TV3 Ch02 Forces

• Natuurkunde
• Middelbare school
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• Leerjaar 3

Ch02 Forces

The unit of force is

1. Joule
2. Newton
3. Isaacs
4. meter per second

The force upwards on objects under water is called:

1. The upward force
2. The upthrust force
3. The floating force
4. The anti-gravity force

The definition of force is:

1. An energetic motion
2. A change of direction
3. A newtonian motion
4. A push or a pull

The force of gravity on a kitten of 0.5 kg is closest to:

1. 0.5 N
2. 1.0 N
3. 4.8 N
4. 5.2 N

When the scale is 1 cm = 4 N,
a 3 cm vector represents:

1. 1/4 N
2. 4 N
3. 1,2 N
4. 12 N

The official name for the final force is:

1. The sum force
2. The result force
3. The resultant force
4. The final force

If a force of 45 N to the right, and a force of 24 N to the left are exerted on Tom, the resultant force is:

1. 69 N to the right
2. 69 N to the left
3. 21 N to the right
4. 21 N to the left

The 'C' in the formula F=C times x stands for:

1. extension
2. resultant force
3. length of spring
4. spring constant

A high value for the spring constant means:

1. the spring is very long
2. the spring is very short
3. the spring is very flexible
4. the spring is very stiff

The first thing to do, when you have to sketch and calculate a resultant force,
is:

1. indicate what is the positive direction
2. measure the length of the vector
3. subtract the forces
4. add the forces

Newton's first law says: If the resultant force of all forces working on an object is zero, then . . .

1. the object is stationary
2. the object is stationary or has constant velocity
3. the object has constant velocity
4. the object will decellerate

The three main resistive forces are:

1. upthrust, friction and drag
2. force of gravity, friction and rolling resistance
3. force of gravity, air resistance and rolling resistance
4. air resistance, friction and rolling resistance

In space, ...

1. there is zero resistive force
2. there is very little resistive force
3. there is a substantial resistive force
4. the only resistive force is due to gravity

means:

​.​∑​.​​F

1. The sum of all forces
2. The sum of all resistive forces
3. The resultant force
4. The largest force

The word 'acceleration' in Newton's second law ..

1. refers to an increasing speed
2. refers to a decreasing speed
3. refers to a change of direction
4. can refer to any of the above