1. A force of 10 N is used to pull a 2.3 kg block along a horizontal surface with a coefficient of friction of 0.25. a) Find the unbalanced force. b) Find the acceleration.

2.A 6.0 kg mass is pulled along a horizontal surface where the coefficient of friction is 0.20.

a) What is the friction force acting on the mass? b) What force is needed to accelerate it at 0.68 m/s2?

3.. A 15 kg box is given an initial push so that it slides across the floor and comes to a stop. If the coefficient of friction is 0.30, a) find the friction force. b) find the acceleration of the box. c) how far will the box go if its initial speed is 3.0 m/s?

4what is the weight of a 750 kg Volkswagen:

a)on the Earth's surface?

b)on Mars, where g = 3.3 N/kg

5.If a net force of 6.0 N acts on a 4.0 kg mass, what is its acceleration?

6.Referring to worksheet 1 of this section, determine the following:

a)

from question 1:

i) the mass of the 20 N wagon.

ii) the acceleration of the wagon.

b)

from question 2:

i) the mass of Hayley + motorcycle.

ii) the acceleration of bike and rider

7.An elevator of mass 890 kg has an upward force of 1.10 x 10

N applied to it. Determine the following

a) the net force on the elevator.

b) the acceleration of the elevator

8.In a competition, a small robot accelerates forward at 0.25 m/s as it pushes a wood

block of mass 1.6 kg towards a basket.

A friction force of 3.7 N exists between

the block and floor.A friction force of 3.7 N exists between

the block and floor

a) what is the net force acting on the block?

b)what force is the robot applying to accelarate the block

9.A hoist is used to lift a 780 kg car upward with an acceleration of 0.110 m/s2

a)what is net force acting on the car?

b)what force we used to lift the car

10.A force of 10 N is used to pull a 2.3 kg block along a horizontal surface with a coefficient

of friction of 0.25.

a)Find the unbalanced force

b)Find the acceleration

11.A 6.0 kg mass is pulled along a horizontal surface where the coefficient of friction is 0.20

a)What is the friction force acting on the mass?

b)What force is needed to accelerate it at 0.68 m/s2

c)how far will the box go if its initial speed is 3.0 m/s?

12.Challenge) In an experiment, an electric

motor is used to pull an unknown mass 'm"

directly upward. By repeating the experiment,

students measure the average tension on the

cable as 16.7 N, and an upward acceleration

of the mass as 0.40 m/s2

what is mangnitude of the mass "m"