Forces

The easiest way to describe a force would be

• A push or pull on an object
• The speed of an object
• The weight of an object
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A mathematical formula to describe a force acting on an object would be

• f = (mv²)/2

• f = mv

• p = mv

• f = ma

What would be the force acting on an object of 5kg mass and accelerating at 2ms^-2 .

A weather balloon with 5.5kg of mass has a buoyancy force of 60N when full. What would be the resultant force on the balloon.

• 50 N upwards

• 5 N downwards

• 60 N upwards

• 5 N upwards

A car with a mass of 1800 kg slams on it's brakes, causing a negative acceleration of 2ms^-2. What would the force being applied by the brakes be?

• 3600 kN

• 900 N

• 3.6 kN

• 0.36 MN

How much force would be required to accelerate a 600g basketball 5ms^-2.

While sky diving, this kitty with a weight of 5N opens their parachute, after a few seconds, the air resistance reaches 5N. The speed of the kitty's fall is 2 ms^-1. What would the speed of the fall be after one minute.

• It will be a constant speed, but not enough information to calculate it.

• It will be a constant speed of 102ms^-1.

• It will be a constant speed of 2 ms^-1.

• One minute is too long, kitty would already be on the ground.

If you applied 5 Newtons of force to a 5g ping pong ball and to a 5kg bowling ball, which ball would accelerate more rapidly?

• bowling ball

• ping pong ball

• they would be the same.

• GOAL!!!

When this cat sits on a physics scale, it reads 45 Newtons. If we take the pull of gravity to be about 10 N/kg, what would the mass of the cat be?

A submarine has a buoyancy force of 1,200,000,000 N. It wants to sink below the surface. What would it need to do?

• Reduce the buoyancy force to less than the weight force.

• Increase the weight force to be greater than the buoyancy force.

• Open the doors of the submarine under the water.

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