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F=ma
Test Description: Newtons 2nd Law
Instructions: Answer all questions to get your test result.
1) A worker is moving a large crate (mass = 250kg). Once it is moving it accelerates at .22 m/sec^2〖North.〗 The worker is able to apply 325 N of force, what is the frictional force between the crate and the floor?
A
380 N
B
270 N
2) Zack is pushing a huge rock (mass=125kg) in his yard. Once it is moving it accelerates at .13 m/sec^2〖East.〗 Zack is able to apply 55 N of force, what is the frictional force between the rock and the ground?
A
71.25 N
B
38.75 N
3) A little boy pushes a wagon with his dog in it. The mass of the dog and wagon together is 45 kg. The wagon accelerates at 0.85 m/s2. What force is the boy pulling with?
A
38.25 N
B
52.9 N
C
.0189 N
4) A tennis ball, 0.654 kg, is accelerated at a rate of 155 m/s2 when hit by a professional tennis player. What force does the player's tennis racket exert on the ball?
A
101.4 N
B
.0042 N
C
237 N
5) 3 women push a stalled car. Each woman pushes with a 44 N force. What is the mass of the car if the car accelerates at 0.2 m/s2?
A
8.8 kg
B
26.4 kg
C
660 kg
D
220kg
6) A crate is dragged across an ice covered lake. The box accelerates at 0.87 m/s2 and is pulled by a 100 N force. What is the mass of the box?
A
.0087 m/s2
B
87 m/s2
C
114.9 m/s2
7) 14. A 100 kg runner exerts a force of 90 N. What is the acceleration of the runner?
A
.9 m/s2
B
9000 m/s2
C
1.11 m/s2
8) A child pushes her toy with a force of 5 Newtons. The toy accelerates to .05 meters/sec^2. What is the mass of the toy?
A
.01 kg
B
.25 kg
C
100 kg
9) A woman pushes a box (mass: 33 kilograms). The static friction between the box and the ground is 27 Newtons, while the kinetic friction is 9 Newtons. With what force must she push the box in order to get it to accelerate at 1.2 m/s2 to the north?
A
48.6 N
B
9.03 N
C
18.5 N
10) A woman pushes a box (mass: 33 kilograms). The static friction between the box and the ground is 27 Newtons, while the kinetic friction is 9 Newtons. With what force must she push the box in order to get it moving?
A
a little more than 9 N
B
a little more than 27 N
*select an answer for all questions
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