Free Printable forces review penner

1.

A block is pushed along a horizontal, frictionless surface with horizontal force that varies with time as shown. At time t=3 seconds, the acceleration of the block is 5.0 m/s/s. The mass of the block is

a)

1 kg

b)

2 kg

c)

3 kg

d)

5 kg

e)

15 kg

2.

The free-body diagram shows all of the forces acting on a box on a level surface. Which statement is correct?

a)

The box must be moving to the left

b)

The box must be accelerating to the right

c)

The box must be moving to the right

d)

The diagram must be drawn incorrectly

3.

If the object in this picture is in equilibrium, What is the force of friction?

a)

0

b)

12

c)

8

d)

4

4.

A person stands on a scale while riding an elevator. In phase 1, the elevator is at rest. The person has a mass of about:

a)

560 kg

b)

56 kg

c)

5.6 kg

d)

560 g

5.

A person stands on a scale while riding an elevator. In phase 1, the elevator is at rest. The elevator is traveling

a)

upwards

b)

downwards

c)

cannot determine

6.

A mass is pulled with an ever-increasing force until it slips and begins to slide at a constant speed. A force/time graph is plotted as shown. If the mass is 240 g, the coefficient of kinetic friction is about

a)

0.08

b)

0.16

c)

0.24

d)

0.32

7.

A curved groove is place on the top of a level table as shown in the diagram. A ball is pushed in the groove at P so that it leaves at Q. Which picture shows how the ball will move when it leaves the groove at Q?

a)

b)

c)

d)

8.

The mass of the cart is

a)

1.2 kg

b)

5.0 kg

c)

6.6 kg

d)

7.2 kg

9.

A block of mass m accelerates down a rough incline as shown. The acceleration of the mass is

a)

$mg\sin\theta-mg\cos\theta$

b)

$mg\sin\theta-\mu mg\cos\theta$

c)

$mg\sin\theta-\mu mg$

d)

$g\sin\theta-g\cos\theta$

e)

$g\sin\theta-\mu g\cos\theta$

10.

Two masses, M>m, are connected by a light string hanging over a pulley. When they are released, the acceleration of the masses is:

a)

$\left(\frac{M+m}{M-m}\right)g$

b)

$\left(\frac{M-m}{M+m}\right)g$

c)

$\left(\frac{M}{M+m}\right)g$

d)

$\left(\frac{m}{M+m}\right)g$

e)

$\left(\frac{M-m}{M}\right)g$

11.

A force is applied to a pair of unconnected objects of mass 4m and 3m, resting on a horizontal, frictionless surface. What is the magnitude of the force between the two masses?

a)

Fapplied

b)

2Fapplied

c)

3/4 Fapplied

d)

3/7 Fapplied

e)

4/7 Fapplied

12.

A 10 kg mass is suspended from a cable A and a light rigid bar B. What is the approximate tension in cable A?

a)

58 N

b)

173 N

c)

141 N

d)

246 N

e)

115 N

13.

a)

The acceleration of the blocks will vary according to their mass

b)

The acceleration of each block will be the same: F/m

c)

The net force acting on each block is the same

d)

The magnitude of the force on block 3m from 2m is greater than the magnitude of the force back on 2m from 3m

e)

The net force acting on block 3m is three times greater than the net force acting on m

14.

If m1 = 3 kg and m2 = 2 kg, when the masses are released, the acceleration is approximately:

a)

1 m/s/s

b)

2 m/s/s

c)

4 m/s/s

d)

6 m/s/s

e)

8 m/s/s

15.

a)

$\frac{mg}{F\sin\phi}$

b)

$\frac{f}{F\sin\phi+mg}$

c)

$\frac{f}{mg}$

d)

$\frac{mg}{f}$

e)

$\frac{f}{F\sin\phi-mg}$

forces review penner

Total questions: 15

Worksheet time: 24mins

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