight road
A ball thrown at an angle
A pendulum swinging back and forth
A rocket launching into space
A car moving on a straight road
A bird carries a 0.2 kg apple at a height of 20 m above the ground as it flies at a velocity of 5 m/s. What is the total energy of the apple-Earth system?
41.7 joules
If an object has a constant velocity, what can be said about its acceleration?
The acceleration is constant
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?
19.6 Joules
Can you explain the difference between static friction and kinetic friction?
Static friction tries to prevent relative motion between two surfaces when the surfaces that are not moving relative to one another, whereas kinetic friction tries to reduce the relative motion between two surfaces.
Which of the following measurements is NOT a Scalar?
Time
Speed
Distance
Displacement
Displacement
Ms. Evers holds a 2.5 kg textbook at a height of 5 meters above the ground. What is the gravitational potential energy of the textbook-Earth system?
Therefore, the gravitational potential energy of the textbook-Earth system is
122.5 J
What is the difference between speed and velocity?
Speed represents the total distance covered, while velocity represents the change in position
How high does a 0.4 kg piece of cheese need to be raised above the ground for the cheese-Earth system to have a gravitational potential energy of 25 J?
64.29 meters
How does air resistance affect the motion of objects?
decreased rate of acceleration
A car accelerates from rest at a rate of 5 m/s^2 for 10 seconds. What is the final velocity of the car?
Vf = 50 m/s
Two cars of equal mass (1100 kg) and speed (36 km/h) collide head on in a completely inelastic collision. What is the vector sum of the momentum of the system of two cars after the collision?
0 kg.m/s
A rocket accelerates from rest to a speed of 100 m/s in 10 seconds. What is its average acceleration?
10m/s^2
If we consider a ball-Earth system where the mass of the ball is 2 kg and it is held at rest at a height of 3 meters above the ground, the gravitational potential energy of the system can be calculated as follows:
58.8 Joules
5. A baseball player throws a ball at an angle of 45 degrees with respect to the horizontal, and it reaches a maximum height of 10 meters. What is the initial velocity of the ball?
Vi = 14 m/s.
If you have set Cruise Control to 10 m/s what will happen to the kinetic energy and momentum of the truck as a result of the accumulating rain in the bed of the truck? You can assume that the road you are driving on has negligible friction and that you can ignore the effect of the rain droplets hitting the front of the vehicle.
The momentum of the truck increases, and the kinetic energy of the truck increases.
A ball rolls down a hill with an initial velocity of 5 m/s and comes to rest after traveling a distance of 30 meters. What is its deceleration?
5 m/s^2
What is the potential energy of a 500-gram object lifted to a height of 8 meters above the ground?
39.2 Joules.