Force Test

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Force Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

In which of the following cases are the forces acting on the body balanced?

A
A body in free fall.

B
A car moving with a constant velocity.

C
A body in a uniform circular motion.

D
A car accelerating up a hill.

Solution

If the forces acting on a body are balanced, then the net force acting on the body will be zero and the body will either move with a constant velocity or be at rest.
Question 2
1 / -0

Two forces of 9 N and 6 N act on a body in downward direction, while another force of 15 N acts on the body in upward direction. What is the resultant of the forces?

A
15 N downwards

B
15 N upwards

C
0 N

D
30 N downwards
Question 3
1 / -0

Two children try to push a box on a rough floor. The sum of the forces applied by both of them is 7 N and the force of friction is 3N. Based on that, which of the following statements is correct?

A
The box will move in the direction of the force of friction.

B
The box will move in the direction of the force applied by the children.

C
The box will not move.

D
The resultant force on the box will be10 N.

Solution

As the total force applied by the children is greater than the opposing (friction) force, the box will move in the direction of the force applied by the children.
Net force = 7 N - 3 N = 4 N
Question 4
1 / -0

A body of mass 200 g is resting on a frictionless table. What is the acceleration of the body, when it is acted upon by a force of 0.05 N?

A
2.5 ms^-2

B
0.25 ms^-2

C
10 ms^-2

D
1 ms^-2
Question 5
1 / -0

A ball of mass 20 g is initially moving with a velocity of 25 ms^-1. On applying a constant force on the ball for 2 s, it acquires a velocity of 65 ms^-1. What is the magnitude of the force applied?

A
0.4 N

B
0.2 N

C
400 N

D
20 N
Question 6
1 / -0

On applying a force of 2 N on masses m₁ and m₂_,it produces acceleration of 5 ms^-2 and 10 ms^-2, respectively. Calculate the acceleration, when both the masses are tied together.

A
15 ms^-2

B
3.3 ms^-2

C
5 ms^-2

D
0.6 ms^-2
Question 7
1 / -0

A force F1 is required for accelerating a 3 kg mass accelerating at the rate of ms-2 and a force F2 for a 6 kg mass at the rate of 2 ms-2.
Choose the correct option.

A
F₁ > F₂

B
F₂ > F₁

C
F₁ = F₂

D
F₂≥ F₁
Question 8
1 / -0

A force `F` is required to accelerate a body of mass `m` at 10 ms^-2. What is the force required to accelerate a body of mass `2m` at the rate of 20 ms^-2?

A
2F

B
F

C
4F

D
40F
Question 9
1 / -0

When a bus suddenly starts, a person standing in it will

A
fall backwards

B
fall forward

C
stand straight

D
feel a sudden jerk
Question 10
1 / -0

In the case of motors and lorries moving along a bend, the centripetal force is provided by

A
the gravitational attraction between the motors/lorries and the earth.

B
the friction between the road and tyres of the wheel.

C
the reaction of the ground on the motor/lorry.

D
the kinetic energy of the motor or lorry.

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Force Test - 3

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Force Test - 3

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Question 1

A body in free fall.

A car moving with a constant velocity.

A body in a uniform circular motion.

A car accelerating up a hill.

Solution

Question 2

15 N downwards

15 N upwards

0 N

30 N downwards

Question 3

The box will move in the direction of the force of friction.

The box will move in the direction of the force applied by the children.

The box will not move.

The resultant force on the box will be10 N.

Solution

Question 4

2.5 ms-2

0.25 ms-2

10 ms-2

1 ms-2

Question 5

0.4 N

0.2 N

400 N

20 N

Question 6

15 ms-2

3.3 ms-2

5 ms-2

0.6 ms-2

Question 7

F1 > F2

F2 > F1

F1 = F2

F2 ≥ F1

Question 8

2F

F

4F

40F

Question 9

fall backwards

fall forward

stand straight

feel a sudden jerk

Question 10

the gravitational attraction between the motors/lorries and the earth.

the friction between the road and tyres of the wheel.

the reaction of the ground on the motor/lorry.

the kinetic energy of the motor or lorry.

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2.5 ms^-2

0.25 ms^-2

10 ms^-2

1 ms^-2

15 ms^-2

3.3 ms^-2

5 ms^-2

0.6 ms^-2

F₁ > F₂

F₂ > F₁

F₁ = F₂

F₂≥ F₁