|1.||Which of the following best represents the momentum of a small car
travelling at a city speed limit?
|2.||A 0.080 kg tennis ball travelling east at 15 m/s is struck by a tennis
racquet, giving it a velocity of 25 m/s, west. What are the magnitude and
direction of the impulse given to the ball?
|3.||Which of the following describes kinetic energy and momentum before
and after a perfectly elastic collision?
|4.||The 2.0 kg head of an axe strikes a tree horizontally at 40 m/s. The
blade penetrates 0.040 m into the tree. What is the average force exerted
by the blade on this tree?
|5.||A 900 kg car travelling at 12 m/s due east collides with a 600 kg car
travelling at 24 m/s due north. As a result of the collision, the two cars
lock together and move in what final direction?
|6.||Which of the following are equivalent units for change in momentum?
|7.||A 1.2 kg ball moving due east at 40 m/s strikes a stationary 6.0 kg
object. The 1.2 kg ball rebounds to the west at 25 m/s. What is the speed
of the 6.0 kg object after the collision?
|8.||A 0.30 kg ball rolls off a horizontal surface as shown in the diagram.
What is the magnitude of the impulse given to the ball by gravity during
the 0.90 s it takes the ball to fall to the ground?
|9.||A ball is thrown at 15 m/s towards various barriers.
In which case does the ball experience the greatest impulse?
A. The ball hits a wall and rebounds at 2.0 m/s.
B. The ball hits a wall and rebounds at 7.0 m/s.
C. The ball hits a wall, sticks to it and stops moving.
D. The ball breaks a window and continues moving at 10 m/s in the same direction.
|10.||A small explosive device sliding to the right breaks into two pieces.
The momentum of fragment 1 after the explosion is 23 kg × m/s.
What is the momentum of fragment 2 after the explosion?
|11.||Which set of conditions is true in all inelastic
|12.||The diagram shows a collision between a 4.0 kg toy car and a stationary
8.0 kg toy truck. After the collision, the car bounces back at 1.0 m/s
while the truck goes forward at 2.0 m/s. Based on these values,
are momentum and kinetic energy conserved?
|13.||A 0.15 kg ball moving at 40 m/s is struck by a bat. The bat reverses
the ball's direction and gives it a speed of 50 m/s. What average force
does the bat apply to the ball if they are in contact for 6.0 ×10
|14.||A 0.15 kg ball rolls off a bench at 2.4 m/s as shown in the diagram
below. What is the vertical component of the ball's momentum when it strikes
the floor 0.85 m below?
|15.||The front of an automobile is designed to crumple in a collision in
order to reduce the injury to the occupants. Discuss briefly the physics
of how this design feature improves safety for the occupants. (4 marks)
|16.||A 5.20 kg block sliding at 9.40 m/s across a horizontal frictionless surface collides head on with a stationary 8.60 kg block. The 5.20 kg block rebounds at 1.80 m/s. How much kinetic energy is lost during this collision? (7 marks)|
|17.||A 4000 kg space vehicle consists of a 2500 kg main capsule and a 1500
kg probe. The space vehicle is travelling at 120 m/s when an explosion
occurs between the capsule and the probe. As a result, the probe moves
forward at 140 m/s, as shown in the diagram below.
a) What is the speed of the main capsule after the explosion? (3 marks)
b) What is the magnitude of the impulse given to the probe? (2 marks)
|18.||A 5.0 kg object travelling at 1.6 m/s collides with an object of unknown
mass m2 travelling at 2.5 m/s. The two
objects stick together and move towards the right as shown in the diagram.
Find the mass of object m2 . (7 marks)
|19.||A 3.0 kg car A travelling 8.5 m/s on a frictionless track collides
and sticks on to a stationary 2.0 kg car B.
a) The combined cars will reach what height h? (5 marks)
b) The steepness of the slope is decreased as shown below.
With this decreased slope, the combined cars will reach (circle one) (1 mark)
a) a lesser height.
b) the same height.
c) a greater height.
|20.||A 7.0 kg object moving at 12 m/s to the east explodes into two unequal
fragments. The larger 5.0 kg fragment moves at 15 m/s south.
What is the velocity (speed and direction) of the smaller 2.0 kg fragment? (7 marks)
|Top of Page||Answer Key|