C8 Force and Pressure TB FC

What effects can a force have on an object?

• A force can only make an object move.

• A force may make an object move, change speed, change direction, change shape, or cause some or all of these effects.

• A force can only change the shape of an object.

• A force has no effect on an object.

How do we prove liquids exert pressure on walls?

• By observing bulging rubber sheets on bottle sides filled with water.

• By measuring the temperature of the liquid inside the container.

• By noting the color change of the liquid when pressure is applied.

• By observing the liquid's viscosity under different conditions.

What is the gravitational force on earth called?

• Weight

• Gravity

• Mass

• Force

What is the force called when magnets attract or repel?

• Gravitational force

• Electromagnetic force

• Magnetic force

• Nuclear force

What determines the overall effect of multiple forces?

• The individual forces acting on the object

• The net force (combined effect) determines the actual result on an object.

• The mass of the object alone

• The direction of the forces only

What is atmospheric pressure?

• Pressure exerted by the air around us.

• Pressure exerted by water in oceans.

• Pressure caused by the Earth's gravity.

• Pressure from solar radiation.

Why do porters use a cloth pad on their heads?

• To increase area, thus reducing pressure on the head.

• To keep their heads warm in cold weather.

• To make it easier to carry heavier loads.

• To protect their heads from the sun.

What is friction?

• A contact force that always acts opposite to motion, slowing objects down.

• A force that always acts in the direction of motion, speeding objects up.

• A type of energy that increases with speed and decreases with mass.

• A force that only occurs between solid surfaces in contact.

Why do sharp knives cut better?

• Because they exert more pressure due to smaller area.

• Because they are made of stronger materials.

• Because they are heavier and easier to control.

• Because they have a longer blade length.

What is the unit of pressure?

• Pascal (Pa) = 1 Newton/m²

• Atmosphere (atm) = 101325 Pa

• Bar = 100000 Pa

• Torr = 133.322 Pa