280

Physics Force & Laws Of Motion Level: High School

A newton is the force :

a) of gravity on a 1 kg body

b) of gravity on a 1 g body

c) that gives a 1g body an acceleration of 1 cm/s^2

d) that gives a 1 kg body an acceleration of 1m/s^2

e) that gives a 1 kg body an acceleration of 9.8 m/s^2

Ans:(d) that gives a 1 kg body an acceleration of 1 m/s^2

279

Physics Force & Laws Of Motion Level: High School

An example of an internal reference frame is :

a) any frame that is not accelerating

b) a frame attached to a particle on which no forces act.

c) any frame that is at rest.

d) a frame attached to the centre of the universe.

e) a frame attached to the earth.

Ans:(a) any frame that is not accelerating

276

Physics Force & Laws Of Motion Level: High School

If you know the impulse that has acted on a body of mass m you can calculate ,

a) its initial velocity

b) its final velocity

c) its final momentum

d) the change in its velocity

e) the acceleration during the impulse


275

Physics Force & Laws Of Motion Level: High School

A car of mass m1 traveling at velocity V passes a car of mass m2 parked at the side of the road . The momentum of the system of the two cars are

a) 0

b) (m1)*V

c) (m1-m2)*V

d) (m1)*V/(m1+m2)

e) (m1+m2)*V

Momentum of the system of two cars = (m1)* V + O = (m1)V So answer is 'b'

202

Physics Force & Laws Of Motion Level: High School

Two boxes , ml = 1.0 kg with a coefficient of kinetic friction of 0.10 , and m2 = 2.0 kg with a coefficient of 0.20 , are placed on a Plane inclined at theta = 30 degrees .

(a)what acceleration does each block experience ?

(b) if a taut string is connected to the blocks, with m2 initially farther down the slope , what is the acceleration of each block ?

(c) if the initial configuration is reversed with ml starting lower with a taut string , what is the acceleration of each block ?


201

Physics Force & Laws Of Motion Level: High School

A 75 kg person stands on a scale in an elevator . What does the scale read ( in N and kg) when the elevator is

(a) at rest

(b) ascending at constant speed of 3.0 m/s

(c) falling at 3.0 m/s

(d) accelerating upward at 3.0 m/s2 (s2 means a square)

(e) accelerating downward at 3.0 m/s2 (s2 means a square)


200

Physics Force & Laws Of Motion Level: High School

A ski slope is 1.2 kilometers long and is inclined at 13 degrees from the horizontal . A person begins at the top of the slope (assumed to be smooth) and accelerates down wards . Find the time it takes for the person to travel to slope .

199

Physics Force & Laws Of Motion Level: High School

A child is pushing a box of mass 6 kg up a smooth inclined plane which is at an angle 17 degrees to the horizontal . The box is pushed parallel to the plane , and its acceleration is 0.7 m/s2 . Find the force between the plane and the box .

198

Physics Force & Laws Of Motion Level: High School

A ball of mass 1.6 kilogram is projected with a velocity 19.5 m/s in a direction 30.7 degrees from the horizontal . The acceleration due to gravity is g = 9.81 m/s2 . What is the force acting on the ball the moment it is projected (in Newton's) ?
The moment it is projected , the only force acting on it is the gravitational force in the downward direction . F = mg = 1.6 x 9.81 = 15.696 N.

197

Physics Force & Laws Of Motion Level: High School

A bucket of water which weighs 10.7 Newton's is pulled vertically using two forces . The first of magnitude 8.6 Newton's acts at an angle 59 degrees from the vertical . The second acts at an angle 18 degrees from the vertical . Find the net force acting on the bucket (due to the forces and the weight) in Newton's

196

Physics Force & Laws Of Motion Level: High School

A child is pulling a box of mass 3.7 kg , along a smooth horizontal surface using a rope tide to it . The rope bears an angle 14.62 degrees above the horizontal . If the velocity of the box is 14.93 m/s and its acceleration is 0.2 m/s2 find the force between the box and the floor ( g = 9.81 m/s2

182

Physics Force & Laws Of Motion Level: High School

A child pulls a friend in a little red wagon with constant speed . If the child pulls with a force of 16 N for 14.3 m , and the handle of the wagon is inclined at an angle of 29 degree above the horizontal , how much work does the child do on the wagon ?

181

Physics Force & Laws Of Motion Level: High School

A child pulls a friend in a little red wagon with constant speed . If the child pulls with a force of 16 N for 14.3 m , and the handle of the wagon is inclined at an angle of 29 degree above the horizontal , how much work does the child do on the wagon ?

180

Physics Force & Laws Of Motion Level: High School

After a tornado , a 0.60 g straw was found embedded 2.9 cm into the trunk of a tree . If the average force exerted on the straw by the tree was 60 N , What was the speed of the straw when it hit the tree ?

176

Physics Force & Laws Of Motion Level: High School

After a tornado , a 0.60 g straw was found embedded 2.9 cm into the trunk of a tree . If the average force exerted on the straw by the tree was 60 N , What was the speed of the straw when it hit the tree ?

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