Question

state if the following statements are true or false a.force cannot act on an object without being in contact with it. b. a physical balance is used to measure force. c. a wooden block slides more easily on a smooth cemented floor then on rollers d. a force that acts on an object never changes its shape. e. the contact force can act through a distance. f. while sitting in a car, you are in continuous motion with regards to the driver. g. missiles are streamlined in shape to increase the force of friction​

Answer 1

Answer:

(a) True (b) True (c) False (d) False (e) False (f) False (g) False

Explanation:

(a) True

a force has to be in contact with the object if it wants to move or stop the motion of the object or to change it's shape.

(b) True

A physical balance can be used to measure the force of gravitation of the body due to earth which is called it's weight.

(c) False

Rolling friction is less than the sliding friction.

(d) False

(e) False

A contact force must be in the contact with the body in order to act on it.

(f) False

while your sitting in the car you are in continuous motion with respect to the people outside the bus and not the driver.

(g) False

missiles are made streamlined in shape in order to reduce the force of friction.

Answer 2

Answer: false

Explanation: because wooden block isi static friction and roller is in rolling friction and roling friction is less than static friction