Physics Homework [Forces 1]

Question 1

Give three examples of scalar quantities.

Answer 1

Energy, time, mass, distance, speed.

Question 2

Define contact force.

Answer 2

When two interacting objects have to physically touch to interact.

Question 3

Give three examples of vector quantities.

Answer 3

Force, displacement, velocity, momentum.

Question 4

State how a vector is represented on a diagram.

Answer 4

With an arrow.

Question 5

Give three examples of non-contact forces.

Answer 5

Gravitational force (weight), electrostatic force, magnetic force.

Question 6

Define vector quantity.

Answer 6

Something measure that has both a magnitude and direction.

Question 7

If two forces act in the same direction, describe how the size of the resultant force is calculated.

Answer 7

The size of the resultant force will be the sum of the two individual forces.

Question 8

If two forces act in the same direction, describe how the direction of the resultant force is established.

Answer 8

The direction of the resultant force will be in the same direction as the two individual forces.

Question 9

Explain why vectors are represented as arrows.

Answer 9

They have both a magnitude and direction.

Question 10

If the forces on an object are balanced, give the resultant force.

Answer 10

0N

Question 11

State the standard units for weight.

Answer 11

Newtons (N)

Question 12

State the standard units for mass.

Answer 12

Kilograms (kg)

Question 13

Define scalar quantity.

Answer 13

Something measured that only has a magnitude.

Question 14

Define non-contact force.

Answer 14

When two interacting objects do not have to physically touch to interact.

Question 15

If two forces on an object act in opposite directions, describe how the size of the resultant force is calculated.

Answer 15

By subtracting the forces from each other.

Question 16

If two forces act in opposite directions and one force is larger, describe how the direction of the resultant force is established.

Answer 16

It will be the direction of the larger magnitude force.

Question 17

What causes forces?

Answer 17

An interaction between two objects.

Question 18

Define resultant force.

Answer 18

The single force that has the same effect as all the individual forces on an object acting together.

Question 19

Give three examples of contact forces.

Answer 19

Friction, air resistance, tension, normal contact force.

Question 20

Describe how a resultant force is calculated.

Answer 20

By adding all the individual forces on an object as vectors.