4 Newton's Laws of Motion - BC Science Physics 11

Chapter 4 Extra Practice
1. What is the difference between inertial mass and
gravitational mass?
2. Describe three factors related to inertia that explain
why an oil tanker ship is harder to maneuver when it
is full than when it is empty.
3. Use Newton’s laws to explain why a headrest in a car
protects the neck of the person in a car.
4. Some older model trucks did not have headrests.
Why could this be a safety hazard for passengers in
the truck?
5. How can you use Newton’s first law of motion to
explain why shooting a hockey puck across a frozen
pond will travel a long way?
6. In a car collision seat belts are a safety device to
protect you. Should pets in a car wear a seat belt?
Use Newton’s first law of motion to defend you
position.
7. Using only units and Newton’s second law of
motion, prove that the unit for force can be
kg•m/s 2 .
8. What unbalanced force is needed to push a 35 kg
girl in a 20 kg wagon at an acceleration of 1.0 m/s 2 ?
9. What force is needed to move a 270 N kindergarten
student learning to skate at an acceleration of
0.7 m/s 2 ?
10. Rhys and Gareth are having a tug of war with
1.25 kg of climbing rope. If Rhys pulls with a force of
24 N and the rope accelerates away from him at
1.4 m/s 2 , with what force is Gareth pulling the rope?
11 A 70 kg person is standing on a bathroom scale in an
elevator purely for scientific purposes. The elevator
begins to accelerate upward at 2.25 m/s 2 for 1.75 s
and then continues at a constant speed. What is the
reading on the scale or weight of the person when
the elevator is at rest and when it is accelerating?
12. A 400 g air track glider has an initial velocity of
0.50 m/s. A force of 0.60 N is applied in the opposite
direction. How long will it take to bring the glider to
a stop?
13. Owen is standing against the boards in a skating
rink with his skates on. He pushes against the
boards. What direction will he go?
14. If Owen is 40 kg, and pushes with a force of 15 N,
what will be his acceleration?
15. A 2100 kg sports car is approaching a stop sign. If
the acceleration rate to slow down is –4.5 m/s 2 , what
is the net force slowing the car down?
16. A plastic bag at a local store can hold a maximum
of 275 N before it rips. When lifted, the bag reaches
a maximum acceleration of 6.0 m/s 2 . What is the
maximum mass that can be put into the bag?
17. (a) A racing car can reach a speed of 100 km/h in
1.95 s. If the car is 689 kg and the driver has a
weight of 833 N, what is the average acceleration
of the car?
(b) On a drag strip track of 350 m, the racing car
completes the distance in 4.67 s. If acceleration
is constant, what is the average acceleration and
final velocity?
18. What is the acceleration of a 130 g baseball traveling
at 25 m/s when it is caught in a glove and brought
to rest in 0.05 s?
130 Chapter 4 Newton’s Laws of Motion © Edvantage Interactive 2012 ISBN 978-0-9864778-3-6