Ch. 5 Forces (Unit 3)

Front

What is the formula to calculate weight?

Back

Weight = mass × gravity (W = m × g)

Front

What is the weight of a 20 kg object on Earth?

Back

196 N (Weight = 20 kg × 9.8 N/kg)

Front

Define static friction.

Back

Static friction is the force that keeps an object at rest and prevents it from moving.

Front

What type of friction acts on moving objects?

Back

Kinetic friction.

Front

What is net force?

Back

Net force is the total force acting on an object, taking into account all the individual forces.

Front

If an object has a net force of 17 N to the right, what can be inferred about the forces acting on it?

Back

The forces acting to the right are greater than those acting to the left by 17 N.

Front

What does it mean for an object to accelerate?

Back

Acceleration means that the object's velocity is changing, which can be an increase or decrease in speed or a change in direction.

Front

What is the role of friction when pushing an object?

Back

Friction opposes the motion of the object and can affect how much force is needed to push it.

Front

If a refrigerator is pushed with a force of 4000 N and the friction force is 1354 N, what is the net force?

Back

Net force = applied force - friction force = 4000 N - 1354 N = 2646 N.

Front

What is the difference between static and kinetic friction?

Back

Static friction acts on objects at rest, while kinetic friction acts on objects in motion.