1D Motion
Newton's law and forces
Momentum
2D Motion
100
(Z) What is the difference between speed and velocity?
Speed represents the total distance covered, while velocity represents the change in position
100
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?
5000kg truck exerts a greater force on the 1000kg car, but the 5000kg truck will get a greater acceleration.
100
Use the scenario to answer the following question.
A student hits a hockey puck with a hockey stick and the puck speeds up. Another student claims that the student broke the Law of Conservation of Momentum because the puck gained momentum.
Which of these is the BEST explanation of why the Law is not broken in this closed system?
The force on the puck cancels the force on the hockey stick because the forces are equal and opposite
100
Which of the following measurements is NOT a Scalar?
Displacement
200
(Z) If an object has a constant velocity, what can be said about its acceleration?
The acceleration is increasing
200
Kids were playing with balls which are of equal mass. They kicked them with different forces. Which one accelerated more?
Red ball – 10N
Blue ball – 3N
Yellow ball - 5N
Red ball since force and acceleration are directly related
200
Use the information and picture to answer the following question.
Students were tasked with dropping a 0.2 kg bag of marbles straight down into a 1.0 kg toy cart moving at 3.0 m/s. The students compare the velocity of the cart before and after the marbles are dropped.
toy cart
How did the addition of the bag of marbles affect the velocity of the cart?
The cart slowed down because it now contained more mass. The momentum of a closed, isolated system is always constant
200
For a projectile, which velocity remains constant as long as air resistance is ignored?
Total Velocity
300
(Z) Which of the following represents a negative displacement?
An object moving backward
300
A = 40kg B = 2kg C = 10kg
Which one has more acceleration? Hint: a = net F/m
A - since it has more net force and more mass. a= 400/40 = 10m/s/s
300
A student watched a person fire an old cannon. The student noticed the cannonball moved with a very high velocity to the right and the cannon moved very slowly to the left.
Which statement BEST explains the student's observations?
The total momentum of the system was zero before the cannon was fired. Since momentum was conserved, the cannonball's momentum and the cannon's momentum must have been equal in magnitude but opposite in direction
300
A football is kicked across the field. Which of the following is true
The acceleration of the ball decreases as the ball moves upward
400
(Z) Which of the following represents the relationship between velocity and time for an object moving with constant acceleration?
A linear graph
400
Rank the magnitude of acceleration from least to greatest?
A B C D
A>B>C>D
400
Use the information and diagram to answer the following question.
A box collides with a ball as shown in the diagram.
After the collision, what will the final momentum of the ball be?
18 kg m/s because in an open system, the system's momentum is not conserved
400
A football was kicked toward the goal. The horizontal component of velocity was 10 m/s and the vertical component was 7 m/s . What is the magnitude of the resultant velocity of the soccer ball?
17 m/s
500
(Z) What is the SI unit for acceleration?
m/s
500
Which FBD below shows the object moving with a constant speed?
C
500
A stunt person jumps from the roof of a tall building, but no injury occurs because the person lands on a large, air-filled bag. Which one of the following BEST describes why no injury occurs?
The bag provides an impulse greater than the person's change in momentum by decreasing the time of impact.
500
Consider a ball thrown up from the surface of tl1e earth into the air at an angle of 30° above the horizontal. Air friction is negligible. Just after the ball is released, its acceleration is:
Downwards at 9.8 m/s2