Forces and Laws of Motion Test

Result

Forces and Laws of Motion Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

Identify the action that can cause motion of a book placed on a table.

A
Pulling

B
Pushing

C
Lifting

D
All of the above

Solution

The action involved in moving a book placed on a table can be pulling, pushing or lifting for which force is required.
Question 2
1 / -0

Identify the type of force involved when loaded cart is moved.

A
Lifting

B
Pulling

C
Running

D
Reading

Solution

To move a loaded cart we have to pull it . Hence action involved is as pulling.
Question 3
1 / -0

A driver accelerates his car first at the rate of $1.8 {m}/{{s}^{2}}$ and then at the rate of $1.2 {m}/{{s}^{2}}$ . The ratio of the forces exerted by the engines will be respectively equal to

A
2 : 3

B
1 : 2

C
2 : 1

D
3 : 2

Solution

Given,
$a_1=1.8\ m/s^2\\a_2=1.2\ m/s^2$

Let Mass of car is $m$ , to accelerate car with acceleration $a$ force required $F=ma$

Ratio $=\dfrac{F_1}{F_2}=\dfrac{ma_1}{ma_2}=\dfrac{1.8}{1.2}=\dfrac{3}{2}$
Question 4
1 / -0

If a cricket ball hits you, it will hurt much more than a tennis ball would, because :

A
Cricket ball is bigger

B
Cricket ball has more mass

C
Cricket ball has less density

D
None of the above

Solution

A moving balls have momentum that is equal to, $p=mv$
A ball with higher mass will have higher momentum at a constant velocity. Therefor to stop higher momentum objects, high forces are required. A cricket ball has more mass hence more momentum and will hurts more.
Question 5
1 / -0

Internal forces

A
Are always balanced

B
Are never balanced

C
May or may not be balanced

D
None of these

Solution

Internal Forces are forces between objects found inside the system. They are always balanced or their vector sum is always zero and cannot do work on the system.
Question 6
1 / -0

Identify the action involved in opening or shutting a door.

A
Pulling

B
Pushing

C
Both a and b

D
None of the above

Solution

We need to apply a PULL when trying to open a door.
We need to apply a PUSH when trying to close a door.
Question 7
1 / -0

Fill in the blanks:
A push or a pull on an object are types of ________.

A
pressure

B
attraction

C
repulsion

D
force

Solution

Force is required to move a stationary object, to stop a moving object, etc. The phenomenon required to push or to pull on object is force.
Question 8
1 / -0

Identify the action involved when a magnet attracts a piece of iron towards it.

A
Pushing

B
Pulling

C
Flying

D
Picking

Solution

When a magnet is placed near to the pieces of iron, it pulls the pieces of iron towards itself due to it's magnetic field action . So the action involved is pulling.
Question 9
1 / -0

In which of the following cases, a force is not being applied?

A
A man standing behind a stationary car.

B
A car being pushed by a man.

C
A man trying to stop a sliding car.

D
A man standing on a car.

Solution

For pushing a car, a force is required in the direction of motion of the car.
In trying to stop a sliding car, a force is required against the direction of motion of the car.
A man standing on the car applies the force of weight on the car.
But, to stand behind a stationary car, no net force needs to be applied on the car.
Option A
Question 10
1 / -0

Which of the following actions can be grouped as push?
a. A cricket ball hit by a batsman.
b. A football player kicking the ball.
c. A girl is shutting the open door of a refrigerator.

A
Only a

B
Only a and b

C
only b and c

D
a, b and c

Solution

All the above examples can be grouped as push. As the force is applied to move the object away.

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Re-Attempt Weekly Quiz Competition

Forces and Laws of Motion Test - 27

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Forces and Laws of Motion Test - 27

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Question 1

Pulling

Pushing

Lifting

All of the above

Solution

Question 2

Lifting

Pulling

Running

Reading

Solution

Question 3

2 : 3

1 : 2

2 : 1

3 : 2

Solution

Question 4

Cricket ball is bigger

Cricket ball has more mass

Cricket ball has less density

None of the above

Solution

Question 5

Are always balanced

Are never balanced

May or may not be balanced

None of these

Solution

Question 6

Pulling

Pushing

Both a and b

None of the above

Solution

Question 7

pressure

attraction

repulsion

force

Solution

Question 8

Pushing

Pulling

Flying

Picking

Solution

Question 9

A man standing behind a stationary car.

A car being pushed by a man.

A man trying to stop a sliding car.

A man standing on a car.

Solution

Question 10

Only a

Only a and b

only b and c

a, b and c

Solution

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