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HONORS PHYSICAL SCIENCE
NEWTON’S LAWS PRACTICE PROBLEMS
1. A lady pulls a cart with a force of 1372 N. Neglecting friction, if the
cart changes from resting to a speed of 1.6 m/s in a distance of
0.04646 m, what is the total mass of the cart?
2. What is the minimum force required to start a 6.6 kg box moving
across the floor if the coefficient of static friction between the box
and the floor is 0.7?
3. Somewhere between Philadelphia and the beach, when Sam
finally gets a passing lane, to get around the slower vehicle he hits
the gas and speeds up from 91.3 km/h to 121.3 km/h in 4 seconds.
What was his acceleration?
4. A police car takes off from rest, reaching a speed of 82.15 mph in
4.78 seconds. What is the average acceleration of the car?
5. To pass a slow vehicle within the length of the passing lane, Craig
got up well over the speed limit. He then spotted a police cruiser
coming around the corner and hit the brakes. If his deceleration
was 10.23 m/s2, and it took him 1.2 seconds to get back to 100
km/h, what speed had he reached before spotting the police?
6. Doug got up to 135 km/h getting around a slower vehicle within the
length of the passing lane. He then spotted a police cruiser coming
around the corner and hit the brakes, slowing to 100 km/h in 1.9
seconds. How much distance did he travel in this time?
7. What is the average speed of a sprinter who does the 100 m dash in
10.87 seconds?
8. A 4kg object is moving across a frictionless surface with a constant
velocity of 2 m/s. Determine the force necessary to maintain this
state of motion.
9. An object sits on a frictionless surface. There is a 16 N force being
applied to an object and its acceleration is at 2 m/s/s. What is its
mass?
10. A 15.0 kg mass pulled along a frictionless surface by a horizontal
force of 100 N will have what acceleration?
11. Two forces act on a body of mass of 2 kg. One is 10N North and the
other 4N South. Find resultant acceleration.
12. You decide to take your own 1550-kg car onto the test track. While
moving down the track at 10 m/s, you suddenly accelerate to 30
m/s in 10 s. What is the average net force that you have applied to
the car during the 10-s interval?
13. Why, when you release an inflated, untied balloon, does it fly across
the room?
14. A shopper in a supermarket pushes a loaded cart with a horizontal
force of 10 N. The cart has a mass of 30kg.
a. How far will it move in 3.0s, starting from rest? Ignore friction.
b. How far will it move in 3.0s if the shopper places their 30N
child in the cart before they begin to push it?
15. A load of steel of mass 6000 kg rests on a flatbed of a truck. It is held
in place by metal brackets that can exert a maximum horizontal
force of 8000 N. When the truck is traveling 20 m/s, What is the
minimum stopping distance if the load is not to slide forward?
16. If a force accelerates 4.5 kg at 40 m/s2, that same force would
accelerate 18 kg by how much?
17. A force F applied to a mass m1 produces acceleration of 3 m/s2.
The same force applied to a second mass produces acceleration
of 1.0 m/s2.
a. Find the value of the ratio m1/m2.
b. If m1 and m2 are combined find the acceleration of the
combined mass ( m1 + m2) under the action of the force, F.
18. A 0.741-kg billiard ball is given a speed of 11 m/s during a time
interval of 0.0052 s. What force acted on the ball?
19. Scientists are experimenting with a kind of gun that may eventually
be used to fire payloads directly into orbit. In one test, this gun
accelerates a 5.0 kg projectile from rest to a speed of 4.5 x 103 m/s.
The net force accelerating the projectile is 5.3 x 105 N. How much
time is required for the projectile to come up to speed?
20. A 140 kg baseball traveling 35.0 m/s strikes the catcher's mitt, which,
in bringing the ball to rest, recoils backward 11.0 cm. what was the
average force applied by the ball on the glove?
21. 1000-kg car moving north at 100km/h brakes to a stop in 50m. What
are the magnitude and direction of the force.